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Timeline of the 2025 Pacific hurricane season

The 2025 Pacific hurricane season was an active Pacific hurricane season, with an above average number of tropical cyclones occurring east of the International Date Line (IDL) in the Northern Hemisphere. It officially began on May 15 in the eastern Pacific (east of 140°W), and on June 1 in the central Pacific (from the IDL east to 140°W); it will end in both on November 30. These dates, adopted by convention, historically describe the period in each year when most tropical cyclogenesis occurs in these regions of the Pacific. The season's first system, Tropical Storm Alvin, developed on May 28. The last storm of the season, Tropical Storm Sonia, dissipated on October 28, with no further storms forming in November.

This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. It includes information that was not released throughout the season, meaning that data from post-storm reviews by the National Hurricane Center, such as a storm that was not initially warned upon, has been included.

The time stamp for each event is first stated using Coordinated Universal Time (UTC), the 24-hour clock where 00:00 = midnight UTC. The NHC uses both UTC and the time zone where the center of the tropical cyclone is currently located. The time zones utilized (east to west) are: Central, Mountain, Pacific and Hawaii. In this timeline, the respective area time is included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (miles, or kilometers), following National Hurricane Center practice. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury.

Timeline

May

May 15

  • The Eastern Pacific hurricane season officially begins.

May 28

  • 18:00 UTC (12:00 p.m. CST) at Tropical Depression OneE forms from a large disturbance along the eastern North Pacific monsoon trough, about southwest of Acapulco, Guerrero.

May 29

  • 12:00 UTC (5:00 a.m. MST) at Tropical Depression OneE strengthens into Tropical Storm Alvin.
  • 18:00 UTC (11:00 a.m. MST) at Tropical Storm Alvin attains its peak intensity, with maximum sustained winds of and a minimum central pressure of .

May 31

  • 06:00 UTC (11:00 p.m. MST, May 30) at Tropical Storm Alvin degenerates into a remnant low, and later dissipates.

June

June 1

  • The Central Pacific hurricane season officially begins.

June 8

  • 06:00 UTC (00:00 a.m. CST) at Tropical Storm Barbara forms from a disturbance along the eastern North Pacific monsoon trough, about offshore the coast of Guerrero.
  • 06:00 UTC (11:00 p.m. MST, June 7) at Tropical Depression ThreeE forms from a broad area of low pressure located within the eastern North Pacific monsoon trough.
  • 12:00 UTC (5:00 a.m. MST) at Tropical Depression ThreeE strengthens into Tropical Storm Cosme.

June 9

  • 06:00 UTC (11:00 p.m. MST, June 8) at Tropical Storm Barbara strengthens into a Category 1 hurricane and simultaneously attains its peak intensity, with maximum sustained winds of and a minimum central pressure of .
  • 18:00 UTC (11:00 a.m. MST) at Tropical Storm Cosme attains its peak intensity, with maximum sustained winds of and a minimum central pressure of .

June 10

  • 00:00 UTC (5:00 p.m. MST June 9) at Hurricane Barbara weakens to a tropical storm.
  • 18:00 UTC (11:00 a.m. MST) at Tropical Storm Barbara degenerates to a remnant low, and later dissipates.

June 11

  • 06:00 UTC (11:00 p.m. MST, June 10) at Tropical Storm Cosme degenerates to a remnant low, and later dissipates.

June 13

  • 12:00 UTC (6:00 a.m. CST) at Tropical Depression FourE forms from a tropical wave about south of Zihuatanejo, Guerrero.
  • 18:00 UTC (12:00 p.m. CST) at Tropical Depression FourE strengthens into Tropical Storm Dalila.

June 14

  • 18:00 UTC (12:00 p.m. CST) at Tropical Storm Dalila attains its peak intensity, with maximum sustained winds of and a minimum central pressure of about south of Manzanillo, Colima.

June 16

  • 00:00 UTC (5:00 p.m. MST, June 15) at Tropical Storm Dalila degenerates into a remnant low, and subsequently dissipates far southwest of the southern tip of Baja California Sur.

June 17

  • 00:00 UTC (6:00 p.m. CST, June 16) at Tropical Depression FiveE forms from a tropical wave.
  • 12:00 UTC (6:00 a.m. CST) at Tropical Depression FiveE strengthens into Tropical Storm Erick.

June 18

  • 06:00 UTC (12:00 a.m. CST) at Tropical Storm Erick strengthens into a Category 1 hurricane about south of Salina Cruz, Oaxaca.
  • 18:00 UTC (12:00 p.m. CST) at Hurricane Erick intensifies to Category 2 strength about 105 mi (165 km) south of Puerto Ángel, Oaxaca.

June 19

  • 00:00 UTC (6:00 p.m. CST June 18) at Hurricane Erick intensifies to Category 3 strength about south of Puerto Ángel.
  • 06:00 UTC (12:00 a.m. CST) at Hurricane Erick intensifies to Category 4 strength and simultaneously attains its peak intensity, with maximum sustained winds of and a minimum central pressure of about west-southwest of Puerto Ángel.
  • 11:30 UTC (5:30 a.m. CST) at Hurricane Erick weakens to Category 3 strength and simultaneously makes landfall in Santo Domingo Armenta, Oaxaca, with sustained winds of .
  • 18:00 UTC (12:00 p.m. CST) at Hurricane Erick rapidly weakens to Category 1 strength inland.

June 20

  • 00:00 UTC (6:00 p.m. CST, June 19) at Hurricane Erick weakens into a tropical depression over the region's rugged terrain, and soon dissipates.

June 29

  • 06:00 UTC (0:00 a.m. CST) at Tropical Depression SixE forms from a tropical wave about south of Acapulco, Guerrero.
  • 18:00 UTC (12:00 p.m. CST) at Tropical Depression SixE strengthens into Tropical Storm Flossie about south of Acapulco.

July

July 1

  • 00:00 UTC (6:00 p.m. CST, June 30) at Tropical Storm Flossie strengthens into a Category 1 hurricane about south of Manzanillo, Colima.
  • 18:00 UTC (12:00 p.m. CST) at Hurricane Flossie intensifies to Category 2 strength about southwest of Manzanillo.

July 2

  • 00:00 UTC (5:00 p.m. MST, July 1) at Hurricane Flossie intensifies to Category 3 strength about southwest of Manzanillo.
  • 03:00 UTC (8:00 p.m. MST, July 1) at Hurricane Flossie attains its peak intensity, with maximum sustained winds of and a minimum central pressure of about west of Manzanillo.
  • 12:00 UTC (5:00 a.m. MST) at Hurricane Flossie weakens to Category 2 strength about west of Manzanillo.

July 3

  • 00:00 UTC (5:00 p.m. MST, July 2) at Hurricane Flossie weakens to Category 1 strength about west of Manzanillo.
  • 06:00 UTC (11:00 p.m. MST, July 2) at Hurricane Flossie weakens to a tropical storm about west of Manzanillo.
  • 12:00 UTC (5:00 a.m. MST) at Tropical Storm Flossie degenerates into a remnant low about west of Manzanillo, and subsequently dissipates.

July 27

  • 00:00 UTC (2:00 p.m. HST, July 26) at Tropical Depression OneC forms from a low-latitude tropical wave about southeast of Hilo, Hawaii.
  • 18:00 UTC (8:00 a.m. HST) at Tropical Depression OneC strengthens into Tropical Storm Iona.

July 28

  • 12:00 UTC (2:00 a.m. HST) at Tropical Depression Two-C forms from a low-latitude low-pressure area about southeast of Hilo, Hawaii.
  • 18:00 UTC (8:00 a.m. HST) at Tropical Storm Iona strengthens into a Category 1 hurricane.
  • 18:00 UTC (8:00 a.m. HST) at Tropical Depression TwoC strengthens into Tropical Storm Keli.

July 29

  • 06:00 UTC (8:00 p.m. HST, July 28) at Hurricane Iona rapidly intensifies to Category 3 strength.
  • 06:00 UTC (8:00 p.m. HST, July 28) at Tropical Storm Keli attains its peak intensity, with maximum sustained winds of and minimum central pressure of , about southeast of Hilo.
  • 12:00 UTC (2:00 a.m. HST) at Hurricane Iona intensifies to Category 4 strength, and simultaneously attains its peak intensity with maximum sustained winds of and minimum central pressure of , about south of Hilo.
  • 18:00 UTC (8:00 a.m. HST) at Hurricane Iona weakens to Category 3 strength about south of Hilo.
  • 18:00 UTC (8:00 a.m. HST) at Tropical Storm Keli dissipates about south of Hilo due to interaction with Hurricane Iona to its west and a larger disturbance to its east.

July 30

  • 06:00 UTC (8:00 p.m. HST July 29) at Hurricane Iona weakens to Category 2 strength.
  • 12:00 UTC (2:00 a.m. HST) at Hurricane Iona weakens to Category 1 strength.
  • 18:00 UTC (8:00 a.m. HST) at Hurricane Iona weakens to a tropical storm.

July 31

  • 00:00 UTC (2:00 p.m. HST, July 30) at Tropical Storm Gil forms about south-southwest of the southern tip of the Baja California peninsula.

August

August 1

  • 06:00 UTC (8:00 p.m. HST, July 31) at Tropical Storm Iona weakens to a tropical depression about east of the International Date Line, and later dissipates while still within the Central Pacific basin.

August 2

  • 00:00 UTC (2:00 p.m. HST, August 1) at Tropical Storm Gil strengthens into a Category 1 hurricane, and simultaneously attains its peak intensity, with maximum sustained winds of and minimum central pressure of , about southwest of the southern tip of the Baja California peninsula.
  • 18:00 UTC (8:00 a.m. HST) at Hurricane Gil weakens to a tropical storm.

August 3

  • 12:00 UTC (2:00 a.m. HST) at Tropical Storm Gil degenerates into a remnant low, and subsequently dissipates.

August 4

  • 06:00 UTC (8:00 p.m. HST, August 3) at Tropical Depression EightE forms from a tropical wave about southwest of the Baja California peninsula.
  • 12:00 UTC (2:00 a.m. HST) at Tropical Depression EightE strengthens into Tropical Storm Henriette about southwest of the Baja California peninsula.

August 6

  • 12:00 UTC (6:00 a.m. CST) at A tropical Depression forms from a low-pressure area about southeast of Acapulco.
  • 18:00 UTC (12:00 p.m. CST) at The tropical depression southeast of Acapulco strengthens into Tropical Storm Ivo.

August 8

  • 06:00 UTC (8:00 p.m. HST, August 7) at Tropical Storm Henriette degenerates into a remnant low far to the southwest of the Baja California peninsula while approaching the central Pacific basin.

August 9

  • 00:00 UTC (5:00 p.m. MST, August 8) at Tropical Storm Ivo attains its peak intensity with maximum sustained winds of and minimum central pressure of , about southwest of the Baja California peninsula.
  • 06:00 UTC (8:00 p.m. HST, August 8) at The remnants of Tropical Storm Henriette regenerate into a tropical depression within the central Pacific basin about east of Hawaii.
  • 18:00 UTC (8:00 a.m. HST) at Tropical Depression Henriette restrengthens into a tropical storm about east of Hawaii.

August 10

  • 18:00 UTC (8:00 a.m. HST) at Tropical Storm Henriette strengthens into a Category 1 hurricane about northeast of Hawaii.

August 11

  • 00:00 UTC (5:00 p.m. PDT, August 10) at Tropical Storm Ivo weakens into a tropical depression about west of the Baja California peninsula.
  • 06:00 UTC (11:00 p.m. PDT, August 10) at Tropical Depression Ivo degenerates into a remnant low west of the Baja California peninsula, and later dissipates.
  • 12:00 UTC (2:00 a.m. HST) at Hurricane Henriette attains its peak intensity with maximum sustained winds of and minimum central pressure of , about north of Hawaii.

August 12

  • 12:00 UTC (2:00 a.m. HST) at Hurricane Henriette weakens into a tropical storm about northeast of Hawaii.

August 13

  • 06:00 UTC (8:00 p.m. HST, August 12) at Tropical Storm Henriette degenerates into a remnant low far to the northwest of Hawaii, and subsequently dissipates.

August 24

  • 18:00 UTC (11:00 a.m. MST) at Tropical Depression Ten-E forms from a tropical wave about south of the southern tip of the Baja California peninsula.

August 25

  • 06:00 UTC (11:00 p.m. MST, August 24) at Tropical Depression Ten-E strengthens into Tropical Storm Juliette about south-southwest of the southern tip of the Baja California peninsula.

August 26

  • 12:00 UTC (5:00 a.m. PDT) at Tropical Storm Juliette attains its peak intensity with maximum sustained winds of and minimum central pressure of , about west of Clarion Island.

August 28

  • 06:00 UTC (11:00 p.m. PDT, August 27) at Tropical Storm Juliette degenerates into a remnant low west of the Baja California peninsula, and subsequently dissipates.

August 31

  • 00:00 UTC (2:00 p.m. HST, August 30) at Tropical Depression Eleven-E forms from a tropical wave, about southwest of the southern tip of the Baja California Peninsula.
  • 12:00 UTC (2:00 a.m. HST) at Tropical Depression Eleven-E strengthens into Tropical Storm Kiko, about southwest of the southern tip of the Baja California Peninsula.

September

September 2

  • 00:00 UTC (6:00 p.m. CST, September 1) at Tropical Depression Twelve-E forms from a tropical wave about south of Manzanillo, Colima.
  • 06:00 UTC (8:00 p.m. HST, September 1) at Tropical Storm Kiko strengthens into a Category 1 hurricane, about southwest of the southern tip of the Baja California Peninsula.
  • 06:00 UTC (11:00 p.m. MST, September 1) at Tropical Depression Twelve-E strengthens into Tropical Storm Lorena about southwest Manzanillo.

September 3

  • 00:00 UTC (2:00 p.m. HST, September 2) at Hurricane Kiko intensifies to Category 2 strength, about southwest of the southern tip of the Baja California Peninsula.
  • 06:00 UTC (11:00 p.m. MST, September 2) at Tropical Storm Lorena strengthens into a Category 1 hurricane about southwest of Cabo San Lucas, Baja California Sur.
  • 18:00 UTC (8:00 a.m. HST) at Hurricane Kiko intensifies to Category 3 strength, about southwest of the southern tip of the Baja California Peninsula.

September 4

  • 00:00 UTC (2:00 p.m. HST, September 3) at Hurricane Kiko intensifies to Category 4 strength, and simultaneously attains its peak intensity with maximum sustained winds of and minimum central pressure of , about southwest of the southern tip of the Baja California Peninsula.
  • 00:00 UTC (5:00 p.m. MST, September 3) at Hurricane Lorena attains its peak intensity with maximum sustained winds of and minimum central pressure of , about west of Cabo San Lucas.
  • 12:00 UTC (5:00 a.m. MST) at Hurricane Lorena weakens into a tropical storm about west of Cabo San Lucas.

September 5

  • 00:00 UTC (2:00 p.m. HST, September 4) at Hurricane Kiko weakens to Category 3 strength, about east of Hawaii.
  • 00:00 UTC (5:00 p.m. PDT, September 3) at Tropical Storm Lorena transitions into a post-tropical cyclone about west of Cabo San Lucas, and subsequently dissipates.

September 6

  • 00:00 UTC (2:00 p.m. HST, September 5) at Hurricane Kiko re-intensifies to Category 4 strength.
  • 06:00 UTC (8:00 p.m. HST, September 5) at Hurricane Kiko attains secondary-peak sustained winds of , about east of Hawaii.
  • 12:00 UTC (2:00 a.m. HST) at Hurricane Kiko weakens to Category 3 strength, shortly after crossing over into the central Pacific basin.

September 7

  • 18:00 UTC (8:00 a.m. HST) at Hurricane Kiko weakens to Category 2 strength, about east of Hawaii.

September 8

  • 18:00 UTC (8:00 a.m. HST) at Hurricane Kiko weakens to Category 1 strength, about east of Hawaii.

September 9

  • 06:00 UTC (8:00 p.m. HST, September 8) at Hurricane Kiko weakens into a tropical storm, about east of Hawaii.

September 10

  • 12:00 UTC (2:00 a.m. HST) at Tropical Storm Kiko degenerates into a remnant low, about northeast of Hawaii.

September 11

  • 06:00 UTC (12:00 a.m. CST. ) at Tropical Depression Thirteen-E forms from a tropical wave about southeast of Acapulco, Guerrero.

September 12

  • 00:00 UTC (6:00 p.m. CST, September 11) at Tropical Depression Thirteen-E strengthens into Tropical Storm Mario and simultaneously attains its initial peak intensity, with maximum sustained winds of and minimum central pressure of , about southeast of Acapulco.
  • 18:00 UTC (12:00 p.m. CST) at Tropical Storm Mario weakens into a tropical depression about west of Acapulco.

September 13

  • 00:00 UTC (6:00 p.m. CST, September 12) at Tropical Depression Mario opens into a surface trough about west of Acapulco.

September 14

  • 06:00 UTC (11:00 p.m. MST, September 13) at The remnants of Tropical Storm Mario regenerate into a tropical depression about south of the southern tip of the Baja California peninsula.
  • 12:00 UTC (5:00 a.m. MST) at Tropical Depression Mario re-strengthens into a tropical storm about south of the southern tip of the Baja California peninsula.

September 15

  • 12:00 UTC (5:00 a.m. MST) at Tropical Storm Mario attains its peak intensity, with maximum sustained winds of and minimum central pressure of , about southwest of the southern tip of the Baja California peninsula.

September 16

  • 12:00 UTC (5:00 a.m. PDT) at Tropical Storm Mario degenerates into post-tropical low west of Baja California Sur, and subsequently dissipates.

September 21

  • 18:00 UTC (12:00 p.m. CST) at Tropical Storm Narda forms from a tropical wave about south-southeast of Zihuatanejo, Guerrero.

September 23

  • 06:00 UTC (11:00 p.m. MST, September 22) at Tropical Storm Narda strengthens into a Category 1 hurricane about southwest of Zihuatanejo.

September 24

  • 00:00 UTC (5:00 p.m. MST, September 23) at Hurricane Narda intensifies into a Category 2 hurricane far to the south of the Baja California peninsula.
  • 06:00 UTC (11:00 p.m. MST, September 23) at Hurricane Narda attains its peak intensity with maximum sustained winds of and minimum central pressure of , far to the south of the Baja California peninsula.

September 25

  • 00:00 UTC (5:00 p.m. MST, September 24) at Hurricane Narda weakens into a Category 1 hurricane far to the south-southwest of the Baja California peninsula.

September 28

  • 00:00 UTC (5:00 p.m. PDT, September 27) at Hurricane Narda weakens into a tropical storm far to the west-southwest of the Baja California peninsula.
  • 18:00 UTC (2:00 p.m. PDT) at Tropical Storm Narda degenerates into a remnant low far to the west of the Baja California peninsula, and subsequently dissipates.

September 30

  • 00:00 UTC (4:00 p.m. MST, September 29) at Tropical Depression Fifteen-E forms from a convective complex about south of the southern tip of the Baja California Peninsula.
  • 12:00 UTC (5:00 a.m. MST) at Tropical Depression Fifteen-E strengthens into Tropical Storm Octave about south-southwest of the southern tip of the Baja California peninsula.

October

October 4

  • 12:00 UTC (5:00 a.m. MST) at A tropical depression forms from a monsoon trough about south-southwest of Manzanillo, Colima.
  • 18:00 UTC (11:00 a.m. MST) at The newly formed tropical depression strengrhens into Tropical Storm Priscilla about south-southwest of Manzanillo.

October 5

  • 06:00 UTC (11:00 p.m. PDT, October 4) at Tropical Storm Octave strengthens into a Category 1 hurricane about west-southwest of the southern tip of the Baja California peninsula, and abruptly reverses direction.

October 6

  • 00:00 UTC (5:00 p.m. PDT, October 5) at Hurricane Octave attains its peak intensity, with maximum sustained winds of and minimum central pressure of , about west-southwest of the southern tip of the Baja California peninsula.
  • 00:00 UTC (5:00 p.m. MST, October 5) at Tropical Storm Priscilla strengthens into a Category 1 hurricane about south-southwest of Cabo Corrientes, Cabo Corrientes, Jalisco.
  • 12:00 UTC (5:00 a.m. PDT) at Hurricane Octave weakens into a tropical storm about west-southwest of the southern tip of the Baja California peninsula.

October 7

  • 06:00 UTC (11:00 p.m. MST, October 6) at Hurricane Priscilla intensifies into a Category 2 hurricane about 235 mi (375 km) west-southwest of Cabo Corrientes.
  • 18:00 UTC (11:00 a.m. MST) at Hurricane Priscilla intensifies into a Category 3 hurricane and simultaneously attains its peak intensity with maximum sustained winds maximum sustained winds of and minimum central pressure of , about south-southwest of the southern tip of the Baja California peninsula.

October 8

  • 00:00 UTC (5:00 p.m. MST, October 7) at Hurricane Priscilla weakens into a Category 2 hurricane about south-southwest of the southern tip of the Baja California peninsula.
  • 06:00 UTC (11:00 p.m. MST, October 7) at Hurricane Priscilla weakens into a Category 1 hurricane about southwest of the southern tip of the Baja California peninsula.
  • 18:00 UTC (11:00 a.m. MST) at Hurricane Priscilla weakens into a tropical storm about west-southwest of the southern tip of the Baja California peninsula.

October 9

  • 06:00 UTC (12:00 a.m. CST) at Tropical Depression Seventeen-E forms from a broad area of low pressure associated with the eastern North Pacific monsoon trough about southeast of Acapulco, Guerrero.
  • 12:00 UTC (5:00 a.m  MST) at Tropical Storm Octave degenerates into a post-tropical low about south of the southern tip of the Baja California peninsula, and later dissipates.
  • 12:00 UTC (6:00 p.m. CST) at Tropical Depression Seventeen-E strengthens into Tropical Storm Raymond about south of Acapulco.

October 10

  • 06:00 UTC (12:00 a.m. CST) at Tropical Storm Raymond attains its peak intensity, with maximum sustained winds of and minimum central pressure of , while paralleling the coast of southwestern Mexico.
  • 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Priscilla weakens into a tropical depression about northwest of the southern tip of the Baja California peninsula.

October 11

  • 00:00 UTC (5:00 p.m. PDT, October 10) at Tropical Storm Priscilla degenerates into a remnant low about northwest of the southern tip of the Baja California peninsula.
  • 18:00 UTC (11:00 a.m. MST) at Tropical Storm Raymond degenerates into a remnant low while approaching the southern tip of the Baja California peninsula, and subsequently dissipates.

October 24

  • 06:00 UTC (11:00 p.m. PDT, October 27) at Tropical Depression Eighteen-E forms from a tropical wave about south-southwest of the southern tip of the Baja California peninsula.

October 25

  • 00:00 UTC (5:00 p.m. PDT, October 24) at Tropical Depression Eighteen-E strengthens into Tropical Storm Sonia about southwest of the southern tip of the Baja California peninsula.
  • 18:00 UTC (11:00 a.m. PDT) at Tropical Storm Sonia attains its peak intensity with maximum sustained winds of and minimum central pressure of , about southwest of the southern tip of the Baja California peninsula.

October 29

  • 00:00 UTC (5:00 p.m. PDT, October 28) at Tropical Storm Sonia degenerates into a post-tropical remnant low about west-southwest of the southern tip of the Baja California peninsula, and later dissipates.

November

  • No tropical cyclones form in either the eastern or central Pacific basins during the month of November.

November 30

  • The 2025 Pacific hurricane season officially ends in the Eastern and Central Pacific basins.

See also

Notes

References

External links