Saint-Hilaire-sur-Helpe (, literally Saint-Hilaire on Helpe) is a commune in the Nord department in northern France.
Saint-Hilaire-sur-Helpe has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Saint-Hilaire-sur-Helpe is . The average annual rainfall is with August as the wettest month. The temperatures are highest on average in July, at around , and lowest in January, at around . The highest temperature ever recorded in Saint-Hilaire-sur-Helpe was on 25 July 2019; the coldest temperature ever recorded was on 7 January 2009.