Génolhac has a hot-summer Mediterranean climate (Köppen climate classificationCsa). The average annual temperature in Génolhac is 13.2 °C (55.8 °F). The average annual rainfall is 1,692.5 mm (66.63 in) with November as the wettest month. The temperatures are highest on average in July, at around 22.4 °C (72.3 °F), and lowest in January, at around 5.3 °C (41.5 °F). The highest temperature ever recorded in Génolhac was 42.3 °C (108.1 °F) on 28 June 2019; the coldest temperature ever recorded was −13.0 °C (8.6 °F) on 12 January 1987.
Climate data for Génolhac (1991−2020 normals, extremes 1974−present)