Les Landes-Genusson has an oceanic climate (Köppen climate classificationCfb). The average annual temperature in Les Landes-Genusson is 12.2 °C (54.0 °F). The average annual rainfall is 906.4 mm (35.69 in) with November as the wettest month. The temperatures are highest on average in August, at around 19.6 °C (67.3 °F), and lowest in January, at around 5.7 °C (42.3 °F). The highest temperature ever recorded in Les Landes-Genusson was 40.1 °C (104.2 °F) on 5 August 2003; the coldest temperature ever recorded was −11.8 °C (10.8 °F) on 1 March 2005.
Climate data for Les Landes-Genusson (1981−2010 normals, extremes 1992−2017)