Rueil-Malmaison experiences a mild climate with significant seasonal variations. Winters are chilly, with January and February averaging around 4-6°C, while temperatures can drop to as low as -7°C in February. As spring approaches, temperatures gradually rise, reaching averages of 12°C in May and 18°C in June, with occasional heatwaves that can push temperatures up to 32°C. Summer months, July and August, are warm but not scorching hot, averaging around 19-20°C, while autumn sees a return to milder temperatures, averaging around 11-17°C.