Nanterre's weather is characterized by mild springs and autumns, with temperatures gradually warming up from March, when averages reach 7°C, to May, which sees highs of 27°C. Summers are warm but not excessively hot, peaking at 30°C in July and August, while winters are cool, with January averaging just 4°C. April and October experience similar temperature ranges, with averages around 8-11°C, indicating a moderate climate overall. The warmer months, June to September, enjoy average highs above 18°C, whereas the colder months, December to February, hover around 6°C.