Winters in La Roche-sur-Yon are cool, with temperatures rarely dropping below 0°C and averaging around 6-8°C. Spring brings rapid warming, with March often seeing temperatures rise above 20°C for the first time, and April and May averaging highs of 25°C. Summer is warm to hot, with June and July typically seeing temperatures reach up to 32°C, while August averages slightly lower highs. Autumn is mild, with September often feeling warm, but October and November see a return to cooler temperatures, similar to those of winter.