In September, La Roche-sur-Yon typically sees daytime highs of 21.7°C and overnight lows around 11.4°C. Compared to the annual average high of 15.9°C, September runs +5.8°C.
September in La Roche-sur-Yon averages a daytime high of 21.7°C and an overnight low of 11.4°C.
September runs +5.8°C compared to La Roche-sur-Yon's annual average high of 15.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 21.7°C and cooler evenings around 11.4°C.