In September, La Rochelle typically sees daytime highs of 21.6°C and overnight lows around 13.3°C. Compared to the annual average high of 16.0°C, September runs +5.6°C.
September in La Rochelle averages a daytime high of 21.6°C and an overnight low of 13.3°C.
September runs +5.6°C compared to La Rochelle's annual average high of 16.0°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 21.6°C and cooler evenings around 13.3°C.