In September, Niort typically sees daytime highs of 22.4°C and overnight lows around 11.3°C. Compared to the annual average high of 16.4°C, September runs +6.0°C.
September in Niort averages a daytime high of 22.4°C and an overnight low of 11.3°C.
September runs +6.0°C compared to Niort's annual average high of 16.4°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 22.4°C and cooler evenings around 11.3°C.