In September, Montreuil typically sees daytime highs of 20.7°C and overnight lows around 10.5°C. Compared to the annual average high of 14.9°C, September runs +5.8°C.
September in Montreuil averages a daytime high of 20.7°C and an overnight low of 10.5°C.
September runs +5.8°C compared to Montreuil's annual average high of 14.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 20.7°C and cooler evenings around 10.5°C.