In September, Calais typically sees daytime highs of 18.0°C and overnight lows around 11.9°C. Compared to the annual average high of 12.7°C, September runs +5.3°C.
September in Calais averages a daytime high of 18.0°C and an overnight low of 11.9°C.
September runs +5.3°C compared to Calais's annual average high of 12.7°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 18.0°C and cooler evenings around 11.9°C.