In September, Weymouth typically sees daytime highs of 17.3°C and overnight lows around 11.7°C. Compared to the annual average high of 12.9°C, September runs +4.4°C.
September in Weymouth averages a daytime high of 17.3°C and an overnight low of 11.7°C.
September runs +4.4°C compared to Weymouth's annual average high of 12.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 17.3°C and cooler evenings around 11.7°C.