In September, Chatham typically sees daytime highs of 18.3°C and overnight lows around 10.8°C. Compared to the annual average high of 13.3°C, September runs +5.0°C.
September in Chatham averages a daytime high of 18.3°C and an overnight low of 10.8°C.
September runs +5.0°C compared to Chatham's annual average high of 13.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.3°C and cooler evenings around 10.8°C.