In September, Hamilton typically sees daytime highs of 16.4°C and overnight lows around 6.0°C. Compared to the annual average high of 19.0°C, September runs -2.6°C.
September in Hamilton averages a daytime high of 16.4°C and an overnight low of 6.0°C.
September runs -2.6°C compared to Hamilton's annual average high of 19.0°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 16.4°C and cooler evenings around 6.0°C.