In September, Hamilton typically sees daytime highs of 21.5°C and overnight lows around 9.9°C. Compared to the annual average high of 12.8°C, September runs +8.8°C.
September in Hamilton averages a daytime high of 21.5°C and an overnight low of 9.9°C.
September runs +8.8°C compared to Hamilton's annual average high of 12.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 21.5°C and cooler evenings around 9.9°C.