In September, Newmarket typically sees daytime highs of 20.4°C and overnight lows around 9.0°C. Compared to the annual average high of 11.5°C, September runs +8.8°C.
September in Newmarket averages a daytime high of 20.4°C and an overnight low of 9.0°C.
September runs +8.8°C compared to Newmarket's annual average high of 11.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 20.4°C and cooler evenings around 9.0°C.