In September, Granby typically sees daytime highs of 19.4°C and overnight lows around 8.1°C. Compared to the annual average high of 10.7°C, September runs +8.7°C.
September in Granby averages a daytime high of 19.4°C and an overnight low of 8.1°C.
September runs +8.7°C compared to Granby's annual average high of 10.7°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 19.4°C and cooler evenings around 8.1°C.