In August, Montreal typically sees daytime highs of 24.7°C and overnight lows around 13.8°C. Compared to the annual average high of 10.8°C, August runs +13.9°C.
August in Montreal averages a daytime high of 24.7°C and an overnight low of 13.8°C.
August runs +13.9°C compared to Montreal's annual average high of 10.8°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 24.7°C and cooler evenings around 13.8°C.