In August, Saint John typically sees daytime highs of 22.2°C and overnight lows around 11.7°C. Compared to the annual average high of 10.4°C, August runs +11.9°C.
August in Saint John averages a daytime high of 22.2°C and an overnight low of 11.7°C.
August runs +11.9°C compared to Saint John's annual average high of 10.4°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 22.2°C and cooler evenings around 11.7°C.