In August, St. John's typically sees daytime highs of 19.9°C and overnight lows around 11.8°C. Compared to the annual average high of 9.1°C, August runs +10.8°C.
August in St. John's averages a daytime high of 19.9°C and an overnight low of 11.8°C.
August runs +10.8°C compared to St. John's's annual average high of 9.1°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 19.9°C and cooler evenings around 11.8°C.