In August, St. Catharines typically sees daytime highs of 25.4°C and overnight lows around 16.1°C. Compared to the annual average high of 12.9°C, August runs +12.6°C.
August in St. Catharines averages a daytime high of 25.4°C and an overnight low of 16.1°C.
August runs +12.6°C compared to St. Catharines's annual average high of 12.9°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 25.4°C and cooler evenings around 16.1°C.