In August, Waterloo typically sees daytime highs of 25.1°C and overnight lows around 12.6°C. Compared to the annual average high of 11.9°C, August runs +13.2°C.
August in Waterloo averages a daytime high of 25.1°C and an overnight low of 12.6°C.
August runs +13.2°C compared to Waterloo's annual average high of 11.9°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 25.1°C and cooler evenings around 12.6°C.