In June, Ontario typically sees daytime highs of 27.4°C and overnight lows around 12.0°C. Compared to the annual average high of 23.1°C, June runs +4.2°C.
June in Ontario averages a daytime high of 27.4°C and an overnight low of 12.0°C.
June runs +4.2°C compared to Ontario's annual average high of 23.1°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 27.4°C and cooler evenings around 12.0°C.