In October, Ontario typically sees daytime highs of 25.3°C and overnight lows around 10.2°C. Compared to the annual average high of 23.1°C, October runs +2.1°C.
October in Ontario averages a daytime high of 25.3°C and an overnight low of 10.2°C.
October runs +2.1°C compared to Ontario's annual average high of 23.1°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 25.3°C and cooler evenings around 10.2°C.