In October, Ottawa typically sees daytime highs of 13.2°C and overnight lows around 2.7°C. Compared to the annual average high of 11.1°C, October runs +2.2°C.
October in Ottawa averages a daytime high of 13.2°C and an overnight low of 2.7°C.
October runs +2.2°C compared to Ottawa's annual average high of 11.1°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 13.2°C and cooler evenings around 2.7°C.