In October, Sarnia typically sees daytime highs of 15.7°C and overnight lows around 5.3°C. Compared to the annual average high of 13.3°C, October runs +2.3°C.
October in Sarnia averages a daytime high of 15.7°C and an overnight low of 5.3°C.
October runs +2.3°C compared to Sarnia's annual average high of 13.3°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 15.7°C and cooler evenings around 5.3°C.