In April, Sarnia typically sees daytime highs of 12.8°C and overnight lows around 1.8°C. Compared to the annual average high of 13.3°C, April runs -0.5°C.
April in Sarnia averages a daytime high of 12.8°C and an overnight low of 1.8°C.
April runs -0.5°C compared to Sarnia's annual average high of 13.3°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 12.8°C and cooler evenings around 1.8°C.