In March, Sarnia typically sees daytime highs of 4.8°C and overnight lows around -3.9°C. Compared to the annual average high of 13.3°C, March runs -8.5°C.
March in Sarnia averages a daytime high of 4.8°C and an overnight low of -3.9°C.
March runs -8.5°C compared to Sarnia's annual average high of 13.3°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 4.8°C and cooler evenings around -3.9°C.