In September, Oakville typically sees daytime highs of 22.1°C and overnight lows around 11.4°C. Compared to the annual average high of 13.2°C, September runs +8.9°C.
September in Oakville averages a daytime high of 22.1°C and an overnight low of 11.4°C.
September runs +8.9°C compared to Oakville's annual average high of 13.2°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 22.1°C and cooler evenings around 11.4°C.