In September, Laval typically sees daytime highs of 20.5°C and overnight lows around 10.4°C. Compared to the annual average high of 15.0°C, September runs +5.5°C.
September in Laval averages a daytime high of 20.5°C and an overnight low of 10.4°C.
September runs +5.5°C compared to Laval's annual average high of 15.0°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 20.5°C and cooler evenings around 10.4°C.