In September, Gatineau typically sees daytime highs of 20.1°C and overnight lows around 8.5°C. Compared to the annual average high of 11.1°C, September runs +9.0°C.
September in Gatineau averages a daytime high of 20.1°C and an overnight low of 8.5°C.
September runs +9.0°C compared to Gatineau's annual average high of 11.1°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 20.1°C and cooler evenings around 8.5°C.