In September, Trois-Rivieres typically sees daytime highs of 18.9°C and overnight lows around 7.9°C. Compared to the annual average high of 10.1°C, September runs +8.9°C.
September in Trois-Rivieres averages a daytime high of 18.9°C and an overnight low of 7.9°C.
September runs +8.9°C compared to Trois-Rivieres's annual average high of 10.1°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.9°C and cooler evenings around 7.9°C.