In October, Saint-Jean-sur-Richelieu typically sees daytime highs of 13.4°C and overnight lows around 3.6°C. Compared to the annual average high of 11.2°C, October runs +2.2°C.
October in Saint-Jean-sur-Richelieu averages a daytime high of 13.4°C and an overnight low of 3.6°C.
October runs +2.2°C compared to Saint-Jean-sur-Richelieu's annual average high of 11.2°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 13.4°C and cooler evenings around 3.6°C.