Last updated: June 18, 2025
The average temperature in Saint-Jean-sur-Richelieu, Canada during October hovers around 10°C (51°F). Expect minimum temperatures to drop to a chilly -5°C (23°F), while the maximum can rise to a pleasant 27°C (81°F). Be prepared for the weather, as precipitation amounts to 144 mm (5.7 in) over approximately 15 days, and enjoy the average humidity of a high 86%.
In October in Saint-Jean-sur-Richelieu, the average temperature is 10°C (51°F), with maximums reaching 27°C (81°F) and minimums dropping as low as -5°C (23°F). This variation in temperature makes Saint-Jean-sur-Richelieu a destination where travelers should be prepared for both warm and cold weather.
In Saint-Jean-sur-Richelieu in October, the precipitation amount is 144 mm (5.7 in) during a span of 15 days.
In Saint-Jean-sur-Richelieu in October humidity is 86%. With an average temperature of 10°C (51°F), this humidity feels like a cool, damp blanket enveloping you, making traveling feel invigorating yet slightly uncomfortable without the right layers.
In Saint-Jean-sur-Richelieu in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Saint-Jean-sur-Richelieu.
UV Risk Categories
Weather in Saint-Jean-sur-Richelieu varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Saint-Jean-sur-Richelieu, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 84 mm (3.3 inches) | 93% | low |
| February Weather | -6°C (21°F) | 79 mm (3.1 inches) | 92% | moderate |
| March Weather | -1°C (30°F) | 82 mm (3.2 inches) | 86% | moderate |
| April Weather | 6°C (44°F) | 114 mm (4.5 inches) | 85% | high |
| May Weather | 14°C (57°F) | 97 mm (3.8 inches) | 80% | very high |
| June Weather | 19°C (67°F) | 111 mm (4.4 inches) | 74% | very high |
| July Weather | 22°C (72°F) | 113 mm (4.4 inches) | 76% | very high |
| August Weather | 21°C (70°F) | 116 mm (4.6 inches) | 75% | very high |
| September Weather | 16°C (62°F) | 71 mm (2.8 inches) | 78% | high |
| October Weather | 10°C (51°F) | 144 mm (5.7 inches) | 86% | moderate |
| November Weather | 2°C (35°F) | 114 mm (4.5 inches) | 88% | moderate |
| December Weather | -4°C (25°F) | 81 mm (3.2 inches) | 89% | low |