Climate Insights for Saint-Hyacinthe

The climate in Saint-Hyacinthe is cool. The average annual temperature is 7°C and approximately 1213mm of precipitation falls per year. Saint-Hyacinthe receives a notable amount of rainfall throughout the year, including during its driest month. Saint-Hyacinthe is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to -12°C. Saint-Hyacinthe experiences heavy snowfall, typically from January through December.

Saint-Hyacinthe has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is July, when average highs reach 27°C and the mean temperature sits around 22°C. The coldest month is January, when overnight lows fall to -12°C and the daily average is -8°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 8°C shift in average temperatures.

Saint-Hyacinthe is a fairly wet location, receiving approximately 1213mm of precipitation annually, which averages out to around 101mm per month. The wettest month is August, averaging 132mm of rainfall. June and October also tend to see above-average precipitation. The driest month is September, with just 68mm. That's 64mm less than August, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Saint-Hyacinthe receives heavy snowfall, accumulating around 226cm annually from January through December. The snowiest month is January, with approximately 58cm. Winter travel should account for significant snow cover.

Saint-Hyacinthe is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Saint-Hyacinthe, which began on June 21, 2026. Saint-Hyacinthe is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 27°C, while the coldest stretch bottoms out in January near -12°C. Autumn is next, beginning on September 23, 2026 (14 days from now).

The best time to visit Saint-Hyacinthe is during September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 68mm per month. By contrast, July can be uncomfortably hot with highs reaching 27°C, while January is the coldest period with lows dropping to -12°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Saint-Hyacinthe based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.