Climate Insights for East Gwillimbury

The climate in East Gwillimbury is cool. The average annual temperature is 9°C and approximately 765mm of precipitation falls per year. East Gwillimbury receives a notable amount of rainfall throughout the year, including during its driest month. East Gwillimbury is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to -9°C. East Gwillimbury experiences heavy snowfall, typically from January through December.

East Gwillimbury has a wide annual temperature range, spanning 37°C from the coldest to warmest months. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 22°C. The coldest month is January, when overnight lows fall to -9°C and the daily average is -5°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 10°C shift in average temperatures.

East Gwillimbury is a relatively dry area, receiving approximately 765mm of precipitation annually, which averages out to around 64mm per month. The wettest month is March, averaging 131mm of rainfall. December and February also tend to see above-average precipitation. The driest month is May, with just 40mm. That's 91mm less than March, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. East Gwillimbury receives heavy snowfall, accumulating around 209cm annually from January through December. The snowiest month is December, with approximately 65cm. Winter travel should account for significant snow cover.

East Gwillimbury 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 December, 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. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently summer in East Gwillimbury, which began on June 21, 2026. East Gwillimbury 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 August at around 28°C, while the coldest stretch bottoms out in January near -9°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit East Gwillimbury is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 52mm per month. By contrast, January can be quite cold with temperatures dropping to -9°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 East Gwillimbury 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.