Climate Insights for Greater Sudbury

The climate in Greater Sudbury is cool. The average annual temperature is 5°C and approximately 932mm of precipitation falls per year. Greater Sudbury receives a notable amount of rainfall throughout the year, including during its driest month. Greater Sudbury 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 February, January, December, when temperatures can drop to -16°C. Light snow can occur between January and December.

Greater Sudbury has a wide annual temperature range, spanning 42°C from the coldest to warmest months. The warmest month is July, when average highs reach 26°C and the mean temperature sits around 20°C. February brings the harshest conditions, with lows dropping to -16°C and an average temperature of -10°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 9°C shift in average temperatures.

Greater Sudbury is a moderately rainy area, receiving approximately 932mm of precipitation annually, which averages out to around 78mm per month. The wettest month is October, averaging 105mm of rainfall. April and August also tend to see above-average precipitation. The driest month is January, with just 54mm. That's 51mm less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Light snowfall can occur between January and December, totalling around 11cm annually. January is the snowiest month with approximately 3cm.

Greater Sudbury is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 4km/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 spring in Greater Sudbury, which began on March 20, 2026. Greater Sudbury 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 26°C, while the coldest stretch bottoms out in February near -16°C. Summer is next, beginning on June 21, 2026 — 10 days from now.

The best time to visit Greater Sudbury is during June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 87mm per month. By contrast, February can be quite cold with temperatures dropping to -16°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Greater Sudbury 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.