Climate Insights for Summerside

The climate in Summerside is cool. The average annual temperature is 7°C and approximately 1226mm of precipitation falls per year. Summerside receives a notable amount of rainfall throughout the year, including during its driest month. Summerside is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, March, when temperatures can drop to -9°C. Snowfall occurs from January to December, with around 185cm accumulating over the season.

Temperatures in Summerside vary considerably across the year, with a 31°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 22°C with a mean of 20°C. The coldest month is February, when overnight lows fall to -9°C and the daily average is -6°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between October and November, with a 8°C shift in average temperatures.

Summerside is a fairly wet location, receiving approximately 1226mm of precipitation annually, which averages out to around 102mm per month. The wettest month is November, averaging 130mm of rainfall. January and October also tend to see above-average precipitation. The driest month is May, with just 80mm. That's 50mm less than November, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 185cm accumulating over the season. February typically sees the most snow at around 47cm.

Summerside is very windy, with an average annual wind speed of 32km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 36km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in July, with average winds dropping to 26km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 10km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 35km/h in winter, 31km/h in spring, 27km/h in summer, 33km/h in autumn.

It is currently spring in Summerside, which began on March 20, 2026. Summerside 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 22°C, while the coldest stretch bottoms out in February near -9°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Summerside is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 88mm per month. By contrast, February can be quite cold with temperatures dropping to -9°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 Summerside 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.