Climate Insights for Summerville

The climate in Summerville is warm and mild. The average annual temperature is 19°C and approximately 1307mm of precipitation falls per year. Summerville receives a notable amount of rainfall throughout the year, including during its driest month. Summerville 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, December, February, when temperatures can drop to 5°C.

Temperatures in Summerville vary considerably across the year, with a 28°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 33°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 5°C and an average of 10°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Summerville is a fairly wet location, receiving approximately 1307mm of precipitation annually, which averages out to around 109mm per month. The wettest month is July, averaging 182mm of rainfall. August and June also tend to see above-average precipitation. The driest month is November, with just 53mm. That's 129mm less than July, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Summerville is relatively calm, with an average annual wind speed of 10km/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 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap 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 11km/h in winter, 11km/h in spring, 8km/h in summer, 10km/h in autumn.

It is currently summer in Summerville, which began on June 21, 2026. Summerville 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 33°C, while the coldest stretch bottoms out in January near 5°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Summerville is during March, April and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 86mm per month. By contrast, July can be uncomfortably hot with highs reaching 33°C, while January is the coldest period with lows dropping to 5°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 Summerville 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. 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.