Climate Insights for Edwardsville

The climate in Edwardsville is temperate. The average annual temperature is 15°C and approximately 1173mm of precipitation falls per year. Edwardsville receives a notable amount of rainfall throughout the year, including during its driest month. Edwardsville is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are January, December, February, when temperatures can drop to -3°C. Light snow can occur between January and December.

Temperatures in Edwardsville vary considerably across the year, with a 35°C difference between the coldest and warmest months. The warmest month is June, when average highs reach 32°C and the mean temperature sits around 26°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is 0°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 9°C shift in average temperatures.

Edwardsville is a moderately rainy area, receiving approximately 1173mm of precipitation annually, which averages out to around 98mm per month. The wettest month is August, averaging 217mm of rainfall. September and July also tend to see above-average precipitation. The driest month is June, with just 32mm. That's 184mm less than August, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between January and December, totalling around 38cm annually. February is the snowiest month with approximately 25cm.

Edwardsville 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 February, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Edwardsville, which began on June 21, 2026. Edwardsville 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 June at around 32°C, while the coldest stretch bottoms out in January near -3°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Edwardsville is during October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 49mm per month. By contrast, June can be uncomfortably hot with highs reaching 32°C, while January is the coldest period with lows dropping to -3°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 Edwardsville 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.