Climate Insights for Collinsville

The climate in Collinsville is warm and mild. The average annual temperature is 23°C and approximately 695mm of precipitation falls per year. January is the wettest month, receiving around 173mm of rainfall. Collinsville is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: December, November, January. The coldest months are July, August, June, when temperatures can drop to 12°C.

Temperatures in Collinsville vary considerably across the year, with a 21°C difference between the coldest and warmest months. The warmest month is December, when average highs reach 33°C and the mean temperature sits around 27°C. July is the coolest month, with minimum temperatures around 12°C and an average of 18°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

Collinsville is a relatively dry area, receiving approximately 695mm of precipitation annually, which averages out to around 58mm per month. The wettest month is January, averaging 173mm of rainfall. February and December also tend to see above-average precipitation. The driest month is September, with just 8mm. That's 165mm less than January, 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.

Collinsville is mildly breezy, with an average annual wind speed of 17km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 19km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 15km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 15km/h in winter, 18km/h in spring, 17km/h in summer, 17km/h in autumn.

It is currently autumn in Collinsville, which began on March 20, 2026. Collinsville is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in December at around 33°C, while the coldest stretch bottoms out in July near 12°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Collinsville is during April, May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 26mm per month. By contrast, December can be uncomfortably hot with temperatures reaching 33°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Collinsville 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.