Weather Forecast and Radar for Collinsville, Illinois

Weather in Collinsville, IL

Collinsville, Illinois is known for its distinct four seasons. In the winter months, temperatures range from the high 20s and low 30s in December and January, to the mid-40s in February. Snowfall is generally light, with an average of 4 inches in December and January and 3 inches in February.

In the spring, temperatures start to rise as the days get longer. March is the beginning of the warm season, with temperatures reaching the mid-50s. April is even warmer, with temperatures ranging from the mid-50s to the low 70s. May is the warmest month of the year, with temperatures reaching the mid-70s. Rainfall becomes more frequent in the spring, with an average of 4 inches in March, 5 inches in April and 4 inches in May.

The summer months are hot and humid in Collinsville, with temperatures reaching the mid-80s in June and the high 80s in July and August. Rainfall is consistent throughout the summer, with an average of 4.5 inches in June, 4 inches in July and 4.5 inches in August.

The fall months bring cooler temperatures and shorter days. September is the beginning of the cool season, with temperatures ranging from the mid-60s to the low 70s. October is cooler, with temperatures ranging from the mid-50s to the low 60s. November is the coldest month of the year, with temperatures reaching the mid-40s. Rainfall is consistent throughout the fall, with an average of 4 inches in September, 3.5 inches in October and 3 inches in November.

Fast Facts About Collinsville, IL

As of 2020, the city population is 24489.

Major Cities Nearby Collinsville, IL

This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Collinsville, Illinois.