Weather Forecast and Radar for Lake Forest, Illinois

Weather in Lake Forest, IL

Lake Forest, Illinois, United States experiences four distinct seasons throughout the year, although temperatures remain relatively mild. In the winter, temperatures usually hover around the mid-30's Fahrenheit though can sometimes dip below freezing. January is the coldest month, with an average low of 22°F and an average high of 35°F. Snowfall is moderate during the winter, with an average of 20 inches of snow per year.

In the spring, temperatures gradually increase with the average low in March reaching 36°F and the average high reaching 48°F. April is the rainiest month of the year, with an average of 3.5 inches of rain.

Summer in Lake Forest is rather warm and humid, with temperatures reaching an average high of 81°F in July. The average low in July is 64°F. Rainfall is moderate during the summer months, with an average of 3.5 inches of rain per month.

In the fall, temperatures gradually cool down to an average low of 41°F and an average high of 63°F. October is the driest month, with an average of 2.6 inches of rain.

Fast Facts About Lake Forest, IL

As of 2020, the city population is 19497.

Major Cities Nearby Lake Forest, IL

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