Weather Forecast and Radar for Grayslake, Illinois

Weather in Grayslake, IL

Grayslake, Illinois has a continental climate with four distinct seasons. Summers are warm and humid with temperatures typically ranging from the mid-60s to the upper-80s. July is the hottest month of the year, with an average high temperature of 84°F and an average low temperature of 63°F. Winters are cold and snowy, with temperatures typically ranging from the low-30s to the mid-40s. January is the coldest month of the year, with an average high temperature of 37°F and an average low temperature of 23°F. Spring and fall are mild and generally pleasant, with temperatures typically ranging from the mid-40s to the mid-70s. April is the warmest month of the spring season, with an average high temperature of 64°F and an average low temperature of 44°F. October is the warmest month of the fall season, with an average high temperature of 66°F and an average low temperature of 45°F.

Fast Facts About Grayslake, IL

As of 2020, the city population is 20482.

Major Cities Nearby Grayslake, IL

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