Chicago averages roughly 950 mm (about 38 inches) of rain a year, spread fairly evenly across the seasons but concentrated in strong spring and summer thunderstorm activity. Sitting at the southern tip of Lake Michigan, the city’s weather is heavily shaped by lake effects, which can intensify or redirect storm systems in ways that are hard to predict from a general forecast alone. Severe thunderstorms capable of producing damaging wind, hail, and occasional tornadoes are a real spring and summer risk across the wider Chicago metro area, often developing quickly along squall lines that sweep in from the Plains. Because these systems can go from a distant cluster to a fast-moving line in under an hour, radar tracking gives a much clearer, more immediate picture than a standard forecast update. The region is covered by the National Weather Service’s Doppler radar network based southwest of the city.
Learn more: How Does Rain Radar Work? · Open the full Rain Map
Frequently Asked Questions
Is it raining in Chicago right now?
The map above shows recent radar observations over Chicago, Illinois where coverage is available. Use the map legend and timestamp to interpret the imagery. A blank map over Chicago can mean no detected precipitation, missing coverage, delayed data, or rain too light for radar to detect.
How often does the Chicago rain radar update?
Updates depend on the radar provider and local network. Check the timestamp on the map for the latest available frame, and press play to compare recent observations. Radar imagery can lag conditions on the ground.
Can I see if a storm is heading toward Chicago?
Press play to compare recent radar frames over Illinois and see the direction of detected rain. This can help you assess approaching showers near Chicago, but storms can grow or change direction; check your local weather service for forecasts and warnings.
Is this Chicago rain radar free to use?
Yes, completely free – no account, app download, or sign-up required. It works in any browser on desktop and mobile.