Lightning Map — Illinois

Track real-time lightning strikes and thunderstorm activity across Illinois. With an average of 40 thunderstorm days per year, Illinois is a moderately active state for thunderstorms.

40
Avg Storm Days/Year
7
Cities Tracked
12.8M
Population

Data sourced from NOAA GOES-19 Geostationary Lightning Mapper (GLM) and the Storm Prediction Center (SPC).

About Lightning in Illinois

Illinois averages 40 thunderstorm days per year, placing it above the national average of 25 days. Located at approximately 40°N latitude, Illinois is stretching from the Great Lakes to the confluence of the Mississippi and Ohio rivers, with flat terrain that allows storm systems to sweep across the state unimpeded.

In Illinois, frontal boundaries and warm moist air from the south converge across flat terrain. Peak thunderstorm activity occurs during May through August, when conditions align for the most frequent lightning strikes. With a population of 12.8 million residents, storm awareness and lightning safety are critical concerns for anyone living in or visiting Illinois.

#20
out of 50 states
40
storm days/year
15 more than the US average

When Thunderstorms Peak in Illinois

Thunderstorm season in Illinois runs from May through August. Spring severe weather season can produce dangerous storms when warm moist air collides with cooler air masses. Summer storms are driven by afternoon convective heating, typically building in the mid to late afternoon hours.

Peak Season
May through August

Top Cities in Illinois

Monitor lightning activity in these Illinois cities

Chicago

IL
38 storm days/yr

Aurora

IL
40 storm days/yr

Naperville

IL
40 storm days/yr

Joliet

IL
40 storm days/yr

Rockford

IL
38 storm days/yr

Springfield

IL
42 storm days/yr

Peoria

IL
42 storm days/yr

Lightning Safety in Illinois

Stay safe during the 40 thunderstorm days Illinois averages each year

Follow the 30-30 Rule

If the time between seeing lightning and hearing thunder is 30 seconds or less, seek shelter. Stay indoors for 30 minutes after the last thunderclap.

Stay Indoors During Storms

With 40 thunderstorm days annually in Illinois, having a plan for when storms strike is essential. Avoid windows and stay away from plumbing.

Monitor Lightning Activity

Use Lightning Tracker to get real-time alerts when storms approach your area in Illinois. Early awareness helps you make safer decisions.

Outdoor Safety

If caught outside, avoid open fields, hilltops, and isolated trees. Seek shelter in a substantial building or hard-topped vehicle.

Useful Guides for Illinois

These pages help visitors who search for maps, nearby strikes, and alert setup

Near me How to check lightning near you in Illinois

Use this guide when you want to know how fast nearby strikes can become a real safety problem in Illinois.

 Map guide How to read a lightning map for Illinois

Understand clusters, timing, and storm movement before using launch alerts in the app.

 Alerts Best ways to get lightning alerts in Illinois

Compare app alerts, NOAA weather radio, and local warning workflows for storms in your area.
App links later

Track Lightning in Illinois Right Now

The app links can be added after release. For now, use the Illinois hub, city pages, and lightning guides to cover map and safety intent.

Launching Soon iOS & Android

App links go live at release. For now use the lightning maps and guides on this site.