Illinois

Comprehensive weather forecasts, local alerts, and climate data for every county and city in Illinois.

Capital City

Chicago

Total Population

13,047,514

Timezone

N/A

Abbreviation

IL

Major Cities

Chicago

2,664,452 Residents

74°

Aurora

200,661 Residents

69°

Rockford

148,278 Residents

78°

Joliet

147,861 Residents

85°

Naperville

147,100 Residents

82°

Peoria

115,070 Residents

83°

Springfield

114,394 Residents

67°

North Peoria

113,004 Residents

83°

Elgin

112,111 Residents

77°

Waukegan

88,475 Residents

76°

Explore by County

Adams Alexander Bond Boone Brown Bureau Calhoun Carroll Cass Champaign Christian Clark Clay Clinton Coles Cook Crawford Cumberland DeKalb DeWitt Douglas DuPage Edgar Edwards Effingham Fayette Ford Franklin Fulton Gallatin Greene Grundy Hamilton Hancock Hardin Henderson Henry Iroquois Jackson Jasper Jefferson Jersey Jo Daviess Johnson Kane Kankakee Kendall Knox Lake LaSalle Lawrence Lee Livingston Logan Macon Macoupin Madison Marion Marshall Mason Massac McDonough McHenry McLean Menard Mercer Monroe Montgomery Morgan Moultrie Ogle Peoria Perry Piatt Pike Pope Pulaski Putnam Randolph Richland Rock Island Saint Clair Saline Sangamon Schuyler Scott Shelby Stark Stephenson Tazewell Union Vermilion Wabash Warren Washington Wayne White Whiteside Will Williamson Winnebago Woodford
Regional insight
"The region encompassing Illinois is part of a complex biosphere where prevailing winds and elevation gradients define the local habitability. In recent years, Illinois has seen a trend toward greater atmospheric volatility, making real-time monitoring not just a convenience, but a necessity for infrastructure resilience. Our platform connects Illinois to the global weather mesh, ensuring parity with the world's most advanced meteorological centers."

Source: USWeatherHub Climate Network

Live Alert Feed

Stay informed with real-time NWS weather alerts for the entire state.

Quick access

Chicago Aurora Rockford Joliet Naperville