Illinois Weather Forecast
State weather hub
Mostly Sunny
Compare major city weather across Illinois, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly sunny, with a high near 74.
State Weather Overview
This state weather page brings together forecast coverage for Illinois so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 189 of 189 mapped cities in Illinois.
Page Snapshot
- Page focus
- state weather
- Forecast window
- Sep 23 to Sep 24, 2026
- Latest sync
- Sep 17, 2026 9:56 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Illinois
Thursday looks like the warmest upcoming period in Illinois at 77 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Wednesday at about 10 mph NE.
The forecast from Sep 23 through Sep 24 stays mostly dry.
Forecast Details
- Last updated
- Sep 17, 2026 9:56 PM CDT
- Coverage
- 2 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 56.
Mostly sunny, with a high near 77.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 23
|
Mostly Sunny
|
74°F |
10 mph
NE
|
|
Wednesday Night
Sep 23
|
Partly Cloudy
|
56°F |
5 to 10 mph
NE
|
|
Thursday
Sep 24
|
Mostly Sunny
|
77°F |
5 to 9 mph
NNE
|
Major City Forecasts
Live forecast snapshots for major cities across Illinois.
Coverage
Forecast coverage currently spans 189 of 189 mapped cities in Illinois.
Largest mapped city population in this region: 2,677,643.
Region Links
