Illinois Weather Forecast
State weather hub
Sunny
Compare major city weather across Illinois, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 81. East wind 0 to 8 mph.
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
- May 25 to May 31, 2026
- Latest sync
- May 25, 2026 8:44 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Illinois
Thursday looks like the warmest upcoming period in Illinois at 85 degrees F.
Tonight is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Thursday at about 7 to 13 mph ENE.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- May 25, 2026 8:44 AM CDT
- Coverage
- 7 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. Southeast wind 3 to 7 mph.
Partly sunny, with a high near 83. East southeast wind 3 to 7 mph.
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 63. East southeast wind around 6 mph. New rainfall amounts less than a tenth of an inch possible.
A slight chance of rain showers before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 81. East wind 5 to 8 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 62. East wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Mostly sunny, with a high near 85. East northeast wind 7 to 13 mph, with gusts as high as 17 mph.
Partly cloudy, with a low around 62.
A slight chance of rain showers between 7am and 1pm. Partly sunny, with a high near 79.
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 60.
A slight chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 77.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 57.
Mostly sunny, with a high near 78.
Partly cloudy, with a low around 57.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Memorial Day
May 25
|
Sunny
|
81°F |
0 to 8 mph
E
|
|
Tonight
May 25
|
Partly Cloudy
|
56°F |
3 to 7 mph
SE
|
|
Tuesday
May 26
|
Partly Sunny
|
83°F |
3 to 7 mph
ESE
|
|
Tuesday Night
May 26
|
Mostly Cloudy then Slight Chance Rain Showers
|
63°F |
6 mph
ESE
|
|
Wednesday
May 27
|
Chance Showers And Thunderstorms
|
81°F |
5 to 8 mph
E
|
|
Wednesday Night
May 27
|
Chance Showers And Thunderstorms then Partly Cloudy
|
62°F |
7 mph
E
|
|
Thursday
May 28
|
Mostly Sunny
|
85°F |
7 to 13 mph
ENE
|
|
Thursday Night
May 28
|
Partly Cloudy
|
62°F |
10 mph
E
|
|
Friday
May 29
|
Slight Chance Rain Showers
|
79°F |
10 mph
ESE
|
|
Friday Night
May 29
|
Mostly Cloudy then Slight Chance Rain Showers
|
60°F |
9 mph
E
|
|
Saturday
May 30
|
Slight Chance Showers And Thunderstorms
|
77°F |
8 to 13 mph
E
|
|
Saturday Night
May 30
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
57°F |
8 to 12 mph
ENE
|
|
Sunday
May 31
|
Mostly Sunny
|
78°F |
9 to 13 mph
NE
|
|
Sunday Night
May 31
|
Partly Cloudy
|
57°F |
10 mph
NE
|
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.
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