Williamson County, IL Weather Forecast
County weather hub
Sunny
Compare major city weather across Williamson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 86. East wind 1 to 5 mph.
County Weather Overview
This county weather page brings together forecast coverage for Williamson County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 5 of 5 mapped cities in Williamson County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 25 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 1:03 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Williamson County
Wednesday looks like the warmest upcoming period in Williamson County at 89 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Thursday at about 0 to 9 mph NW.
The forecast from Aug 25 through Aug 29 stays mostly dry.
Forecast Details
- Last updated
- Aug 23, 2026 1:03 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KPAH
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 65. East northeast wind 0 to 5 mph.
Mostly sunny, with a high near 89. Southwest wind 0 to 5 mph.
Mostly clear, with a low around 67. North wind around 2 mph.
Sunny, with a high near 89. Northwest wind 0 to 9 mph.
Mostly clear, with a low around 66. North wind 0 to 6 mph.
Sunny, with a high near 88. North wind 0 to 6 mph.
Mostly clear, with a low around 65. Northeast wind 1 to 5 mph.
Sunny, with a high near 88. South southeast wind 1 to 6 mph.
Partly cloudy, with a low around 66. Southeast wind 1 to 5 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Aug 25
|
Sunny
|
86°F |
1 to 5 mph
E
|
|
Tuesday Night
Aug 25
|
Mostly Clear
|
65°F |
0 to 5 mph
ENE
|
|
Wednesday
Aug 26
|
Mostly Sunny
|
89°F |
0 to 5 mph
SW
|
|
Wednesday Night
Aug 26
|
Mostly Clear
|
67°F |
2 mph
N
|
|
Thursday
Aug 27
|
Sunny
|
89°F |
0 to 9 mph
NW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
66°F |
0 to 6 mph
N
|
|
Friday
Aug 28
|
Sunny
|
88°F |
0 to 6 mph
N
|
|
Friday Night
Aug 28
|
Mostly Clear
|
65°F |
1 to 5 mph
NE
|
|
Saturday
Aug 29
|
Sunny
|
88°F |
1 to 6 mph
SSE
|
|
Saturday Night
Aug 29
|
Partly Cloudy
|
66°F |
1 to 5 mph
SE
|
Major City Forecasts
Live forecast snapshots for major cities across Williamson County.
Coverage
Forecast coverage currently spans 5 of 5 mapped cities in Williamson County.
Largest mapped city population in this region: 17,803.
