Williamson County, IL Weather Forecast
County weather hub
Showers And Thunderstorms
Compare major city weather across Williamson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Showers and thunderstorms. Mostly cloudy, with a high near 80. Southeast wind 2 to 6 mph. Chance of precipitation is 90%.
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
- May 26 to May 30, 2026
- Latest sync
- May 24, 2026 3:03 AM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Williamson County
Thursday looks like the warmest upcoming period in Williamson County at 84 degrees F.
Friday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Saturday at about 6 to 10 mph NE.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 3:03 AM 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
Showers and thunderstorms. Mostly cloudy, with a low around 67. South southeast wind around 6 mph.
A chance of rain showers before 7am, then showers and thunderstorms likely. Partly sunny, with a high near 82. South wind around 7 mph.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 68. South southeast wind 0 to 5 mph.
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms between 7am and 1pm, then showers and thunderstorms likely. Partly sunny, with a high near 84. South southeast wind around 3 mph.
Showers and thunderstorms likely before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. East wind around 2 mph.
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 79. East northeast wind 2 to 8 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. East northeast wind around 7 mph.
A slight chance of rain showers. Mostly sunny, with a high near 79. Northeast wind 6 to 10 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Showers And Thunderstorms
|
80°F |
2 to 6 mph
SE
|
|
Tuesday Night
May 26
|
Showers And Thunderstorms
|
67°F |
6 mph
SSE
|
|
Wednesday
May 27
|
Showers And Thunderstorms Likely
|
82°F |
7 mph
S
|
|
Wednesday Night
May 27
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
68°F |
0 to 5 mph
SSE
|
|
Thursday
May 28
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
84°F |
3 mph
SSE
|
|
Thursday Night
May 28
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
66°F |
2 mph
E
|
|
Friday
May 29
|
Chance Showers And Thunderstorms
|
79°F |
2 to 8 mph
ENE
|
|
Friday Night
May 29
|
Chance Showers And Thunderstorms
|
62°F |
7 mph
ENE
|
|
Saturday
May 30
|
Slight Chance Rain Showers
|
79°F |
6 to 10 mph
NE
|
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.
