Williamson County, IL Weather Forecast
County weather hub
Chance 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.
A chance of showers and thunderstorms before 1pm, then showers and thunderstorms likely. Partly sunny, with a high near 87. West wind 0 to 5 mph. Chance of precipitation is 60%.
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
- Jul 11 to Jul 16, 2026
- Latest sync
- Jul 10, 2026 2:38 AM 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 91 degrees F.
Sunday Night is the coolest period ahead with temperatures near 68 degrees F.
The strongest winds are forecast for Monday at about 2 to 9 mph NE.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 10, 2026 2:38 AM CDT
- Coverage
- 6 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 likely before 7pm, then a chance of showers and thunderstorms between 7pm and 10pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69. North northwest wind 0 to 3 mph. Chance of precipitation is 60%.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 86. North northeast wind 0 to 8 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 68. Northeast wind 0 to 6 mph.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Northeast wind 2 to 9 mph.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 69. Northeast wind 0 to 7 mph.
Sunny, with a high near 89. East wind 0 to 7 mph.
Mostly clear, with a low around 70. East northeast wind 0 to 5 mph.
Sunny, with a high near 91. South southwest wind 0 to 5 mph.
Mostly clear, with a low around 71. Southwest wind 0 to 3 mph.
Sunny, with a high near 91. Southwest wind 0 to 7 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 11
|
Chance Showers And Thunderstorms
|
87°F |
0 to 5 mph
W
|
|
Saturday Night
Jul 11
|
Showers And Thunderstorms Likely
|
69°F |
0 to 3 mph
NNW
|
|
Sunday
Jul 12
|
Chance Rain Showers
|
86°F |
0 to 8 mph
NNE
|
|
Sunday Night
Jul 12
|
Chance Showers And Thunderstorms
|
68°F |
0 to 6 mph
NE
|
|
Monday
Jul 13
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
88°F |
2 to 9 mph
NE
|
|
Monday Night
Jul 13
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
69°F |
0 to 7 mph
NE
|
|
Tuesday
Jul 14
|
Sunny
|
89°F |
0 to 7 mph
E
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
70°F |
0 to 5 mph
ENE
|
|
Wednesday
Jul 15
|
Sunny
|
91°F |
0 to 5 mph
SSW
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
71°F |
0 to 3 mph
SW
|
|
Thursday
Jul 16
|
Sunny
|
91°F |
0 to 7 mph
SW
|
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.
