Williamson County, IL Weather Forecast
County weather hub
Mostly Sunny then 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 after 3pm. Mostly sunny. High near 80, with temperatures falling to around 78 in the afternoon. Southwest wind 8 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
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
- Apr 10 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 2:45 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Williamson County
Tuesday looks like the warmest upcoming period in Williamson County at 85 degrees F.
Friday Night is the coolest period ahead with temperatures near 57 degrees F.
The strongest winds are forecast for Monday at about 14 to 17 mph SSW.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 2:45 PM 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
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 57. North northeast wind 2 to 8 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 4pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 80. East southeast wind around 5 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 60. South southeast wind around 6 mph. Chance of precipitation is 30%.
Partly sunny, with a high near 83. South wind 6 to 16 mph, with gusts as high as 28 mph.
A slight chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South southwest wind around 13 mph, with gusts as high as 25 mph.
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South southwest wind 14 to 17 mph, with gusts as high as 29 mph.
A slight chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 68. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.
A slight chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. South southwest wind 12 to 16 mph, with gusts as high as 26 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South southwest wind around 13 mph, with gusts as high as 23 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 79. South southwest wind around 14 mph, with gusts as high as 23 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Apr 10
|
Mostly Sunny then Chance Showers And Thunderstorms
|
80°F |
8 to 13 mph
SW
|
|
Friday Night
Apr 10
|
Chance Showers And Thunderstorms
|
57°F |
2 to 8 mph
NNE
|
|
Saturday
Apr 11
|
Chance Showers And Thunderstorms
|
80°F |
5 mph
ESE
|
|
Saturday Night
Apr 11
|
Chance Showers And Thunderstorms then Partly Cloudy
|
60°F |
6 mph
SSE
|
|
Sunday
Apr 12
|
Partly Sunny
|
83°F |
6 to 16 mph
S
|
|
Sunday Night
Apr 12
|
Slight Chance Showers And Thunderstorms
|
65°F |
13 mph
SSW
|
|
Monday
Apr 13
|
Chance Showers And Thunderstorms
|
82°F |
14 to 17 mph
SSW
|
|
Monday Night
Apr 13
|
Slight Chance Showers And Thunderstorms then Mostly Cloudy
|
68°F |
10 to 14 mph
SSW
|
|
Tuesday
Apr 14
|
Slight Chance Showers And Thunderstorms
|
85°F |
12 to 16 mph
SSW
|
|
Tuesday Night
Apr 14
|
Chance Showers And Thunderstorms
|
66°F |
13 mph
SSW
|
|
Wednesday
Apr 15
|
Chance Showers And Thunderstorms
|
79°F |
14 mph
SSW
|
|
Wednesday Night
Apr 15
|
Chance Showers And Thunderstorms
|
58°F |
6 to 10 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.
