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. High near 92, with temperatures falling to around 90 in the afternoon. Southwest wind around 12 mph, with gusts as high as 18 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
- Oct 13 to Oct 19, 2026
- Latest sync
- Oct 13, 2026 4:15 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Williamson County
This Afternoon looks like the warmest upcoming period in Williamson County at 92 degrees F.
Saturday Night is the coolest period ahead with temperatures near 38 degrees F.
The strongest winds are forecast for Friday at about 17 to 21 mph NNW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 13, 2026 4:15 PM CDT
- Coverage
- 7 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 slight chance of showers and thunderstorms after 4am. Mostly clear, with a low around 73. South southwest wind 3 to 7 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms before 8am, then showers and thunderstorms between 8am and 3pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 83, with temperatures falling to around 79 in the afternoon. West southwest wind 5 to 8 mph. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms between 7pm and 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers and thunderstorms likely. Mostly cloudy, with a low around 68. North wind 0 to 3 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely. Mostly sunny, with a high near 87. South southwest wind 0 to 12 mph. Chance of precipitation is 60%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 53. West wind 7 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
A chance of rain showers before 7am. Mostly sunny, with a high near 63. North northwest wind 17 to 21 mph, with gusts as high as 30 mph.
Mostly clear, with a low around 39. North wind 5 to 16 mph, with gusts as high as 24 mph.
Sunny, with a high near 62. Northeast wind 3 to 7 mph.
Clear, with a low around 38. East wind 0 to 3 mph.
Sunny, with a high near 69. South southeast wind 1 to 7 mph.
Partly cloudy, with a low around 45. South wind around 3 mph.
Mostly sunny, with a high near 73. South wind 3 to 8 mph.
Partly cloudy, with a low around 50. East southeast wind around 2 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Oct 13
|
Sunny
|
92°F |
12 mph
SW
|
|
Tonight
Oct 13
|
Mostly Clear then Slight Chance Showers And Thunderstorms
|
73°F |
3 to 7 mph
SSW
|
|
Wednesday
Oct 14
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
83°F |
5 to 8 mph
WSW
|
|
Wednesday Night
Oct 14
|
Chance Showers And Thunderstorms
|
68°F |
0 to 3 mph
N
|
|
Thursday
Oct 15
|
Showers And Thunderstorms Likely
|
87°F |
0 to 12 mph
SSW
|
|
Thursday Night
Oct 15
|
Chance Showers And Thunderstorms
|
53°F |
7 to 16 mph
W
|
|
Friday
Oct 16
|
Chance Rain Showers then Mostly Sunny
|
63°F |
17 to 21 mph
NNW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
39°F |
5 to 16 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
62°F |
3 to 7 mph
NE
|
|
Saturday Night
Oct 17
|
Clear
|
38°F |
0 to 3 mph
E
|
|
Sunday
Oct 18
|
Sunny
|
69°F |
1 to 7 mph
SSE
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
45°F |
3 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
73°F |
3 to 8 mph
S
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
50°F |
2 mph
ESE
|
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.
