Williamson, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Williamson, IL in one place.
Showers and thunderstorms. Mostly cloudy, with a high near 77. Northwest wind around 6 mph. Chance of precipitation is 80%.
Local Weather Overview
This forecast page for Williamson, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 14, 2026 8:43 AM CDT.
The active forecast window currently covers Oct 14 to Oct 20, 2026 for Williamson, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 14 to Oct 20, 2026
- Latest sync
- Oct 14, 2026 8:43 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Williamson
Thursday looks like the warmest upcoming period in Williamson at 81 degrees F.
Saturday Night is the coolest period ahead with temperatures near 36 degrees F.
The strongest winds are forecast for Friday at about 20 to 23 mph NW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 14, 2026 8:43 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
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 10pm, then a slight chance of showers and thunderstorms between 10pm and midnight, then a chance of showers and thunderstorms between midnight and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Northeast wind around 7 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms. Mostly cloudy, with a high near 81. Southeast wind 7 to 10 mph. Chance of precipitation is 80%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 46. West wind 7 to 20 mph. Chance of precipitation is 80%.
A chance of rain showers before 7am. Partly sunny, with a high near 59. Northwest wind 20 to 23 mph. Chance of precipitation is 30%.
Mostly clear, with a low around 37.
Sunny, with a high near 62.
Clear, with a low around 36.
Sunny, with a high near 70.
Partly cloudy, with a low around 42.
Mostly sunny, with a high near 72.
Partly cloudy, with a low around 46.
Mostly sunny, with a high near 77.
Mostly clear, with a low around 50.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Oct 14
|
Showers And Thunderstorms
|
77°F |
6 mph
NW
|
|
Tonight
Oct 14
|
Chance Showers And Thunderstorms
|
63°F |
7 mph
NE
|
|
Thursday
Oct 15
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
81°F |
7 to 10 mph
SE
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms Likely
|
46°F |
7 to 20 mph
W
|
|
Friday
Oct 16
|
Chance Rain Showers then Partly Sunny
|
59°F |
20 to 23 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
37°F |
2 to 17 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
62°F |
0 to 3 mph
E
|
|
Saturday Night
Oct 17
|
Clear
|
36°F |
2 mph
SE
|
|
Sunday
Oct 18
|
Sunny
|
70°F |
2 to 8 mph
S
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
42°F |
2 to 7 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
72°F |
2 to 6 mph
S
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
46°F |
0 to 3 mph
SE
|
|
Tuesday
Oct 20
|
Mostly Sunny
|
77°F |
0 to 5 mph
SE
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
50°F |
3 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Williamson.