Williamson, IL Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Williamson, IL in one place.
Mostly cloudy, with a low around 62. East wind around 8 mph.
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: May 31, 2026 5:39 AM CDT.
The active forecast window currently covers May 31 to Jun 6, 2026 for Williamson, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 31 to Jun 6, 2026
- Latest sync
- May 31, 2026 5:39 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Williamson
Friday looks like the warmest upcoming period in Williamson at 86 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Friday at about 6 to 13 mph S.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- May 31, 2026 5:39 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
Partly sunny, with a high near 81. Southeast wind around 8 mph.
A chance of showers and thunderstorms before 11pm, then a chance of showers and thunderstorms between 1am and 4am, then showers and thunderstorms likely. Partly cloudy, with a low around 62. East wind 2 to 7 mph. Chance of precipitation is 70%.
Showers and thunderstorms likely before 7am, then a slight chance of showers and thunderstorms between 10am and 11am, then a chance of showers and thunderstorms between 11am and noon, then a slight chance of showers and thunderstorms between noon and 2pm. Mostly sunny, with a high near 82. East wind around 5 mph. Chance of precipitation is 60%.
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 59. Northeast wind around 6 mph. Chance of precipitation is 20%.
Sunny, with a high near 80.
Clear, with a low around 55.
Sunny, with a high near 79.
Mostly clear, with a low around 56.
Sunny, with a high near 83.
Mostly clear, with a low around 63.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
May 31
|
Mostly Cloudy
|
62°F |
8 mph
E
|
|
Sunday
May 31
|
Partly Sunny
|
81°F |
8 mph
SE
|
|
Sunday Night
May 31
|
Chance Showers And Thunderstorms
|
62°F |
2 to 7 mph
E
|
|
Monday
Jun 1
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
82°F |
5 mph
E
|
|
Monday Night
Jun 1
|
Slight Chance Showers And Thunderstorms
|
59°F |
6 mph
NE
|
|
Tuesday
Jun 2
|
Sunny
|
80°F |
6 to 12 mph
NE
|
|
Tuesday Night
Jun 2
|
Clear
|
55°F |
3 to 9 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
79°F |
7 mph
E
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
56°F |
2 to 6 mph
SE
|
|
Thursday
Jun 4
|
Sunny
|
83°F |
3 to 8 mph
S
|
|
Thursday Night
Jun 4
|
Mostly Clear
|
63°F |
8 mph
S
|
|
Friday
Jun 5
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
86°F |
6 to 13 mph
S
|
|
Friday Night
Jun 5
|
Slight Chance Showers And Thunderstorms
|
66°F |
7 to 10 mph
S
|
|
Saturday
Jun 6
|
Chance Showers And Thunderstorms
|
86°F |
7 to 10 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Williamson.