Williamsville, IL Weather Forecast
Local 7-day forecast
Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Williamsville, IL in one place.
A chance of showers and thunderstorms after 3pm. Sunny, with a high near 92. Heat index values as high as 103. West wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Williamsville, 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: Jul 17, 2026 8:40 AM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Williamsville, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 8:40 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Williamsville
Saturday looks like the warmest upcoming period in Williamsville at 92 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 61 degrees F.
The strongest winds are forecast for Tuesday at about 9 to 15 mph WNW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 8:40 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
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 chance of showers and thunderstorms between 10pm and 1am. Mostly clear, with a low around 70. North northwest wind 3 to 10 mph, with gusts as high as 17 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Sunny, with a high near 87. East northeast wind around 6 mph.
Mostly clear, with a low around 68. East southeast wind around 5 mph.
Mostly sunny, with a high near 91. South wind 5 to 9 mph.
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 75.
A slight chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 89.
Mostly clear, with a low around 65.
Sunny, with a high near 82.
Mostly clear, with a low around 61.
Sunny, with a high near 81.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Sunny then Chance Showers And Thunderstorms
|
92°F |
8 to 13 mph
W
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
70°F |
3 to 10 mph
NNW
|
|
Sunday
Jul 19
|
Sunny
|
87°F |
6 mph
ENE
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
68°F |
5 mph
ESE
|
|
Monday
Jul 20
|
Mostly Sunny
|
91°F |
5 to 9 mph
S
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
75°F |
10 mph
SSW
|
|
Tuesday
Jul 21
|
Slight Chance Showers And Thunderstorms then Mostly Sunny
|
89°F |
9 to 15 mph
WNW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
65°F |
7 to 13 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
82°F |
9 mph
NNE
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
61°F |
3 to 8 mph
NE
|
|
Thursday
Jul 23
|
Sunny
|
81°F |
3 to 7 mph
E
|
|
Thursday Night
Jul 23
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
63°F |
6 mph
ESE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Williamsville.
