Belleville, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Belleville, IL in one place.
Sunny, with a high near 95. Heat index values as high as 102. Southwest wind 6 to 9 mph.
Local Weather Overview
This forecast page for Belleville, 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 12, 2026 2:06 PM CDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Belleville, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 2:06 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Belleville
Tuesday looks like the warmest upcoming period in Belleville at 95 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 NW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 2:06 PM CDT
- Coverage
- 6 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 slight chance of showers and thunderstorms between 1am and 3am, then showers and thunderstorms likely. Partly cloudy, with a low around 71. Southwest wind 5 to 8 mph. Chance of precipitation is 60%.
Showers and thunderstorms. Mostly cloudy, with a high near 82. West wind around 5 mph. Chance of precipitation is 100%.
Showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 80%.
Showers and thunderstorms. Mostly cloudy, with a high near 83. Chance of precipitation is 80%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 55. Chance of precipitation is 70%.
A chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 64. Chance of precipitation is 30%.
Mostly clear, with a low around 40.
Sunny, with a high near 62.
Clear, with a low around 38.
Sunny, with a high near 70.
Mostly clear, with a low around 47.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Sunny
|
95°F |
6 to 9 mph
SW
|
|
Tuesday Night
Oct 13
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
71°F |
5 to 8 mph
SW
|
|
Wednesday
Oct 14
|
Showers And Thunderstorms
|
82°F |
5 mph
W
|
|
Wednesday Night
Oct 14
|
Showers And Thunderstorms
|
68°F |
2 mph
NE
|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
83°F |
3 to 7 mph
S
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms Likely
|
55°F |
7 to 17 mph
NW
|
|
Friday
Oct 16
|
Chance Showers And Thunderstorms then Mostly Sunny
|
64°F |
17 to 21 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
40°F |
6 to 17 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
62°F |
6 mph
NE
|
|
Saturday Night
Oct 17
|
Clear
|
38°F |
3 mph
E
|
|
Sunday
Oct 18
|
Sunny
|
70°F |
2 to 8 mph
S
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
47°F |
3 to 7 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Belleville.
