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 90. Northeast wind around 8 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: Jul 14, 2026 5:50 PM CDT.
The active forecast window currently covers Jul 14 to Jul 20, 2026 for Belleville, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 14 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 5:50 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Belleville
Monday looks like the warmest upcoming period in Belleville at 95 degrees F.
Tonight is the coolest period ahead with temperatures near 71 degrees F.
The strongest winds are forecast for Saturday at about 6 to 9 mph W.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 5:50 PM 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
Mostly clear, with a low around 71. Northeast wind 1 to 7 mph.
Sunny, with a high near 91. Heat index values as high as 100. East wind 0 to 6 mph.
Mostly clear, with a low around 73. Southeast wind 0 to 5 mph.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. South wind 0 to 5 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 74. Chance of precipitation is 50%.
A chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 92. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74. Chance of precipitation is 50%.
Sunny, with a high near 94.
Mostly clear, with a low around 75.
Sunny, with a high near 94.
Mostly clear, with a low around 74.
Sunny, with a high near 95.
Partly cloudy, with a low around 75.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Jul 14
|
Sunny
|
90°F |
8 mph
NE
|
|
Tonight
Jul 14
|
Mostly Clear
|
71°F |
1 to 7 mph
NE
|
|
Wednesday
Jul 15
|
Sunny
|
91°F |
0 to 6 mph
E
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
73°F |
0 to 5 mph
SE
|
|
Thursday
Jul 16
|
Mostly Sunny then Chance Showers And Thunderstorms
|
91°F |
0 to 5 mph
S
|
|
Thursday Night
Jul 16
|
Chance Showers And Thunderstorms then Partly Cloudy
|
74°F |
3 mph
SW
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
92°F |
2 to 7 mph
W
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms
|
74°F |
2 to 6 mph
W
|
|
Saturday
Jul 18
|
Sunny
|
94°F |
6 to 9 mph
W
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
75°F |
5 to 8 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
94°F |
8 mph
W
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
74°F |
6 mph
SW
|
|
Monday
Jul 20
|
Sunny
|
95°F |
6 to 9 mph
W
|
|
Monday Night
Jul 20
|
Partly Cloudy
|
75°F |
7 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Belleville.
