Belleville, IL Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Belleville, IL.

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Current Conditions — Belleville, IL

ALTON/ST LOUIS R (KALN)

Clear

60.6 F
Humidity:%
Wind Speed:SW 6.9 mph
Barometer: in
Dewpoint: F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 22 2026, 05:15 AM CDT
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5-Day Forecast — Belleville, IL

Wednesday

High 80 °F
Partly Sunny
Wednesday
Night
Low 57 °F
Mostly Clear
Thursday

High 82 °F
Partly Sunny
Thursday
Night
Low 64 °F
T-storms Likely
Friday

High 77 °F
T-storms
Friday
Night
Low 57 °F
Chance of Rain
Saturday

High 77 °F
Partly Sunny
Saturday
Night
Low 53 °F
Slight Chance of Showers
Sunday

High 77 °F
Isolated T-storm

Detailed Forecast — Belleville, IL

Wednesday
Partly Sunny. High near 80°F. Wind 6 to 9 mph, with gusts as high as 15 mph.
Wednesday Night
Mostly Clear. Low around 57°F. Wind 5 to 6 mph, with gusts as high as 13 mph.
Thursday
Partly Sunny. High near 82°F. Wind 7 to 16 mph, with gusts as high as 26 mph.
Thursday Night
Thunderstorms Likely. Low around 64°F. Wind 10 to 12 mph, with gusts as high as 21 mph.
Friday
Thunderstorms. High near 77°F. Wind 6 to 12 mph, with gusts as high as 20 mph.
Friday Night
Chance of Rain. Low around 57°F. Wind around 3 mph, with gusts as high as 8 mph.
Saturday
Partly Sunny. High near 77°F. Wind 5 to 8 mph, with gusts as high as 13 mph.
Saturday Night
Slight Chance of Showers. Low around 53°F. Wind around 5 mph, with gusts as high as 9 mph.
Sunday
Isolated T-storm. High near 77°F. Wind 9 to 10 mph, with gusts as high as 16 mph.
Sunday Night
Chance of Thunderstorms. Low around 60°F. Wind around 12 mph, with gusts as high as 20 mph.
Monday
Thunderstorms Likely. High near 77°F. Wind 13 to 14 mph, with gusts as high as 23 mph.
Monday Night
Chance of Showers. Low around 53°F. Wind around 9 mph, with gusts as high as 17 mph.
Tuesday
Partly Sunny. High near 73°F. Wind 6 to 12 mph, with gusts as high as 18 mph.
IL Radar
Current Radar • IL
Day 1 Outlook • April 22, 2026

Observation History — Belleville, IL

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
05:15 AM CDT SW 6.9 10.00 Clear -- 60.6 % NA NA M
04:55 AM CDT SW 8.1 10.00 Clear -- 60.8 % NA NA M
04:35 AM CDT SW 8.1 10.00 Clear -- 61.3 % NA NA M
04:15 AM CDT SW 6.9 10.00 Clear -- 61.5 % NA NA M
03:55 AM CDT SW 8.1 10.00 Clear -- 61.7 % NA NA M
03:35 AM CDT SW 6.9 10.00 Clear -- 62.1 % NA NA M
03:15 AM CDT SW 6.9 10.00 Partly Cloudy -- 63.0 % NA NA M
02:55 AM CDT SW 8.1 10.00 Mostly Cloudy -- 63.7 % NA NA M
02:35 AM CDT SW 9.2 10.00 Cloudy -- 64.9 % NA NA M
02:15 AM CDT SW 9.2 10.00 Cloudy -- 64.9 % NA NA M
01:55 AM CDT SW 8.1 10.00 Mostly Cloudy -- 65.7 % NA NA M
01:35 AM CDT SW 8.1 10.00 Partly Cloudy -- 65.8 % NA NA M
01:15 AM CDT SW 9.2 10.00 Clear -- 65.3 % NA NA M
12:55 AM CDT SW 6.9 10.00 Clear -- 66.6 % NA NA M
12:35 AM CDT SW 8.1 10.00 Clear -- 67.1 % NA NA M
12:15 AM CDT 10.00 Clear -- NULL % NA NA M
11:55 PM CDT SW 9.2 10.00 Clear -- 68.7 % NA NA M
11:35 PM CDT SW 10.4 10.00 Clear -- 69.3 % NA NA M
11:15 PM CDT SW 10.4 10.00 Clear -- 68.9 % NA NA M
10:55 PM CDT SW 11.4 G 16.1 10.00 Clear -- 69.8 % NA NA M
10:35 PM CDT SW 13.9 10.00 Clear -- 70.9 % NA NA M
10:15 PM CDT SW 9.2 10.00 Clear -- 70.0 % NA NA M
09:50 PM CDT SW 8.1 10.00 Clear -- 71.6 % NA NA M
08:50 PM CDT SW 9.2 G 17.2 10.00 Clear -- 73.4 % NA NA M

Regional Weather Observation

ALTON/ST LOUIS R (KALN)

Clear
60.6 F

ST LOUIS (KSTL)

Clear
60.8 F

CAHOKIA/ST LOUIS (KCPS)

Clear
60.8 F

ST CHARLES (KSET)

Clear
57.2 F

ST LOUIS/SPIRIT (KSUS)

Clear
60.8 F

SCOTT AFB/BELLEV (KBLV)

Clear
58.3 F
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