Local weather forecast

Weather in Belleville, IL

Updated 2026-08-11 11:00 local time · ZIP codes 62220, 62221, 62223, 62226

Sunny
Now88°F

Sunny

High / Low102° / 77°
Rain chance3%
Wind12 mph
Weather alerts

Active alerts

1
Extreme Heat Warning issued August 11 at 2:17AM CDT until August 12 at 8:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 111. * WHERE...Portions of south central and southwest Illinois and central and east central Missouri. * WHEN...Until 8 PM CDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Safety instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668.

Hourly

Next hours

NowSunny88°1% rain
12 PMSunny100°1% rain
1 PMSunny102°1% rain
2 PMSunny102°1% rain
3 PMSunny102°1% rain
4 PMSunny102°1% rain
5 PMSunny99°1% rain
6 PMSunny96°1% rain
7 PMSunny93°2% rain
8 PMClear88°3% rain
9 PMClear86°4% rain
10 PMClear84°5% rain
Forecast

3-day weather forecast

Today2026-08-11
Sunny
102° 77°Sunny
Rain 3%Gust 13 mph
Tomorrow2026-08-12
Sunny
96° 77°Sunny
Rain 4%Gust 9 mph
Thursday2026-08-13
Sunny
102° 74°Sunny
Rain 60%Gust 16 mph
Conditions

Weather details

Feels like91°F
Humidity70%
Pressure29.97 inHg
Visibility10 mi
Wind12 mph SW
Wind gusts15 mph
Precipitation0.00 in
UV index6
Daylight

Sunrise, sunset and moon

Sunrise06:10 AM
Sunset07:59 PM
Moonrise04:14 AM
Moon phaseNew Moon
Practical guide

Weather insights for today

Umbrella not essential

Rain chance stays relatively low over the next 12 hours (up to 5%).

Choose light, breathable clothing

It feels like 91°F with winds near 12 mph.

Best window: 11 AM

88°F, 1% rain chance and 12 mph wind.

Driving conditions look generally normal

Visibility is around 10 mi; gusts may reach 18 mph.

Running conditions are less comfortable

Current temperature is 88°F, wind 12 mph, rain chance up to 5%.

Moderate UV protection recommended

UV index is 6. Sunscreen and sunglasses are sensible for longer outdoor time.

Belleville weather today

Sunny and 88°F in Belleville, IL. Today's high is 102°F with a 3% rain chance. Winds are around 12 mph with gusts near 15 mph. Relative humidity is 70%, pressure is 29.97 inHg, and visibility is about 10 miles.

Tonight and tomorrow in Belleville

Sunrise is at 06:10 AM and sunset is at 07:59 PM. Tomorrow's forecast calls for Sunny with a high near 96°F and a low near 77°F. The maximum rain chance is 4%.

Nearby

Weather near Belleville

Illinois

Popular cities in Illinois

View state page →