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Summit, Illinois Weather Forecast
Summit, Illinois Weather
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Weather Forecast for Summit, Illinois : St. Clair County
Issued: 4:36 am CST Nov 5, 2025 Latitude: 38.5511613 Longitude: -90.0048273 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Thursday Friday Saturday Sunday Monday Veterans Day
Sunny on Today Clear on Tonight Sunny on Thursday 30% chance of rain on Friday Mostly Sunny on Saturday Mostly Sunny on Sunday Sunny on Monday Mostly Sunny on Veterans Day
High: 70°F Low: 37°F High: 65°F High: 73°F High: 67°F High: 45°F High: 44°F High: 55°F
Low: 54°F Low: 44°F Low: 38°F Low: 25°F Low: 28°F  
Sunny Clear Sunny Rain Mostly Sunny Mostly Sunny Sunny Mostly Sunny
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Current Conditions at
EAST ST LOUIS - (KCPS)
57°
Clear
as of 5:53 AM CST
Rel. Humidity: 67%
Dew Point: 46°F
Visibility: 10 Miles
Pressure: 30.00 in.
Flight Rule: VFR
Wind Data
8 MPH
220° Southwest
Cloud Level(s): Clear
Current Conditions at
SCOTT AFB - (KBLV)
52°
Clear
as of 5:55 AM CST
Rel. Humidity: 81%
Dew Point: 46°F
Visibility: 10 Miles
Pressure: 29.99 in.
Flight Rule: VFR
Wind Data
6 MPH
230° Southwest
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
59°
Mostly Cloudy
as of 5:51 AM CST
Rel. Humidity: 58%
Dew Point: 45°F
Visibility: 10 Miles
Pressure: 29.99 in.
Flight Rule: VFR
Wind Data
16 MPH
240° Southwest
Cloud Level(s): Broken at 25000ft
Current Conditions at
SPARTA - (KSAR)
55°
Clear
as of 5:55 AM CST
Rel. Humidity: 71%
Dew Point: 46°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
8 MPH
200° South
Cloud Level(s): Clear
Sunny on Today Today... Sunny, with a high near 70. Southwest wind 9 to 14 mph becoming north in the afternoon. Winds could gust as high as 24 mph.

Clear on Tonight Tonight... Clear, with a low around 37. North wind 5 to 7 mph becoming east after midnight.

Sunny on Thursday Thursday... Sunny, with a high near 65. Southeast wind 5 to 13 mph, with gusts as high as 20 mph.

30% chance of rain Thursday Night Thursday Night... A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 54. Southeast wind 8 to 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

30% chance of rain Friday Friday... A 30 percent chance of rain before noon. Mostly sunny, with a high near 73. Southwest wind 7 to 10 mph becoming west in the afternoon.

Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 44.

Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 67.

20% chance of rain Saturday Night Saturday Night... A 20 percent chance of rain before midnight. Partly cloudy, with a low around 38.

Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 45.

Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 25.

Sunny on Monday Monday... Sunny, with a high near 44.

Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 28.

Mostly Sunny on Veterans Day Veterans Day... Mostly sunny, with a high near 55.

Current Radar Image


Sun Almanac for Summit, Illinois
Sunrise: 06:32 AM
Sunset: 4:56 PM
Civil Sunrise:06:04 AM
Civil Sunset: 5:23 PM
Nautical Sunrise: 05:32 AM
Nautical Sunset: 5:55 PM
Astro Sunrise: 05:01 AM
Astro Sunset: 6:26 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.