Summit, Illinois Weather
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Weather Forecast for Summit, Illinois : St. Clair County
Issued: 3:22 am CDT Jun 4, 2025 Latitude: 38.5511613 Longitude: -90.0048273 View on Google Maps

MouseOver for Detail Forecast
Overnight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
40% chance of thunderstorms on Overnight 80% chance of thunderstorms on Wednesday 40% chance of thunderstorms on Thursday 70% chance of thunderstorms on Friday 20% chance of rain on Saturday 30% chance of thunderstorms on Sunday 20% chance of thunderstorms on Monday Sunny on Tuesday
Low: 70°F High: 80°F High: 80°F High: 80°F High: 81°F High: 84°F High: 82°F High: 82°F
Low: 68°F Low: 68°F Low: 65°F Low: 62°F Low: 65°F Low: 61°F  
Thunderstorms Thunderstorms Thunderstorms Thunderstorms Rain Thunderstorms Thunderstorms Sunny
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Current Conditions at
EAST ST LOUIS - (KCPS)
68°
Cloudy
as of 4:53 AM CDST
Rel. Humidity: 93%
Dew Point: 66°F
Visibility: 10 Miles
Pressure: 29.94 in.
Flight Rule: VFR
Wind Data
3 MPH
140° Southeast
Cloud Level(s): Solid Overcast at 4500ft
Current Conditions at
SCOTT AFB - (KBLV)
72°
Mostly Cloudy
as of 4:55 AM CDST
Rel. Humidity: 88%
Dew Point: 68°F
Visibility: 10 Miles
Pressure: 29.94 in.
Flight Rule: VFR
Wind Data
5 MPH
230° Southwest
Cloud Level(s): Broken at 4000ft
Current Conditions at
ST LOUIS - (KSTL)
70°
Cloudy
Light Rain
as of 4:51 AM CDST
Rel. Humidity: 83%
Dew Point: 64°F
Visibility: 10 Miles
Pressure: 29.94 in.
Flight Rule: VFR
Wind Data
6 MPH
170° South
Cloud Level(s): Broken at 5500ft, Solid Overcast at 7000ft
Current Conditions at
SPARTA - (KSAR)
75°
Cloudy
as of 4:55 AM CDST
Rel. Humidity: 78%
Dew Point: 68°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 2900ft, Solid Overcast at 4300ft
40% chance of thunderstorms Overnight Overnight... A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South wind around 8 mph.
80% chance of thunderstorms Wednesday Wednesday... Showers and thunderstorms likely, then showers and possibly a thunderstorm after noon. High near 80. Southwest wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
70% chance of thunderstorms Wednesday Night Wednesday Night... Showers and thunderstorms likely before 10pm, then showers likely and possibly a thunderstorm between 10pm and 2am, then a chance of showers and thunderstorms after 2am. Cloudy, with a low around 68. West wind around 6 mph becoming north after midnight. Chance of precipitation is 70%.
40% chance of thunderstorms Thursday Thursday... A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 80. North wind around 6 mph.
40% chance of thunderstorms Thursday Night Thursday Night... A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Light and variable wind.
70% chance of thunderstorms Friday Friday... Showers likely and possibly a thunderstorm before 7am, then showers likely between 7am and 10am, then showers likely and possibly a thunderstorm after 10am. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.
30% chance of thunderstorms Friday Night Friday Night... A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
20% chance of rain Saturday Saturday... A 20 percent chance of showers. Mostly sunny, with a high near 81.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 62.
30% chance of thunderstorms Sunday Sunday... A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84.
20% chance of thunderstorms Sunday Night Sunday Night... A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 65.
20% chance of thunderstorms Monday Monday... A 20 percent chance of showers and thunderstorms. Sunny, with a high near 82.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 61.
Sunny on Tuesday Tuesday... Sunny, with a high near 82.
Current Radar Image


Sun Almanac for Summit, Illinois
Sunrise: 05:36 AM
Sunset: 8:21 PM
Civil Sunrise:05:05 AM
Civil Sunset: 8:52 PM
Nautical Sunrise: 04:26 AM
Nautical Sunset: 9:31 PM
Astro Sunrise: 03:41 AM
Astro Sunset: 10:16 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.