Summerville, Illinois Weather
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Weather Forecast for Summerville, Illinois : Macoupin County
Issued: 1:22 pm CDT Jun 2, 2025 Latitude: 39.1889353 Longitude: -90.1237203 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Tuesday Wednesday Thursday Friday Saturday Sunday
Mostly Sunny on This Afternoon Cloudy on Tonight 20% chance of thunderstorms on Tuesday 80% chance of thunderstorms on Wednesday 50% chance of thunderstorms on Thursday 50% chance of thunderstorms on Friday 30% chance of rain on Saturday 50% chance of thunderstorms on Sunday
High: 86°F Low: 66°F High: 87°F High: 78°F High: 80°F High: 80°F High: 79°F High: 79°F
Low: 68°F Low: 63°F Low: 65°F Low: 62°F Low: 63°F  
Mostly Sunny Cloudy Thunderstorms Thunderstorms Thunderstorms Thunderstorms Rain Thunderstorms
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Current Conditions at
ALTON - (KALN)
81°
Clear
as of 12:50 PM CDST
Rel. Humidity: 57%
Dew Point: 64°F
Visibility: 10 Miles
Pressure: 30.00 in.
Flight Rule: VFR
Wind Data
9 MPH
160° South
Cloud Level(s): Clear
Current Conditions at
ST CHARLES - (KSET)
82°
Clear
as of 12:54 PM CDST
Rel. Humidity: 51%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 29.97 in.
Flight Rule: VFR
Wind Data
9 MPH
140° Southeast
Cloud Level(s): Clear
Current Conditions at
LITCHFIELD MUNI ARP - (K3LF)
81°
Clear
as of 1:15 PM CDST
Rel. Humidity: 47%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 30.01 in.
Flight Rule: VFR
Wind Data
12 MPH
150° Southeast
Cloud Level(s): Clear
Current Conditions at
ST LOUIS - (KSTL)
82°
Cloudy
as of 12:51 PM CDST
Rel. Humidity: 54%
Dew Point: 64°F
Visibility: 10 Miles
Pressure: 29.99 in.
Flight Rule: VFR
Wind Data
8 MPH
160° South
Cloud Level(s): Few at 6000ft, Solid Overcast at 20000ft
Mostly Sunny on This Afternoon This Afternoon... Mostly sunny, with a high near 86. South wind 8 to 10 mph.
Cloudy on Tonight Tonight... Partly cloudy, with a low around 66. South wind around 10 mph.
20% chance of thunderstorms Tuesday Tuesday... A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Partly sunny, with a high near 87. South wind 11 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
50% chance of thunderstorms Tuesday Night Tuesday Night... A chance of showers, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 68. South wind 9 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
80% chance of thunderstorms Wednesday Wednesday... Showers and possibly a thunderstorm. High near 78. Southwest wind 8 to 10 mph. Chance of precipitation is 80%.
60% chance of thunderstorms Wednesday Night Wednesday Night... Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
50% chance of thunderstorms Thursday Thursday... A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
50% chance of thunderstorms Thursday Night Thursday Night... A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
50% chance of thunderstorms Friday Friday... A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
30% chance of thunderstorms Friday Night Friday Night... A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
30% chance of rain Saturday Saturday... A 30 percent chance of showers. Mostly sunny, with a high near 79.
30% chance of thunderstorms Saturday Night Saturday Night... A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
50% chance of thunderstorms Sunday Sunday... A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Current Radar Image


Sun Almanac for Summerville, Illinois
Sunrise: 05:36 AM
Sunset: 8:22 PM
Civil Sunrise:05:04 AM
Civil Sunset: 8:53 PM
Nautical Sunrise: 04:24 AM
Nautical Sunset: 9:33 PM
Astro Sunrise: 03:39 AM
Astro Sunset: 10:18 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.