Weather Alert
Summit Weather Warning NWS WEATHER ALERT FOR THE SUMMIT, IL AREA - Issued: 301 PM CDT Sat Sep 5 2026 Summit Weather Warning

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Summit, IL Weather Forecast

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Summit, IL Weather Forecast

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Summit IL weather - Mostly Cloudy - 80°F
Mostly Cloudy
80°F
Updated 5:34 pm
Feels Like 81°F
Humidity 69%
Wind NNE 12 mph
Barometer  29.97 in
Dew Point 69°F
Summit IL weather - Mostly Cloudy - 27°C
Mostly Cloudy
27°C
Updated 5:34 pm
Feels Like 27°C
Humidity 69%
Wind NNE 19 km/h
Barometer  101.5 kPa
Dew Point 21°C
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Summit Weather Forecast

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Summit, IL Weather - Late This Afternoon Mostly Cloudy Summit, IL Weather - Tonight Partly Cloudy Summit, IL Weather - Sunday Partly Cloudy Summit, IL Weather - Sunday Night Partly Cloudy Summit, IL Weather - Labor Day Partly Cloudy Summit, IL Weather - Monday Night Partly Cloudy Summit, IL Weather - Tuesday Partly Cloudy Summit, IL Weather - Tuesday Night Partly Cloudy Summit, IL Weather - Wednesday Mostly Cloudy Summit, IL Weather - Wednesday Night Partly Cloudy Summit, IL Weather - Thursday Partly Cloudy Summit, IL Weather - Thursday Night Partly Cloudy
Mostly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Mostly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy
Hi: 79°FHi: 26°C
 Lo: 69°FLo: 21°C Hi: 79°FHi: 26°C
 Lo: 65°FLo: 18°C Hi: 79°FHi: 26°C
 Lo: 65°FLo: 18°C Hi: 89°FHi: 32°C
 Lo: 71°FLo: 22°C Hi: 89°FHi: 32°C
 Lo: 69°FLo: 21°C Hi: 80°FHi: 27°C
 Lo: 61°FLo: 16°C
POP = Probability of Precipitation.
Weather Outlook Updated: 406 PM CDT Sat Sep 05 2026 Summit, IL Weather - WeatherWorld.com

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Issued: 137 PM CDT Sat Sep 5 2026

Key Messages

  • Moderate to high swim risk expected through early Sunday during the final weekend of beach season.
  • Relatively cooler Sunday and Monday, although remaining seasonably warm.

Discussion

... Issued at 137 PM CDT Sat Sep 5 2026

After an unseasonably hot and humid stretch to start September, cooler conditions are beginning to filter over the area from north to south today. Moisture pooling along a cold front draped across the southern CWA combined with temps in the lower 90s south of the fron...