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Denny, Illinois Weather Forecast
Denny, Illinois Weather
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Weather Forecast for Denny, Illinois : Perry County
Issued: 3:16 pm CST Jan 20, 2026 Latitude: 38.0475507 Longitude: -89.3270302 View on Google Maps

MouseOver for Detail Forecast
Tonight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
Increasing Clouds on Tonight Clearing on Wednesday Mostly Sunny on Thursday Mostly Cloudy on Friday 20% chance of snow on Saturday Partly Sunny on Sunday Mostly Sunny on Monday Sunny on Tuesday
Low: 27 °F High: 47°F High: 38°F High: 20°F High: 14°F High: 22°F High: 24°F High: 32°F
Low: 24°F Low: 15°F Low: 5 °F Low: 10°F Low: 8 °F Low: 9 °F  
Increasing Clouds Clearing Mostly Sunny Mostly Cloudy Snow Partly Sunny Mostly Sunny Sunny
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Current Conditions at
CARBONDALE - (KMDH)
34°
Feels like 25°F
Clear
as of 4:52 PM CST
Rel. Humidity: 31%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.33 in.
Flight Rule: VFR
Wind Data
12 MPH
170° South
Cloud Level(s): Clear
Current Conditions at
SPARTA - (KSAR)
34°
Feels like 25°F
Clear
as of 5:15 PM CST
Rel. Humidity: 31%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.29 in.
Flight Rule: VFR
Wind Data
12 MPH
170° South
Cloud Level(s): Clear
Current Conditions at
MARION - (KMWA)
34°
Feels like 24°F
Clear
as of 4:45 PM CST
Rel. Humidity: 31%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.34 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 21 MPH
180° South
Cloud Level(s): Clear
Current Conditions at
CAIRO - (KCIR)
34°
Clear
as of 5:15 PM CST
Rel. Humidity: 40%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.36 in.
Flight Rule: VFR
Wind Data
5 MPH
150° Southeast
Cloud Level(s): Clear
Increasing Clouds on Tonight Tonight... Increasing clouds, with a temperature falling to near 27 by 8pm, then rising to around 33 during the remainder of the night. South wind 8 to 13 mph, with gusts as high as 23 mph.
Clearing on Wednesday Wednesday... Cloudy through mid morning, then gradual clearing, with a high near 47. West southwest wind 6 to 13 mph, with gusts as high as 22 mph.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 24. West southwest wind around 6 mph becoming north northwest after midnight.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 38. North wind 3 to 6 mph.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 15. Light north wind increasing to 5 to 10 mph after midnight. Winds could gust as high as 18 mph.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 20. North wind 11 to 14 mph, with gusts as high as 21 mph.
20% chance of snow Friday Night Friday Night... A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 5. North northeast wind 10 to 13 mph, with gusts as high as 20 mph.
20% chance of snow Saturday Saturday... A chance of snow. Cloudy, with a high near 14. North northeast wind 9 to 11 mph, with gusts as high as 20 mph.
20% chance of snow Saturday Night Saturday Night... A chance of snow, mainly before midnight. Mostly cloudy, with a low around 10. North northeast wind 6 to 9 mph.
Partly Sunny on Sunday Sunday... Partly sunny, with a high near 22. North wind 5 to 7 mph.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 8. North northwest wind 3 to 5 mph.
Mostly Sunny on Monday Monday... Mostly sunny, with a high near 24. Northwest wind 5 to 7 mph.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 9. Southwest wind 3 to 6 mph.
Sunny on Tuesday Tuesday... Sunny, with a high near 32. South southwest wind 6 to 8 mph.
Current Radar Image


Sun Almanac for Denny, Illinois
Sunrise: 07:10 AM
Sunset: 5:07 PM
Civil Sunrise:06:41 AM
Civil Sunset: 5:35 PM
Nautical Sunrise: 06:09 AM
Nautical Sunset: 6:08 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 6:39 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.