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Denny, Illinois Weather Forecast
Denny, Illinois Weather
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Weather Forecast for Denny, Illinois : Perry County
Issued: 5:46 am CST Jan 21, 2026 Latitude: 38.0475507 Longitude: -89.3270302 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Thursday Friday Saturday Sunday Monday Tuesday
Mostly Cloudy on Today Mostly Clear on Tonight Mostly Sunny on Thursday Mostly Cloudy on Friday 60% chance of snow on Saturday 10% chance of snow on Sunday Sunny on Monday Mostly Sunny on Tuesday
High: 47°F Low: 24°F High: 39°F High: 19°F High: 15°F High: 20°F High: 22°F High: 32°F
Low: 13°F Low: 4 °F Low: 10°F Low: 6 °F Low: 8 °F  
Mostly Cloudy Mostly Clear Mostly Sunny Mostly Cloudy Snow Snow Sunny Mostly Sunny
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Current Conditions at
CARBONDALE - (KMDH)
37°
Feels like 27°F
Cloudy
as of 4:52 AM CST
Rel. Humidity: 55%
Dew Point: 23°F
Visibility: 10 Miles
Pressure: 30.16 in.
Flight Rule: VFR
Wind Data
18 MPH
Gust: 26 MPH
200° South
Cloud Level(s): Few at 4500ft, Broken at 5500ft, Solid Overcast at 7000ft
Current Conditions at
SPARTA - (KSAR)
32°
Feels like 23°F
Clear
as of 5:35 AM CST
Rel. Humidity: 46%
Dew Point: 14°F
Visibility: 10 Miles
Pressure: 30.12 in.
Flight Rule: VFR
Wind Data
12 MPH
190° South
Cloud Level(s): Clear
Current Conditions at
MARION - (KMWA)
36°
Feels like 27°F
Cloudy
as of 5:35 AM CST
Rel. Humidity: 74%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 30.18 in.
Flight Rule: VFR
Wind Data
12 MPH
Gust: 23 MPH
210° Southwest
Cloud Level(s): Scattered at 4400ft, Solid Overcast at 5500ft
Current Conditions at
CAIRO - (KCIR)
34°
Cloudy
as of 5:35 AM CST
Rel. Humidity: 93%
Dew Point: 32°F
Visibility: 7 Miles
Pressure: 30.23 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 4000ft, Broken at 4800ft, Solid Overcast at 5500ft
Mostly Cloudy on Today Today... Mostly cloudy, then gradually becoming sunny, with a high near 47. South southwest wind 7 to 13 mph, with gusts as high as 23 mph.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 24. West southwest wind around 6 mph becoming light and variable after midnight.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 39. North northwest wind around 5 mph becoming calm in the afternoon.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 13. Light north northeast wind becoming north 8 to 13 mph after midnight. Winds could gust as high as 22 mph.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 19. North wind around 14 mph, with gusts as high as 23 mph.
20% chance of snow Friday Night Friday Night... A 20 percent chance of snow showers after midnight. Mostly cloudy, with a low around 4. North northeast wind 10 to 13 mph, with gusts as high as 20 mph.
60% chance of snow Saturday Saturday... Snow showers likely, mainly after noon. Cloudy, with a high near 15. North northeast wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%.
Snow on Saturday Night Saturday Night... Snow showers likely, mainly before midnight. Mostly cloudy, with a low around 10. North northeast wind 6 to 9 mph.
10% chance of snow Sunday Sunday... A slight chance of snow showers before noon. Partly sunny, with a high near 20. North wind 6 to 8 mph.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 6. Northwest wind 3 to 5 mph.
Sunny on Monday Monday... Sunny, with a high near 22. Northwest wind 5 to 7 mph becoming west southwest in the afternoon.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 8. South southwest wind 3 to 5 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 32. South southwest wind 5 to 7 mph.
Current Radar Image


Sun Almanac for Denny, Illinois
Sunrise: 07:09 AM
Sunset: 5:08 PM
Civil Sunrise:06:41 AM
Civil Sunset: 5:36 PM
Nautical Sunrise: 06:09 AM
Nautical Sunset: 6:08 PM
Astro Sunrise: 05:37 AM
Astro Sunset: 6:40 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.