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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 16, 2026 Latitude: 38.0475507 Longitude: -89.3270302 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Saturday Sunday M.L.King Day Tuesday Wednesday Thursday
Mostly Cloudy on This Afternoon 20% chance of rain & snow on Tonight Partly Sunny on Saturday Mostly Sunny on Sunday Sunny on M.L.King Day Sunny on Tuesday Mostly Sunny on Wednesday 10% chance of rain on Thursday
High: 44°F Low: 23°F High: 31°F High: 24°F High: 35°F High: 49°F High: 38°F
Low: 14°F Low: 16°F Low: 10°F Low: 26°F Low: 26°F  
Mostly Cloudy Rain & Snow Partly Sunny Mostly Sunny Sunny Sunny Mostly Sunny Rain
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Current Conditions at
CARBONDALE - (KMDH)
39°
Mostly Cloudy
as of 3:52 PM CST
Rel. Humidity: 80%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.80 in.
Flight Rule: VFR
Wind Data
5 MPH
190° South
Cloud Level(s): Broken at 10000ft, Broken at 12000ft
Current Conditions at
SPARTA - (KSAR)
43°
Cloudy
as of 4:15 PM CST
Rel. Humidity: 52%
Dew Point: 27°F
Visibility: 10 Miles
Pressure: 29.80 in.
Flight Rule: VFR
Wind Data
5 MPH
250° West
Cloud Level(s): Scattered at 5500ft, Solid Overcast at 6500ft
Current Conditions at
MARION - (KMWA)
37°
Cloudy
as of 3:47 PM CST
Rel. Humidity: 86%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 29.80 in.
Flight Rule: VFR
Wind Data
6 MPH
220° Southwest
Cloud Level(s): Solid Overcast at 10000ft
Current Conditions at
CAIRO - (KCIR)
45°
Cloudy
as of 4:15 PM CST
Rel. Humidity: 61%
Dew Point: 32°F
Visibility: 10 Miles
Pressure: 29.84 in.
Flight Rule: VFR
Wind Data
6 MPH
230° Southwest
Cloud Level(s): Solid Overcast at 5000ft
Mostly Cloudy on This Afternoon This Afternoon... Mostly cloudy, with a high near 44. West wind around 9 mph.
20% chance of rain & snow Tonight Tonight... A slight chance of rain and snow showers before 10pm, then a slight chance of snow showers between 10pm and 3am. Mostly cloudy, with a low around 23. West northwest wind 6 to 9 mph. Chance of precipitation is 20%.
Partly Sunny on Saturday Saturday... Partly sunny, with a steady temperature around 27. West northwest wind 8 to 14 mph, with gusts as high as 21 mph.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 14. West northwest wind 5 to 9 mph.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 31. South southwest wind 5 to 13 mph, with gusts as high as 20 mph.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 16. South southwest wind 9 to 11 mph becoming northwest after midnight. Winds could gust as high as 21 mph.
Sunny on M.L.King Day M.L.King Day... Sunny, with a high near 24. Northwest wind 7 to 14 mph, with gusts as high as 23 mph.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 10. Northwest wind around 5 mph becoming calm.
Sunny on Tuesday Tuesday... Sunny, with a high near 35. Southwest wind 5 to 11 mph, with gusts as high as 20 mph.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 26. South southwest wind around 11 mph, with gusts as high as 20 mph.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 49. South southwest wind 9 to 13 mph, with gusts as high as 20 mph.
10% chance of rain Wednesday Night Wednesday Night... A slight chance of showers. Partly cloudy, with a low around 26. Southwest wind 6 to 8 mph becoming northwest after midnight.
10% chance of rain Thursday Thursday... A slight chance of showers. Mostly sunny, with a high near 38. Northwest wind 6 to 8 mph.
Current Radar Image


Sun Almanac for Denny, Illinois
Sunrise: 07:12 AM
Sunset: 5:03 PM
Civil Sunrise:06:43 AM
Civil Sunset: 5:31 PM
Nautical Sunrise: 06:11 AM
Nautical Sunset: 6:04 PM
Astro Sunrise: 05:39 AM
Astro Sunset: 6:35 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.