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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 8, 2026 Latitude: 38.0475507 Longitude: -89.3270302 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Friday Saturday Sunday Monday Tuesday Wednesday
50% chance of rain on This Afternoon 90% chance of thunderstorms on Tonight Partly Sunny on Friday 20% chance of on Saturday Sunny on Sunday Sunny on Monday Partly Sunny on Tuesday Mostly Cloudy on Wednesday
High: 66°F Low: 51°F High: 51 °F High: 47°F High: 35°F High: 47°F High: 54°F High: 44°F
Low: 42°F Low: 26°F Low: 24°F Low: 34°F Low: 36°F  
Rain Thunderstorms Partly Sunny Partly Sunny Sunny Sunny Partly Sunny Mostly Cloudy
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Current Conditions at
CARBONDALE - (KMDH)
66°
Mostly Cloudy
as of 2:52 PM CST
Rel. Humidity: 77%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.69 in.
Flight Rule: MVFR
Wind Data
25 MPH
Gust: 33 MPH
180° South
Cloud Level(s): Broken at 1600ft
Current Conditions at
SPARTA - (KSAR)
64°
Cloudy
Rain
as of 2:55 PM CST
Rel. Humidity: 88%
Dew Point: 61°F
Visibility: 7 Miles
Pressure: 29.66 in.
Flight Rule: MVFR
Wind Data
15 MPH
Gust: 22 MPH
170° South
Cloud Level(s): Solid Overcast at 1500ft
Current Conditions at
MARION - (KMWA)
68°
Partly Cloudy
as of 2:45 PM CST
Rel. Humidity: 77%
Dew Point: 61°F
Visibility: 10 Miles
Pressure: 29.70 in.
Flight Rule: VFR
Wind Data
23 MPH
Gust: 35 MPH
170° South
Cloud Level(s): Scattered at 1900ft, Scattered at 2400ft
Current Conditions at
CAIRO - (KCIR)
70°
Cloudy
as of 2:55 PM CST
Rel. Humidity: 73%
Dew Point: 61°F
Visibility: 10 Miles
Pressure: 29.73 in.
Flight Rule: VFR
Wind Data
20 MPH
Gust: 25 MPH
180° South
Cloud Level(s): Scattered at 2300ft, Scattered at 3300ft, Solid Overcast at 6500ft
50% chance of rain This Afternoon This Afternoon... A 50 percent chance of showers. Cloudy, with a high near 66. Breezy, with a south wind 15 to 22 mph, with gusts as high as 33 mph.
90% chance of thunderstorms Tonight Tonight... Showers and thunderstorms before midnight, then a chance of showers between midnight and 1am. Low around 51. Breezy, with a south wind 13 to 23 mph becoming west southwest after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 90%.
Partly Sunny on Friday Friday... Partly sunny, with a temperature falling to around 51 by 8am. West wind 5 to 11 mph becoming north in the afternoon. Winds could gust as high as 21 mph.
20% chance of rain Friday Night Friday Night... A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 42. Calm wind becoming northwest around 5 mph after midnight.
20% chance of Saturday Saturday... A 20 percent chance of showers before noon. Partly sunny, with a high near 47. West northwest wind 6 to 14 mph, with gusts as high as 20 mph.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 26. West northwest wind 8 to 11 mph, with gusts as high as 20 mph.
Sunny on Sunday Sunday... Sunny, with a high near 35. Northwest wind 5 to 14 mph, with gusts as high as 21 mph.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 24. Calm wind becoming south southwest around 5 mph after midnight.
Sunny on Monday Monday... Sunny, with a high near 47. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 34. South southwest wind 7 to 9 mph.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 54. South southwest wind 7 to 10 mph.
10% chance of rain Tuesday Night Tuesday Night... A slight chance of showers. Mostly cloudy, with a low around 36. South southwest wind 6 to 9 mph becoming west northwest after midnight.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 44. Northwest wind 7 to 10 mph.
Current Radar Image


Sun Almanac for Denny, Illinois
Sunrise: 07:14 AM
Sunset: 4:55 PM
Civil Sunrise:06:45 AM
Civil Sunset: 5:24 PM
Nautical Sunrise: 06:12 AM
Nautical Sunset: 5:56 PM
Astro Sunrise: 05:40 AM
Astro Sunset: 6:28 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.