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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 19, 2026 Latitude: 38.0475507 Longitude: -89.3270302 View on Google Maps

MouseOver for Detail Forecast
Tonight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
Clear on Tonight Mostly Sunny on Tuesday Mostly Cloudy on Wednesday Mostly Sunny on Thursday Mostly Cloudy on Friday 20% chance of snow on Saturday 10% chance of snow on Sunday Sunny on Monday
Low: 11°F High: 36°F High: 47°F High: 38°F High: 23°F High: 14°F High: 23°F High: 33°F
Low: 29 °F Low: 25°F Low: 15°F Low: 4 °F Low: 6 °F Low: 8 °F  
Clear Mostly Sunny Mostly Cloudy Mostly Sunny Mostly Cloudy Snow Snow Sunny
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Current Conditions at
SPARTA - (KSAR)
23°
Clear
as of 4:35 PM CST
Rel. Humidity: 29%
Dew Point: -4°F
Visibility: 10 Miles
Pressure: 30.40 in.
Flight Rule: VFR
Wind Data
8 MPH
290° West
Cloud Level(s): Clear
Current Conditions at
CAIRO - (KCIR)
28°
Clear
as of 4:35 PM CST
Rel. Humidity: 30%
Dew Point: 1°F
Visibility: 10 Miles
Pressure: 30.42 in.
Flight Rule: VFR
Wind Data
5 MPH
290° West
Cloud Level(s): Clear
Clear on Tonight Tonight... Clear, with a low around 11. Light and variable wind.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 36. Light south wind increasing to 9 to 14 mph in the morning. Winds could gust as high as 23 mph.
Increasing Clouds on Tuesday Night Tuesday Night... Increasing clouds, with a temperature falling to near 29 by 10pm, then rising to around 34 during the remainder of the night. South wind 9 to 14 mph, with gusts as high as 25 mph.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, then gradually becoming sunny, with a high near 47. West wind 6 to 14 mph, with gusts as high as 25 mph.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 25. Light and variable wind becoming west southwest around 6 mph in the evening.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 38. Northwest wind 3 to 6 mph.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 15. Calm wind becoming north 5 to 8 mph after midnight.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 23. North wind 9 to 11 mph, with gusts as high as 18 mph.
20% chance of snow Friday Night Friday Night... A chance of snow showers. Mostly cloudy, with a low around 4. North wind around 11 mph, with gusts as high as 20 mph.
20% chance of snow Saturday Saturday... A chance of snow showers. Mostly cloudy, with a high near 14. North wind around 10 mph, with gusts as high as 20 mph.
20% chance of snow Saturday Night Saturday Night... A chance of snow showers. Mostly cloudy, with a low around 6. North wind 6 to 8 mph.
10% chance of snow Sunday Sunday... A slight chance of snow showers. Mostly sunny, with a high near 23. North wind 5 to 7 mph.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 8. Light and variable wind becoming southwest around 5 mph after midnight.
Sunny on Monday Monday... Sunny, with a high near 33. West southwest wind 5 to 7 mph.
Current Radar Image


Sun Almanac for Denny, Illinois
Sunrise: 07:10 AM
Sunset: 5:06 PM
Civil Sunrise:06:42 AM
Civil Sunset: 5:34 PM
Nautical Sunrise: 06:10 AM
Nautical Sunset: 6:07 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 6:38 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.