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Denny, Illinois Weather Forecast
Denny, Illinois Weather
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Weather Forecast for Denny, Illinois : Perry County
Issued: 9:56 am CST Nov 20, 2025 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 100% chance of thunderstorms on Friday Mostly Sunny on Saturday Mostly Sunny on Sunday 20% chance of rain on Monday 20% chance of on Tuesday Mostly Sunny on Wednesday
High: 58°F Low: 53°F High: 67°F High: 59°F High: 63°F High: 60°F High: 62°F High: 53°F
Low: 47°F Low: 39°F Low: 43°F Low: 49°F Low: 41°F  
Rain Thunderstorms Thunderstorms Mostly Sunny Mostly Sunny Rain Partly Sunny Mostly Sunny
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Current Conditions at
CARBONDALE - (KMDH)
52°
Cloudy
as of 11:56 AM CST
Rel. Humidity: 100%
Dew Point: 52°F
Visibility: 7 Miles
Pressure: 30.05 in.
Flight Rule: IFR
Wind Data
5 MPH
340° North
Cloud Level(s): Solid Overcast at 500ft
Current Conditions at
SPARTA - (KSAR)
52°
Cloudy
as of 12:35 PM CST
Rel. Humidity: 100%
Dew Point: 52°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: LIFR
Wind Data
3 MPH
140° Southeast
Cloud Level(s): Solid Overcast at 400ft
Current Conditions at
CAIRO - (KCIR)
57°
Cloudy
as of 12:35 PM CST
Rel. Humidity: 93%
Dew Point: 55°F
Visibility: 7 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
9 MPH
140° Southeast
Cloud Level(s): Solid Overcast at 10000ft
50% chance of rain This Afternoon This Afternoon... A 50 percent chance of showers. Cloudy, with a high near 58. South southeast wind around 6 mph becoming calm.
90% chance of thunderstorms Tonight Tonight... Showers and thunderstorms before 2am, then showers likely between 2am and 3am, then showers and possibly a thunderstorm after 3am. Patchy fog after 7pm. Low around 53. Calm wind. Chance of precipitation is 90%.
100% chance of thunderstorms Friday Friday... Showers, with thunderstorms also possible after noon. High near 67. Light and variable wind becoming south southwest 5 to 9 mph in the morning. Chance of precipitation is 100%.
60% chance of thunderstorms Friday Night Friday Night... Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 47. North wind around 6 mph. Chance of precipitation is 60%.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 59. North wind 3 to 6 mph.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 39. Calm wind.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 63. Calm wind becoming southwest around 6 mph.
10% chance of rain Sunday Night Sunday Night... A slight chance of showers. Mostly cloudy, with a low around 43. Light and variable wind.
20% chance of rain Monday Monday... A chance of showers. Mostly cloudy, with a high near 60. Southeast wind 3 to 8 mph.
Rain on Monday Night Monday Night... Showers likely. Mostly cloudy, with a low around 49. Southeast wind around 7 mph becoming south southwest after midnight.
20% chance of Tuesday Tuesday... A chance of showers. Partly sunny, with a high near 62. South southwest wind 7 to 10 mph becoming west in the afternoon.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 41. West wind around 6 mph.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 53. Northwest wind 6 to 9 mph.
Current Radar Image


Sun Almanac for Denny, Illinois
Sunrise: 06:44 AM
Sunset: 4:42 PM
Civil Sunrise:06:16 AM
Civil Sunset: 5:10 PM
Nautical Sunrise: 05:43 AM
Nautical Sunset: 5:43 PM
Astro Sunrise: 05:12 AM
Astro Sunset: 6:14 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.