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Frankfort, Illinois Weather Forecast
Frankfort, Illinois Weather
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Weather Forecast for Frankfort, Illinois : Franklin County
Issued: 5:46 am CST Jan 21, 2026 Latitude: 37.9000495 Longitude: -88.9022902 View on Google Maps

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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: 46°F Low: 24°F High: 40°F High: 22°F High: 15°F High: 21°F High: 23°F High: 31°F
Low: 15°F Low: 5 °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
MARION - (KMWA)
37°
Cloudy
as of 7:45 AM CST
Rel. Humidity: 80%
Dew Point: 32°F
Visibility: 10 Miles
Pressure: 30.14 in.
Flight Rule: VFR
Wind Data
8 MPH
210° Southwest
Cloud Level(s): Broken at 4000ft, Solid Overcast at 9500ft
Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
37°
Feels like 27°F
Cloudy
Light Rain
as of 8:15 AM CST
Rel. Humidity: 80%
Dew Point: 32°F
Visibility: 10 Miles
Pressure: 30.14 in.
Flight Rule: VFR
Wind Data
17 MPH
Gust: 26 MPH
210° Southwest
Cloud Level(s): Scattered at 4700ft, Solid Overcast at 6000ft
Current Conditions at
CARBONDALE - (KMDH)
37°
Feels like 28°F
Mostly Cloudy
Light Rain
as of 7:52 AM CST
Rel. Humidity: 86%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 30.13 in.
Flight Rule: VFR
Wind Data
14 MPH
200° South
Cloud Level(s): Few at 4800ft, Broken at 6000ft
Current Conditions at
MT VERNON - (KMVN)
37°
Feels like 29°F
Clear
as of 7:56 AM CST
Rel. Humidity: 74%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: VFR
Wind Data
13 MPH
220° Southwest
Cloud Level(s): Clear
Mostly Cloudy on Today Today... Mostly cloudy, then gradually becoming sunny, with a high near 46. West southwest wind 7 to 14 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 40. Light and variable wind.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 15. Light northeast wind becoming north 6 to 11 mph after midnight. Winds could gust as high as 22 mph.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 22. 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 5. 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. Northeast wind around 10 mph, with gusts as high as 20 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. Mostly cloudy, with a high near 21. 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 23. Light and variable wind becoming northwest around 6 mph in the morning.
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 31. South southwest wind 5 to 7 mph.
Current Radar Image


Sun Almanac for Frankfort, Illinois
Sunrise: 07:07 AM
Sunset: 5:07 PM
Civil Sunrise:06:39 AM
Civil Sunset: 5:35 PM
Nautical Sunrise: 06:07 AM
Nautical Sunset: 6:07 PM
Astro Sunrise: 05:36 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.