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Frankfort, Illinois Weather Forecast
Frankfort, Illinois Weather
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Weather Forecast for Frankfort, Illinois : Franklin County
Issued: 4:56 am CST Jan 18, 2026 Latitude: 37.9000495 Longitude: -88.9022902 View on Google Maps

MouseOver for Detail Forecast
Today Tonight M.L.King Day Tuesday Wednesday Thursday Friday Saturday
20% chance of snow on Today Cloudy on Tonight Mostly Sunny on M.L.King Day Sunny on Tuesday 20% chance of rain & snow on Wednesday Sunny on Thursday 20% chance of rain on Friday 20% chance of on Saturday
High: 31°F Low: 14°F High: 23°F High: 36°F High: 46°F High: 38°F High: 45°F High: 36°F
Low: 10°F Low: 27°F Low: 23°F Low: 26°F Low: 28°F  
Snow Cloudy Mostly Sunny Sunny Rain & Snow Sunny Rain Partly Sunny
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Current Conditions at
MARION - (KMWA)
12°
Clear
as of 5:15 AM CST
Rel. Humidity: 66%
Dew Point: 3°F
Visibility: 10 Miles
Pressure: 30.24 in.
Flight Rule: VFR
Wind Data
3 MPH
260° West
Cloud Level(s): Clear
Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
14°
Clear
as of 5:15 AM CST
Rel. Humidity: 66%
Dew Point: 5°F
Visibility: 10 Miles
Pressure: 30.24 in.
Flight Rule: VFR
Wind Data
5 MPH
260° West
Cloud Level(s): Clear
Current Conditions at
CARBONDALE - (KMDH)
10°
Clear
as of 4:52 AM CST
Rel. Humidity: 78%
Dew Point: 5°F
Visibility: 10 Miles
Pressure: 30.24 in.
Flight Rule: VFR
Wind Data
5 MPH
250° West
Cloud Level(s): Clear
Current Conditions at
MT VERNON - (KMVN)
12°
Clear
as of 4:56 AM CST
Rel. Humidity: 72%
Dew Point: 5°F
Visibility: 10 Miles
Pressure: 30.22 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
20% chance of snow Today Today... A chance of flurries between noon and 3pm. Increasing clouds, with a high near 31. South southwest wind 5 to 14 mph, with gusts as high as 24 mph.
Cloudy on Tonight Tonight... Partly cloudy, with a low around 14. South southwest wind 11 to 16 mph becoming northwest after midnight. Winds could gust as high as 24 mph.
Mostly Sunny on M.L.King Day M.L.King Day... Mostly sunny, with a high near 23. Wind chill values as low as -1. Northwest wind 6 to 14 mph, with gusts as high as 23 mph.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 10. Light and variable wind.
Sunny on Tuesday Tuesday... Sunny, with a high near 36. Light south southwest wind increasing to 5 to 10 mph in the morning.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 27. South southwest wind 8 to 13 mph, with gusts as high as 23 mph.
20% chance of rain & snow Wednesday Wednesday... A slight chance of rain and snow showers before noon. Mostly sunny, with a high near 46. West southwest wind 6 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 23. West northwest wind around 5 mph.
Sunny on Thursday Thursday... Sunny, with a high near 38. West northwest wind around 6 mph becoming light and variable in the afternoon.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 26. Calm wind becoming south 5 to 7 mph after midnight.
20% chance of rain Friday Friday... A chance of showers. Mostly cloudy, with a high near 45. South southwest wind 7 to 10 mph.
20% chance of rain Friday Night Friday Night... A chance of showers. Mostly cloudy, with a low around 28. South wind 7 to 9 mph becoming north after midnight.
20% chance of Saturday Saturday... A chance of showers. Partly sunny, with a high near 36. North northeast wind 9 to 11 mph, with gusts as high as 18 mph.
Current Radar Image


Sun Almanac for Frankfort, Illinois
Sunrise: 07:09 AM
Sunset: 5:03 PM
Civil Sunrise:06:40 AM
Civil Sunset: 5:32 PM
Nautical Sunrise: 06:08 AM
Nautical Sunset: 6:04 PM
Astro Sunrise: 05:37 AM
Astro Sunset: 6:36 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.