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Frankfort, Illinois Weather Forecast
Frankfort, Illinois Weather
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Weather Forecast for Frankfort, Illinois : Franklin County
Issued: 3:16 pm CST Jan 18, 2026 Latitude: 37.9000495 Longitude: -88.9022902 View on Google Maps

MouseOver for Detail Forecast
Tonight M.L.King Day Tuesday Wednesday Thursday Friday Saturday Sunday
Mostly Clear on Tonight Increasing Clouds on M.L.King Day Sunny on Tuesday 20% chance of rain & snow on Wednesday Sunny on Thursday Partly Sunny on Friday 20% chance of snow on Saturday 10% chance of snow on Sunday
Low: 14°F High: 23°F High: 37°F High: 46°F High: 37°F High: 41°F High: 29°F High: 22°F
Low: 12°F Low: 26°F Low: 23°F Low: 23°F Low: 20°F Low: 10°F  
Mostly Clear Increasing Clouds Sunny Rain & Snow Sunny Partly Sunny Snow Snow
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Current Conditions at
MARION - (KMWA)
27°
Feels like 15°F
Mostly Cloudy
as of 5:47 PM CST
Rel. Humidity: 49%
Dew Point: 10°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
14 MPH
210° Southwest
Cloud Level(s): Broken at 10000ft
Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
28°
Feels like 19°F
Cloudy
as of 5:55 PM CST
Rel. Humidity: 42%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 30.05 in.
Flight Rule: VFR
Wind Data
10 MPH
210° Southwest
Cloud Level(s): Solid Overcast at 9000ft
Current Conditions at
CARBONDALE - (KMDH)
27°
Feels like 17°F
Mostly Clear
as of 5:52 PM CST
Rel. Humidity: 45%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
9 MPH
220° Southwest
Cloud Level(s): Few at 9000ft
Current Conditions at
MT VERNON - (KMVN)
27°
Feels like 15°F
Cloudy
as of 5:56 PM CST
Rel. Humidity: 53%
Dew Point: 12°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 23 MPH
220° Southwest
Cloud Level(s): Solid Overcast at 8000ft
Mostly Clear on Tonight Tonight... Mostly cloudy, then gradually becoming mostly clear, with a low around 14. Southwest wind 10 to 13 mph becoming northwest after midnight. Winds could gust as high as 23 mph.
Increasing Clouds on M.L.King Day M.L.King Day... Increasing clouds, with a high near 23. Wind chill values as low as -1. Northwest wind 5 to 14 mph, with gusts as high as 23 mph.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 12. Calm wind.
Sunny on Tuesday Tuesday... Sunny, with a high near 37. Calm wind becoming south southwest 5 to 9 mph in the morning.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 26. South wind 6 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. Partly sunny, with a high near 46. Southwest wind 7 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 23. West northwest wind around 6 mph.
Sunny on Thursday Thursday... Sunny, with a high near 37. Northwest wind 3 to 8 mph.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 23. Calm wind becoming south southwest around 6 mph after midnight.
Partly Sunny on Friday Friday... Partly sunny, with a high near 41. South southwest wind 6 to 9 mph becoming north northeast in the afternoon.
20% chance of snow Friday Night Friday Night... A chance of snow showers. Mostly cloudy, with a low around 20. North northeast wind 7 to 9 mph.
20% chance of snow Saturday Saturday... A chance of snow showers. Mostly cloudy, with a high near 29. North northeast wind around 11 mph, with gusts as high as 18 mph.
20% chance of freezing rain & snow Saturday Night Saturday Night... A chance of snow showers and freezing rain. Mostly cloudy, with a low around 10. North wind 8 to 10 mph.
10% chance of snow Sunday Sunday... A slight chance of snow showers. Mostly sunny, with a high near 22. North wind around 9 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.