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Frankfort, Illinois Weather Forecast
Frankfort, Illinois Weather
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Weather Forecast for Frankfort, Illinois : Franklin County
Issued: 8:41 am CST Dec 27, 2025 Latitude: 37.9000495 Longitude: -88.9022902 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Sunday Monday Tuesday Wednesday New Year's Day Friday
Morning Fog on Today Cloudy on Tonight 80% chance of rain on Sunday Mostly Sunny on Monday Sunny on Tuesday Mostly Sunny on Wednesday Mostly Sunny on New Year's Day Partly Sunny on Friday
High: 66°F Low: 61 °F High: 72°F High: 29°F High: 33°F High: 44°F High: 37°F High: 34°F
Low: 23°F Low: 19°F Low: 25°F Low: 26°F Low: 17°F  
Morning Fog Cloudy Rain Mostly Sunny Sunny Mostly Sunny Mostly Sunny Partly Sunny
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Current Conditions at
MARION - (KMWA)
50°
Cloudy
Mist
as of 8:45 AM CST
Rel. Humidity: 100%
Dew Point: 50°F
Visibility: 1 Miles
Pressure: 29.97 in.
Flight Rule: LIFR
Wind Data
5 MPH
080° East
Cloud Level(s): Solid Overcast at 200ft
Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
52°
Cloudy
Mist
as of 9:15 AM CST
Rel. Humidity: 93%
Dew Point: 50°F
Visibility: 1 1/2 Miles
Pressure: 30.00 in.
Flight Rule: LIFR
Wind Data
3 MPH
060° Northeast
Cloud Level(s): Solid Overcast at 300ft
Current Conditions at
CARBONDALE - (KMDH)
50°
Cloudy
Fog
as of 8:52 AM CST
Rel. Humidity: 100%
Dew Point: 50°F
Visibility: 1/2 Miles
Pressure: 29.97 in.
Flight Rule: LIFR
Wind Data
6 MPH
050° Northeast
Cloud Level(s): Solid Overcast at 200ft
Current Conditions at
MT VERNON - (KMVN)
48°
Cloudy
Mist
as of 9:31 AM CST
Rel. Humidity: 100%
Dew Point: 48°F
Visibility: 1 Miles
Pressure: 30.00 in.
Flight Rule: LIFR
Wind Data
8 MPH
070° East
Cloud Level(s): Solid Overcast at 400ft
Morning Fog on Today Today... Patchy dense fog before 10am. Otherwise, mostly cloudy, with a high near 66. Southeast wind 6 to 8 mph.
Cloudy on Tonight Tonight... Cloudy, with a temperature falling to near 61 by 8pm, then rising to around 66 during the remainder of the night. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.
80% chance of rain Sunday Sunday... Showers, mainly after 4pm. High near 72. Breezy, with a south southwest wind 11 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.
90% chance of rain Sunday Night Sunday Night... Showers, mainly before 9pm. Low around 23. Breezy, with a southwest wind 20 to 22 mph becoming west northwest in the evening. Winds could gust as high as 34 mph. Chance of precipitation is 90%.
Mostly Sunny on Monday Monday... Mostly sunny, with a high near 29. Blustery, with a west northwest wind 15 to 21 mph, with gusts as high as 33 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 19. Northwest wind 8 to 14 mph, with gusts as high as 23 mph.
Sunny on Tuesday Tuesday... Sunny, with a high near 33. Northwest wind 6 to 9 mph.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 25. Southwest wind around 6 mph.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 44. West wind 6 to 10 mph.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 26. West southwest wind around 6 mph becoming northwest after midnight.
Mostly Sunny on New Year's Day New Year's Day... Mostly sunny, with a high near 37. North northwest wind 6 to 9 mph.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 17. North northwest wind 3 to 5 mph.
Partly Sunny on Friday Friday... Partly sunny, with a high near 34. North northwest wind 3 to 6 mph.
Current Radar Image


Sun Almanac for Frankfort, Illinois
Sunrise: 07:10 AM
Sunset: 4:43 PM
Civil Sunrise:06:41 AM
Civil Sunset: 5:13 PM
Nautical Sunrise: 06:08 AM
Nautical Sunset: 5:46 PM
Astro Sunrise: 05:36 AM
Astro Sunset: 6:18 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.