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Frankfort, Illinois Weather Forecast
Frankfort, Illinois Weather
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Weather Forecast for Frankfort, Illinois : Franklin County
Issued: 12:36 am CST Jan 26, 2026 Latitude: 37.9000495 Longitude: -88.9022902 View on Google Maps

MouseOver for Detail Forecast
Overnight Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Cloudy on Overnight Sunny on Monday Sunny on Tuesday Mostly Sunny on Wednesday Mostly Cloudy on Thursday Mostly Sunny on Friday Mostly Sunny on Saturday Partly Sunny on Sunday
Low: -5°F High: 14°F High: 31°F High: 27°F High: 21°F High: 18°F High: 21°F High: 28°F
Low: 11 °F Low: -3°F Low: 4 °F Low: 3 °F Low: -3°F Low: 4 °F  
Cloudy Sunny Sunny Mostly Sunny Mostly Cloudy Mostly Sunny Mostly Sunny Partly Sunny
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Current Conditions at
MARION - (KMWA)
Clear
as of 12:35 AM CST
Rel. Humidity: 65%
Dew Point: -0°F
Visibility: 10 Miles
Pressure: 30.36 in.
Flight Rule: VFR
Wind Data
5 MPH
300° Northwest
Cloud Level(s): Clear
Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
10°
Feels like -4°F
Clear
as of 12:35 AM CST
Rel. Humidity: 66%
Dew Point: 1°F
Visibility: 10 Miles
Pressure: 30.34 in.
Flight Rule: VFR
Wind Data
12 MPH
310° Northwest
Cloud Level(s): Clear
Current Conditions at
CARBONDALE - (KMDH)
Feels like -6°F
Clear
as of 11:52 PM CST
Rel. Humidity: 71%
Dew Point: 1°F
Visibility: 10 Miles
Pressure: 30.35 in.
Flight Rule: VFR
Wind Data
12 MPH
310° Northwest
Cloud Level(s): Clear
Cloudy on Overnight Overnight... Partly cloudy, with a low around -5. Wind chill values as low as -14. Northwest wind around 8 mph.

Sunny on Monday Monday... Sunny, with a high near 14. Wind chill values as low as -20. West northwest wind 5 to 9 mph.

Mostly Clear on Monday Night Monday Night... Mostly clear, with a temperature rising to around 11 by 4am. Wind chill values as low as -9. Light south southwest wind becoming southwest 8 to 13 mph in the evening. Winds could gust as high as 23 mph.

Sunny on Tuesday Tuesday... Sunny, with a high near 31. Wind chill values as low as -1. Southwest wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.

Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around -3. Northwest wind around 5 mph becoming calm in the evening.

Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 27. Calm wind becoming west southwest around 6 mph in the afternoon.

Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 4. Light and variable wind.

Mostly Cloudy on Thursday Thursday... Mostly cloudy, with a high near 21. Calm wind becoming north around 5 mph.

Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 3. Light north wind.

Mostly Sunny on Friday Friday... Mostly sunny, with a high near 18. North wind 3 to 7 mph.

Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around -3. North wind around 5 mph becoming calm in the evening.

Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 21. Northwest wind 3 to 6 mph.

Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 4. Light and variable wind.

Partly Sunny on Sunday Sunday... Partly sunny, with a high near 28. South southwest wind 3 to 6 mph.

Sun Almanac for Frankfort, Illinois
Sunrise: 07:04 AM
Sunset: 5:12 PM
Civil Sunrise:06:36 AM
Civil Sunset: 5:40 PM
Nautical Sunrise: 06:04 AM
Nautical Sunset: 6:12 PM
Astro Sunrise: 05:33 AM
Astro Sunset: 6:43 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.