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Frankfort, Illinois Weather Forecast
Frankfort, Illinois Weather
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Weather Forecast for Frankfort, Illinois : Franklin County
Issued: 8:02 am CST Jan 20, 2026 Latitude: 37.9000495 Longitude: -88.9022902 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Wednesday Thursday Friday Saturday Sunday Monday
Partly Sunny on Today Increasing Clouds on Tonight 20% chance of rain on Wednesday Mostly Sunny on Thursday Mostly Cloudy on Friday 20% chance of snow on Saturday Mostly Sunny on Sunday Sunny on Monday
High: 35°F Low: 28 °F High: 46°F High: 40°F High: 24°F High: 18°F High: 24°F High: 27°F
Low: 25°F Low: 17°F Low: 6 °F Low: 9 °F Low: 7 °F  
Partly Sunny Increasing Clouds Rain Mostly Sunny Mostly Cloudy Snow Mostly Sunny Sunny
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Current Conditions at
MARION - (KMWA)
12°
Mostly Cloudy
as of 7:45 AM CST
Rel. Humidity: 78%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.51 in.
Flight Rule: VFR
Wind Data
7 MPH
150° Southeast
Cloud Level(s): Broken at 7500ft
Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
12°
Mostly Cloudy
as of 7:55 AM CST
Rel. Humidity: 72%
Dew Point: 5°F
Visibility: 10 Miles
Pressure: 30.53 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 6000ft, Broken at 7500ft
Current Conditions at
CARBONDALE - (KMDH)
12°
Cloudy
as of 7:52 AM CST
Rel. Humidity: 78%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.51 in.
Flight Rule: VFR
Wind Data
6 MPH
180° South
Cloud Level(s): Solid Overcast at 7000ft
Current Conditions at
MT VERNON - (KMVN)
16°
Cloudy
as of 7:56 AM CST
Rel. Humidity: 72%
Dew Point: 9°F
Visibility: 10 Miles
Pressure: 30.50 in.
Flight Rule: VFR
Wind Data
5 MPH
170° South
Cloud Level(s): Solid Overcast at 7500ft
Partly Sunny on Today Today... Partly sunny, then gradually becoming sunny, with a high near 35. Light south wind increasing to 6 to 11 mph in the morning.
Increasing Clouds on Tonight Tonight... Increasing clouds, with a temperature falling to near 28 by 8pm, then rising to around 34 during the remainder of the night. South wind 8 to 14 mph, with gusts as high as 24 mph.
20% chance of rain Wednesday Wednesday... A 20 percent chance of showers before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 46. Southwest wind 6 to 14 mph, with gusts as high as 25 mph.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 25. Southwest wind around 5 mph becoming light and variable in the evening.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 40. North northwest wind 3 to 6 mph.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 17. Calm wind becoming north around 6 mph after midnight.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 24. North wind 7 to 11 mph, with gusts as high as 18 mph.
20% chance of snow Friday Night Friday Night... A chance of snow showers, mainly after midnight. Mostly cloudy, with a low around 6. North northeast wind around 10 mph, with gusts as high as 20 mph.
20% chance of snow Saturday Saturday... A chance of snow showers. Mostly cloudy, with a high near 18. North northeast wind around 10 mph, with gusts as high as 20 mph.
20% chance of snow Saturday Night Saturday Night... A chance of snow showers, mainly before midnight. Mostly cloudy, with a low around 9. North northeast wind 6 to 8 mph.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 24. North wind 6 to 8 mph becoming west in the afternoon.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 7. West wind 3 to 5 mph.
Sunny on Monday Monday... Sunny, with a high near 27. West northwest wind 5 to 7 mph becoming southwest in the afternoon.
Current Radar Image


Sun Almanac for Frankfort, Illinois
Sunrise: 07:08 AM
Sunset: 5:06 PM
Civil Sunrise:06:39 AM
Civil Sunset: 5:34 PM
Nautical Sunrise: 06:07 AM
Nautical Sunset: 6:06 PM
Astro Sunrise: 05:36 AM
Astro Sunset: 6:37 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.