Frankfort, Illinois Weather
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Weather Forecast for Frankfort, Illinois : Franklin County
Issued: 2:15 pm CDT Sep 18, 2025 Latitude: 37.9000495 Longitude: -88.9022902 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Friday Saturday Sunday Monday Tuesday Wednesday
Sunny on This Afternoon Mostly Clear on Tonight 30% chance of thunderstorms on Friday 20% chance of thunderstorms on Saturday 40% chance of thunderstorms on Sunday 20% chance of thunderstorms on Monday 20% chance of thunderstorms on Tuesday 20% chance of on Wednesday
High: 96°F Low: 63°F High: 92°F High: 92°F High: 89°F High: 87°F High: 84°F High: 82°F
Low: 64°F Low: 66°F Low: 66°F Low: 65°F Low: 63°F  
Sunny Mostly Clear Thunderstorms Thunderstorms Thunderstorms Thunderstorms Thunderstorms Partly Sunny
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Current Conditions at
MARION - (KMWA)
91°
Clear
as of 1:47 PM CDST
Rel. Humidity: 26%
Dew Point: 52°F
Visibility: 10 Miles
Pressure: 30.01 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
HARRISBURG-RALEIGH - (KHSB)
93°
Clear
as of 2:15 PM CDST
Rel. Humidity: 23%
Dew Point: 50°F
Visibility: 10 Miles
Pressure: 30.01 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
CARBONDALE - (KMDH)
93°
Clear
as of 1:52 PM CDST
Rel. Humidity: 28%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 30.00 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
MT VERNON - (KMVN)
93°
Clear
as of 1:56 PM CDST
Rel. Humidity: 28%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 30.01 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Sunny on This Afternoon This Afternoon... Sunny, with a high near 96. South wind around 5 mph becoming calm.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 63. East wind around 5 mph becoming calm in the evening.
30% chance of thunderstorms Friday Friday... A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 92. Light and variable wind becoming west around 6 mph in the afternoon. Chance of precipitation is 30%.
30% chance of thunderstorms Friday Night Friday Night... A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 64. Calm wind.
20% chance of thunderstorms Saturday Saturday... A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 92. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 20%.
20% chance of thunderstorms Saturday Night Saturday Night... A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 20%.
40% chance of thunderstorms Sunday Sunday... A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. Calm wind becoming southwest 5 to 8 mph in the morning.
20% chance of thunderstorms Sunday Night Sunday Night... A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. South wind 3 to 5 mph.
20% chance of thunderstorms Monday Monday... A chance of showers and thunderstorms. Partly sunny, with a high near 87. South southwest wind 6 to 10 mph.
20% chance of thunderstorms Monday Night Monday Night... A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South southeast wind around 6 mph becoming calm in the evening.
20% chance of thunderstorms Tuesday Tuesday... A chance of showers and thunderstorms. Mostly cloudy, with a high near 84. Calm wind becoming south 5 to 8 mph in the morning.
20% chance of thunderstorms Tuesday Night Tuesday Night... A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Light south southeast wind.
20% chance of Wednesday Wednesday... A chance of showers. Partly sunny, with a high near 82. Light southeast wind becoming south 5 to 9 mph in the morning.
Current Radar Image


Sun Almanac for Frankfort, Illinois
Sunrise: 06:40 AM
Sunset: 6:59 PM
Civil Sunrise:06:14 AM
Civil Sunset: 7:25 PM
Nautical Sunrise: 05:43 AM
Nautical Sunset: 7:56 PM
Astro Sunrise: 05:12 AM
Astro Sunset: 8:27 PM
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