Posen, Illinois Weather
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Weather Forecast for Posen, Illinois : Washington County
Issued: 9:22 pm CDT Jun 5, 2025 Latitude: 38.2583836 Longitude: -89.3356392 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
20% chance of thunderstorms on Tonight 80% chance of thunderstorms on Friday 70% chance of thunderstorms on Saturday Partly Sunny on Sunday 20% chance of thunderstorms on Monday Sunny on Tuesday Mostly Sunny on Wednesday 20% chance of on Thursday
Low: 66°F High: 77°F High: 79°F High: 83°F High: 81°F High: 78°F High: 82°F High: 83°F
Low: 66°F Low: 64°F Low: 63°F Low: 58°F Low: 58°F Low: 61°F  
Thunderstorms Thunderstorms Thunderstorms Partly Sunny Thunderstorms Sunny Mostly Sunny Partly Sunny
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Current Conditions at
SPARTA - (KSAR)
70°
Cloudy
as of 10:55 PM CDST
Rel. Humidity: 94%
Dew Point: 68°F
Visibility: 10 Miles
Pressure: 30.03 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 6000ft, Solid Overcast at 7000ft
Current Conditions at
CENTRALIA MUNICIPAL ARPT - (KENL)
68°
Clear
Mist
as of 10:55 PM CDST
Rel. Humidity: 93%
Dew Point: 66°F
Visibility: 5 Miles
Pressure: 30.02 in.
Flight Rule: MVFR
Wind Data
3 MPH
210° Southwest
Cloud Level(s): Clear
Current Conditions at
MT VERNON - (KMVN)
66°
Clear
Mist
as of 10:56 PM CDST
Rel. Humidity: 100%
Dew Point: 66°F
Visibility: 2 Miles
Pressure: 30.01 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
CARBONDALE - (KMDH)
70°
Partly Cloudy
Mist
as of 11:13 PM CDST
Rel. Humidity: 94%
Dew Point: 68°F
Visibility: 3 Miles
Pressure: 30.01 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Scattered at 7000ft
20% chance of thunderstorms Tonight Tonight... A slight chance of showers and thunderstorms between 2am and 4am, then a slight chance of showers after 4am. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 20%.
80% chance of thunderstorms Friday Friday... Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1pm. Patchy fog before 9am. High near 77. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 80%.
40% chance of thunderstorms Friday Night Friday Night... A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. North wind 3 to 6 mph. Chance of precipitation is 40%.
70% chance of thunderstorms Saturday Saturday... A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 70%.
40% chance of thunderstorms Saturday Night Saturday Night... A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 64. West wind 3 to 6 mph. Chance of precipitation is 40%.
Partly Sunny on Sunday Sunday... Partly sunny, with a high near 83.
30% chance of thunderstorms Sunday Night Sunday Night... A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63.
20% chance of thunderstorms Monday Monday... A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. Chance of precipitation is 20%.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 58.
Sunny on Tuesday Tuesday... Sunny, with a high near 78.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 58.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 82.
Cloudy on Wednesday Night Wednesday Night... Partly cloudy, with a low around 61.
20% chance of Thursday Thursday... A 20 percent chance of showers. Partly sunny, with a high near 83.
Current Radar Image


Sun Almanac for Posen, Illinois
Sunrise: 05:34 AM
Sunset: 8:18 PM
Civil Sunrise:05:03 AM
Civil Sunset: 8:49 PM
Nautical Sunrise: 04:24 AM
Nautical Sunset: 9:29 PM
Astro Sunrise: 03:39 AM
Astro Sunset: 10:13 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.