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Koster, Illinois Weather Forecast
Koster, Illinois Weather
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Weather Forecast for Koster, Illinois : Kankakee County
Issued: 1:56 am CST Dec 15, 2025 Latitude: 41.0916998 Longitude: -87.6850365 View on Google Maps

MouseOver for Detail Forecast
Overnight Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Blowing Snow on Overnight Blowing Snow on Monday Mostly Sunny on Tuesday Mostly Sunny on Wednesday Rain on Thursday Partly Sunny on Friday Mostly Cloudy on Saturday Partly Sunny on Sunday
Low: -4°F High: 22°F High: 35°F High: 38°F High: 47°F High: 28°F High: 42°F High: 36°F
Low: 15°F Low: 28°F Low: 32°F Low: 12°F Low: 23°F Low: 26°F  
Blowing Snow Blowing Snow Mostly Sunny Mostly Sunny Rain Partly Sunny Mostly Cloudy Partly Sunny
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Current Conditions at
LANSING MUNICIPAL - (KIGQ)
1°
Feels like -13°F
Clear
as of 2:15 AM CST
Rel. Humidity: 59%
Dew Point: -9°F
Visibility: 10 Miles
Pressure: 30.49 in.
Flight Rule: VFR
Wind Data
9 MPH
200° South
Cloud Level(s): Clear
Current Conditions at
GARY - (KGYY)
3°
Feels like -11°F
Clear
as of 2:15 AM CST
Rel. Humidity: 71%
Dew Point: -4°F
Visibility: 10 Miles
Pressure: 30.48 in.
Flight Rule: VFR
Wind Data
9 MPH
200° South
Cloud Level(s): Clear
Current Conditions at
VALPARAISO - (KVPZ)
-0°
Feels like -15°F
Clear
as of 1:56 AM CST
Rel. Humidity: 70%
Dew Point: -8°F
Visibility: 10 Miles
Pressure: 30.49 in.
Flight Rule: VFR
Wind Data
9 MPH
210° Southwest
Cloud Level(s): Clear
Blowing Snow on Overnight Overnight... Patchy blowing snow after 4am. Partly cloudy, with a low around -4. Wind chill values as low as -19. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Blowing Snow on Monday Monday... Patchy blowing snow before 3pm. Partly sunny, with a high near 22. Wind chill values as low as -18. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 15. South southwest wind around 5 mph, with gusts as high as 10 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 35. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 28. West southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly Sunny on Wednesday Wednesday... Mostly sunny, with a high near 38.
40% chance of rain Wednesday Night Wednesday Night... A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 32.
Rain on Thursday Thursday... Rain, mainly before noon. Mostly cloudy, with a high near 47. Breezy.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 12.
Partly Sunny on Friday Friday... Partly sunny, with a high near 28.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 23.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 42.
Mostly Cloudy on Saturday Night Saturday Night... Mostly cloudy, with a low around 26.
Partly Sunny on Sunday Sunday... Partly sunny, with a high near 36.
Current Radar Image


Sun Almanac for Koster, Illinois
Sunrise: 07:09 AM
Sunset: 4:23 PM
Civil Sunrise:06:38 AM
Civil Sunset: 4:54 PM
Nautical Sunrise: 06:03 AM
Nautical Sunset: 5:29 PM
Astro Sunrise: 05:30 AM
Astro Sunset: 6:02 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.