Koster, Illinois Weather
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Weather Forecast for Koster, Illinois : Kankakee County
Issued: 1:42 pm CDT Jul 30, 2025 Latitude: 41.0916998 Longitude: -87.6850365 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Thursday Friday Saturday Sunday Monday Tuesday
80% chance of thunderstorms on This Afternoon 80% chance of thunderstorms on Tonight 60% chance of thunderstorms on Thursday Sunny on Friday Sunny on Saturday Sunny on Sunday Mostly Sunny on Monday 20% chance of thunderstorms on Tuesday
High: 84°F Low: 64°F High: 72°F High: 75°F High: 77°F High: 78°F High: 80°F High: 80°F
Low: 58°F Low: 55°F Low: 56°F Low: 59°F Low: 63°F  
Thunderstorms Thunderstorms Thunderstorms Sunny Sunny Sunny Mostly Sunny Thunderstorms
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Current Conditions at
KANKAKEE - (KIKK)
70°
Cloudy
Heavy Thunderstorm Rain
as of 1:35 PM CDST
Rel. Humidity: 100%
Dew Point: 70°F
Visibility: 2 Miles
Pressure: 30.09 in.
Flight Rule: LIFR
Wind Data
13 MPH
Gust: 17 MPH
020° North
Cloud Level(s): Broken at 400ft, Broken at 1100ft, Solid Overcast at 3800ft
Current Conditions at
LANSING MUNICIPAL - (KIGQ)
75°
Cloudy
Thunderstorm Rain
as of 1:35 PM CDST
Rel. Humidity: 88%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 30.08 in.
Flight Rule: VFR
Wind Data
5 MPH
030° Northeast
Cloud Level(s): Broken at 5000ft, Broken at 6500ft, Solid Overcast at 11000ft
Current Conditions at
VALPARAISO - (KVPZ)
82°
Cloudy
Thunderstorm In Vicinity
as of 1:22 PM CDST
Rel. Humidity: 69%
Dew Point: 72°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 4600ft, Solid Overcast at 11000ft
80% chance of thunderstorms This Afternoon This Afternoon... Showers and possibly a thunderstorm. High near 84. Northwest wind 5 to 10 mph becoming north northeast. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

80% chance of thunderstorms Tonight Tonight... Showers and possibly a thunderstorm. Low around 64. Northeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

60% chance of thunderstorms Thursday Thursday... Showers and thunderstorms likely, mainly before 7am. Partly sunny, with a high near 72. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 58. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.

Sunny on Friday Friday... Sunny, with a high near 75. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 55.

Sunny on Saturday Saturday... Sunny, with a high near 77.

Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 56.

Sunny on Sunday Sunday... Sunny, with a high near 78.

Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 59.

Mostly Sunny on Monday Monday... Mostly sunny, with a high near 80.

Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 63.

20% chance of thunderstorms Tuesday Tuesday... A chance of showers and thunderstorms. Mostly sunny, with a high near 80.

Current Radar Image


Sun Almanac for Koster, Illinois
Sunrise: 05:45 AM
Sunset: 8:09 PM
Civil Sunrise:05:14 AM
Civil Sunset: 8:40 PM
Nautical Sunrise: 04:36 AM
Nautical Sunset: 9:19 PM
Astro Sunrise: 03:53 AM
Astro Sunset: 10:02 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.