Koster, Illinois Weather
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Weather Forecast for Koster, Illinois : Kankakee County
Issued: 4:11 am CDT Jul 14, 2025 Latitude: 41.0916998 Longitude: -87.6850365 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Tuesday Wednesday Thursday Friday Saturday Sunday
Morning Fog on Today Mostly Clear on Tonight 20% chance of thunderstorms on Tuesday 40% chance of thunderstorms on Wednesday 70% chance of thunderstorms on Thursday Partly Sunny on Friday 20% chance of thunderstorms on Saturday 20% chance of thunderstorms on Sunday
High: 88°F Low: 66°F High: 89°F High: 89°F High: 86°F High: 82°F High: 86°F High: 86°F
Low: 70°F Low: 70°F Low: 66°F Low: 63°F Low: 68°F  
Morning Fog Mostly Clear Thunderstorms Thunderstorms Thunderstorms Partly Sunny Thunderstorms Thunderstorms
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Current Conditions at
KANKAKEE - (KIKK)
64°
Clear
as of 4:15 AM CDST
Rel. Humidity: 93%
Dew Point: 63°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
LANSING MUNICIPAL - (KIGQ)
59°
Clear
as of 4:15 AM CDST
Rel. Humidity: 100%
Dew Point: 59°F
Visibility: 7 Miles
Pressure: 30.05 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Current Conditions at
GARY - (KGYY)
61°
Mostly Cloudy
Mist
as of 4:15 AM CDST
Rel. Humidity: 100%
Dew Point: 61°F
Visibility: 2 1/2 Miles
Pressure: 30.04 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Scattered at 1300ft, Broken at 1900ft, Broken at 5500ft
Current Conditions at
VALPARAISO - (KVPZ)
63°
Clear
Mist
as of 3:56 AM CDST
Rel. Humidity: 93%
Dew Point: 61°F
Visibility: 6 Miles
Pressure: 30.05 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Morning Fog on Today Today... Patchy dense fog before 8am. Otherwise, sunny, with a high near 88. Calm wind becoming west southwest around 5 mph.

Mostly Clear on Tonight Tonight... Mostly clear, with a low around 66. Calm wind.

20% chance of thunderstorms Tuesday Tuesday... A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 89. Calm wind becoming south southeast around 5 mph in the morning. Winds could gust as high as 10 mph.

20% chance of rain Tuesday Night Tuesday Night... A 20 percent chance of showers after 1am. Partly cloudy, with a low around 70. South wind around 5 mph, with gusts as high as 10 mph.

40% chance of thunderstorms Wednesday Wednesday... A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.

40% chance of thunderstorms Wednesday Night Wednesday Night... A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.

70% chance of thunderstorms Thursday Thursday... Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 70%.

20% chance of thunderstorms Thursday Night Thursday Night... A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66.

Partly Sunny on Friday Friday... Partly sunny, with a high near 82.

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

20% chance of thunderstorms Saturday Saturday... A chance of showers and thunderstorms. Mostly sunny, with a high near 86.

20% chance of thunderstorms Saturday Night Saturday Night... A chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

20% chance of thunderstorms Sunday Sunday... A chance of showers and thunderstorms. Mostly sunny, with a high near 86.

Current Radar Image


Sun Almanac for Koster, Illinois
Sunrise: 05:31 AM
Sunset: 8:22 PM
Civil Sunrise:04:58 AM
Civil Sunset: 8:55 PM
Nautical Sunrise: 04:17 AM
Nautical Sunset: 9:36 PM
Astro Sunrise: 03:30 AM
Astro Sunset: 10:24 PM
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