Koster, IL
Unincorporated community in Kankakee County, Illinois
Koster is a small unincorporated community in Kankakee County, Illinois. It is 3.3 miles NW of Sun River Terrace, the nearest town. Its ZIP code is 60954.
Koster at a glance
- State
- Illinois
- County
- Kankakee County
- ZIP code
- 60954
- Nearest town
- Sun River Terrace (3.3 mi)
- Time zone
- America/Chicago
- Coordinates
- 41.0917, -87.6850
Weather in Koster now
Loading the National Weather Service forecast…
Koster weather by the hour
Koster weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Koster.
This week in Koster
Sunrise, sunset and moon in Koster
What is the weather usually like in Koster?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 85°F average high
- Januarycoldest month · 16°F average low
- 41.7 inprecipitation per year · 1,058 mm
- 20.7 insnowfall per year · 53 cm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Koster: May–June and August–September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station KANKAKEE METRO WASTEWATER, IL US (USC00114603), adjusted for the elevation of Koster.
Koster weather month by month
Sunrise and sunset in Koster through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:11 AM | 4:48 PM | 9 h 36 min |
| February | 6:43 AM | 5:26 PM | 10 h 43 min |
| March | 7:00 AM | 6:58 PM | 11 h 58 min |
| April | 6:09 AM | 7:31 PM | 13 h 22 min |
| May | 5:30 AM | 8:03 PM | 14 h 32 min |
| June | 5:16 AM | 8:26 PM | 15 h 10 min |
| July | 5:30 AM | 8:23 PM | 14 h 53 min |
| August | 5:59 AM | 7:51 PM | 13 h 51 min |
| September | 6:30 AM | 7:01 PM | 12 h 31 min |
| October | 7:01 AM | 6:11 PM | 11 h 10 min |
| November | 6:37 AM | 4:33 PM | 9 h 56 min |
| December | 7:07 AM | 4:24 PM | 9 h 17 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Koster?
Koster has a hot-summer humid continental climate. The warmest month is July, with an average high of 85°F (29°C), and the coldest is January, with average lows of 16°F (-9°C).
It gets about 41.7 inches (1,058 mm) of precipitation a year. The wettest month is June and the driest is February. Snow is common: about 21 inches fall in an average year.
The best time to visit Koster is May–June and August–September. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
Webcams near Koster
The closest live webcam is Cedar Lake › North, 17.7 miles N of Koster.
Webcams: Windy.com. Distances in a straight line from Koster.
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Map of Koster, IL
Tap any road on the map to see it in Street View below. Map: © OpenStreetMap contributors.
Koster Street View
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Open in Google Maps ›Towns near Koster
Other communities near Koster
Questions about Koster
Where is Koster, IL?
Koster is an unincorporated community in Kankakee County, Illinois, 3.3 miles NW of Sun River Terrace.
What county is Koster in?
Koster is in Kankakee County, Illinois.
What is the ZIP code of Koster, IL?
The ZIP code for Koster is 60954.
What is the nearest town to Koster?
Sun River Terrace, 3.3 miles away.
Are there webcams near Koster?
Yes. The closest is Cedar Lake › North, 17.7 miles away.
What is the hottest month in Koster?
July, with an average high of 85°F (29°C).
What is the coldest month in Koster?
January, with an average low of 16°F (-9°C).
How much does it rain in Koster?
About 41.7 inches (1,058 mm) a year; the wettest month is June.
Does it snow in Koster?
Yes, about 21 inches of snow fall in an average year.
When is the best time to visit Koster?
May–June and August–September, when temperatures are most pleasant and rainy days are fewer.
What climate does Koster have?
Hot-summer humid continental (Köppen Dfa).
Last updated: