National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Jacksonville Municipal Airport (KIJX)

Lat: 39.77°NLon: 90.24°WElev: 614ft.

Fair

58°F

14°C

Humidity 100%
Wind Speed NE 3 mph
Barometer 30.24 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 25 Sep 12:35 am CDT
Extended Forecast for

Chapin IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of sprinkles before 1pm, then a slight chance of showers between 1pm and 4pm. Mostly cloudy, with a high near 71. Calm wind becoming east northeast around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 71 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 59. East wind 3 to 5 mph.

    Low: 59 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers after 11am. Mostly cloudy, with a high near 68. Light east southeast wind.

    High: 68 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 71. Light southeast wind.

    High: 71 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. Calm wind.
Friday
A slight chance of sprinkles before 1pm, then a slight chance of showers between 1pm and 4pm. Mostly cloudy, with a high near 71. Calm wind becoming east northeast around 5 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 59. East wind 3 to 5 mph.
Saturday
A 30 percent chance of showers after 11am. Mostly cloudy, with a high near 68. Light east southeast wind.
Saturday Night
Mostly cloudy, with a low around 59. Calm wind.
Sunday
Mostly cloudy, with a high near 71. Light southeast wind.
Sunday Night
Partly cloudy, with a low around 57. Calm wind.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 76.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 66.
Wednesday
Showers likely. Mostly cloudy, with a high near 73.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 63.
Thursday
A chance of showers. Mostly sunny, with a high near 73.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Chapin IL
 39.78°N 90.44°W (Elev. 630 ft)
Last Update:
12:36 am CDT Sep 25, 2026
Forecast Valid:
12am CDT Sep 25, 2026-6pm CDT Oct 1, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation