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Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

54°F

12°C

Humidity 83%
Wind Speed Calm
Barometer 30.00 in (1015.3 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 8 Oct 2:53 am CDT
Extended Forecast for

Janesville IL

  • Today

    Today: Sunny, with a high near 82. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 52. Calm wind becoming east southeast around 5 mph after midnight.

    Low: 52 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 86. South wind 5 to 10 mph, with gusts as high as 17 mph.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. South southeast wind around 7 mph.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 83. South wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 83 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Showers. Low around 58. East southeast wind 7 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 58 °F

    Showers

  • Sunday

    Sunday: A 50 percent chance of showers before 1pm. Partly sunny, with a high near 74. East wind 7 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 16 mph.

    High: 74 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 82. Calm wind becoming west northwest around 6 mph in the afternoon.
Tonight
Clear, with a low around 52. Calm wind becoming east southeast around 5 mph after midnight.
Friday
Sunny, with a high near 86. South wind 5 to 10 mph, with gusts as high as 17 mph.
Friday Night
Mostly clear, with a low around 58. South southeast wind around 7 mph.
Saturday
Increasing clouds, with a high near 83. South wind 6 to 9 mph, with gusts as high as 15 mph.
Saturday Night
Showers. Low around 58. East southeast wind 7 to 11 mph, with gusts as high as 16 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 50 percent chance of showers before 1pm. Partly sunny, with a high near 74. East wind 7 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 16 mph.
Sunday Night
Partly cloudy, with a low around 56.
Columbus Day
Sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 59.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville IL
 39.37°N 88.25°W (Elev. 669 ft)
Last Update:
3:36 am CDT Oct 8, 2026
Forecast Valid:
4am CDT Oct 8, 2026-6pm CDT Oct 14, 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