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

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

71°F

22°C

Humidity 76%
Wind Speed SW 6 mph
Barometer 30.01 in (1015.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 19 Jun 11:53 pm CDT
Extended Forecast for

Janesville IL

  • Overnight

    Overnight: Clear, with a low around 64. Light southwest wind.

    Low: 64 °F

    Clear

  • Friday

    Friday: Increasing clouds, with a high near 85. Light south southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 16 mph.

    High: 85 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 72. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 91. Heat index values as high as 100. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 91 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 75. South wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 92. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.

    High: 92 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 6 to 8 mph, with gusts as high as 15 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 64. Light southwest wind.
Friday
Increasing clouds, with a high near 85. Light south southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 16 mph.
Friday Night
Mostly clear, with a low around 72. South wind around 11 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 91. Heat index values as high as 100. South southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Saturday Night
Clear, with a low around 75. South wind 8 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 92. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 75. South wind 6 to 8 mph, with gusts as high as 15 mph.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 92.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
A chance of showers and thunderstorms. Sunny, with a high near 90.
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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:
5:55 pm CDT Jun 19, 2025
Forecast Valid:
12am CDT Jun 20, 2025-6pm CDT Jun 26, 2025
 
Forecast Discussion
 
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Additional Resources

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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