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

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

76°F

24°C

Humidity 74%
Wind Speed S 12 mph
Barometer 29.98 in (1014.4 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 20 Jun 11:53 pm CDT
Extended Forecast for

Janesville IL

Heat Advisory June 21, 12:00pm until June 24, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Clear, with a low around 73. South wind 10 to 13 mph, with gusts as high as 20 mph.

    Low: 73 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 92. Heat index values as high as 101. South southwest wind 10 to 15 mph, with gusts as high as 31 mph.

    High: 92 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 75. South southwest wind 8 to 11 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 93. Heat index values as high as 100. South southwest wind 8 to 11 mph, with gusts as high as 22 mph.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 74. South wind 6 to 9 mph, with gusts as high as 17 mph.

    Low: 74 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 93. South southwest wind 6 to 9 mph, with gusts as high as 18 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. South southwest wind 5 to 7 mph, with gusts as high as 15 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 73. South wind 10 to 13 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 92. Heat index values as high as 101. South southwest wind 10 to 15 mph, with gusts as high as 31 mph.
Saturday Night
Clear, with a low around 75. South southwest wind 8 to 11 mph, with gusts as high as 25 mph.
Sunday
Sunny, with a high near 93. Heat index values as high as 100. South southwest wind 8 to 11 mph, with gusts as high as 22 mph.
Sunday Night
Clear, with a low around 74. South wind 6 to 9 mph, with gusts as high as 17 mph.
Monday
Sunny, with a high near 93. South southwest wind 6 to 9 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 74. South southwest wind 5 to 7 mph, with gusts as high as 15 mph.
Tuesday
Mostly sunny, with a high near 92.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Wednesday Night
Partly cloudy, with a low around 74.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville IL
 39.37°N 88.25°W (Elev. 669 ft)
Last Update:
9:41 pm CDT Jun 20, 2025
Forecast Valid:
12am CDT Jun 21, 2025-6pm CDT Jun 27, 2025
 
Forecast Discussion
 
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Additional Resources

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