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.

Overcast

22°F

-6°C

Humidity 82%
Wind Speed W 14 mph
Barometer 30.41 in (1030.8 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill9°F (-13°C)
Last update 30 Nov 4:53 pm CST
Extended Forecast for

Janesville IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 17. West northwest wind 5 to 9 mph becoming calm in the evening.

    Low: 17 °F

    Mostly Cloudy

  • Monday

    Monday: A 40 percent chance of snow after 3pm. Cloudy, with a high near 31. Calm wind becoming east southeast around 6 mph.

    High: 31 °F

    Cloudy then
    Chance Snow

  • Monday Night

    Monday Night: Snow, mainly before 3am. Low around 19. Calm wind becoming northwest around 6 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 19 °F

    Snow then
    Snow Likely

  • Tuesday

    Tuesday: Partly sunny, with a high near 25. Northwest wind 3 to 6 mph.

    High: 25 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 15. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 15 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 34. South wind 7 to 10 mph, with gusts as high as 17 mph.

    High: 34 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 11. West southwest wind 6 to 11 mph becoming north northwest after midnight. Winds could gust as high as 17 mph.

    Low: 11 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 18.

    High: 18 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 4.

    Low: 4 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 17. West northwest wind 5 to 9 mph becoming calm in the evening.
Monday
A 40 percent chance of snow after 3pm. Cloudy, with a high near 31. Calm wind becoming east southeast around 6 mph.
Monday Night
Snow, mainly before 3am. Low around 19. Calm wind becoming northwest around 6 mph after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Tuesday
Partly sunny, with a high near 25. Northwest wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 15. Calm wind becoming south 5 to 7 mph after midnight.
Wednesday
Partly sunny, with a high near 34. South wind 7 to 10 mph, with gusts as high as 17 mph.
Wednesday Night
Mostly cloudy, with a low around 11. West southwest wind 6 to 11 mph becoming north northwest after midnight. Winds could gust as high as 17 mph.
Thursday
Mostly sunny, with a high near 18.
Thursday Night
Mostly cloudy, with a low around 4.
Friday
A 40 percent chance of snow. Mostly cloudy, with a high near 28.
Friday Night
A chance of snow. Mostly cloudy, with a low around 20.
Saturday
Mostly cloudy, with a high near 31.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
Mostly cloudy, with a high near 32.
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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:
3:16 pm CST Nov 30, 2025
Forecast Valid:
5pm CST Nov 30, 2025-6pm CST Dec 7, 2025
 
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