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.

Mostly Cloudy

26°F

-3°C

Humidity 53%
Wind Speed NW 18 G 29 mph
Barometer 30.49 in (1033.7 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 23 Feb 10:53 am CST
Extended Forecast for

Janesville IL

  • Today

    Today: Mostly sunny, with a high near 31. North northwest wind 9 to 16 mph, with gusts as high as 24 mph.

    High: 31 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 19. Northwest wind 5 to 7 mph becoming calm.

    Low: 19 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 43. Breezy, with a south wind 8 to 13 mph increasing to 21 to 26 mph in the afternoon. Winds could gust as high as 40 mph.

    High: 43 °F

    Mostly Cloudy
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Breezy, with a south southwest wind 15 to 20 mph becoming west 8 to 13 mph after midnight. Winds could gust as high as 29 mph.

    Low: 30 °F

    Mostly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 46. West northwest wind 5 to 10 mph, with gusts as high as 16 mph.

    High: 46 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 31. Light and variable wind becoming east 5 to 9 mph in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 31 °F

    Chance Rain
    then Rain
    Likely

  • Thursday

    Thursday: A 50 percent chance of rain before noon. Partly sunny, with a high near 42. East northeast wind 7 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 16 mph.

    High: 42 °F

    Chance Rain
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 31. North northwest wind 9 to 16 mph, with gusts as high as 24 mph.
Tonight
Increasing clouds, with a low around 19. Northwest wind 5 to 7 mph becoming calm.
Tuesday
Mostly cloudy, with a high near 43. Breezy, with a south wind 8 to 13 mph increasing to 21 to 26 mph in the afternoon. Winds could gust as high as 40 mph.
Tuesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Breezy, with a south southwest wind 15 to 20 mph becoming west 8 to 13 mph after midnight. Winds could gust as high as 29 mph.
Wednesday
Mostly sunny, with a high near 46. West northwest wind 5 to 10 mph, with gusts as high as 16 mph.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 31. Light and variable wind becoming east 5 to 9 mph in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
A 50 percent chance of rain before noon. Partly sunny, with a high near 42. East northeast wind 7 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 16 mph.
Thursday Night
Mostly clear, with a low around 25.
Friday
Sunny, with a high near 53.
Friday Night
Mostly clear, with a low around 35.
Saturday
Mostly sunny, with a high near 58.
Saturday Night
Mostly cloudy, with a low around 31.
Sunday
A chance of rain and snow. Partly sunny, with a high near 45.
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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:
11:12 am CST Feb 23, 2026
Forecast Valid:
11am CST Feb 23, 2026-6pm CST Mar 1, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation