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

25°F

-4°C

Humidity 78%
Wind Speed S 9 mph
Barometer 30.31 in (1027.5 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 12 Jan 4:53 am CST
Extended Forecast for

Janesville IL

  • Today

    Today: Sunny, with a high near 46. Southwest wind 8 to 14 mph, with gusts as high as 25 mph.

    High: 46 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 32. South southwest wind 7 to 9 mph, with gusts as high as 18 mph.

    Low: 32 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 54. West southwest wind 10 to 17 mph, with gusts as high as 26 mph.

    High: 54 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36. West southwest wind around 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain showers between noon and 3pm, then a chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 30 by 5pm. Breezy, with a northwest wind 11 to 16 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 34 mph. Chance of precipitation is 30%.

    High: 40 °F⇓

    Mostly Cloudy
    then Chance
    Rain/Snow and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 16. Blustery, with a north northwest wind 16 to 21 mph, with gusts as high as 34 mph.

    Low: 16 °F

    Partly Cloudy
    and Blustery

  • Thursday

    Thursday: Mostly sunny, with a high near 28. North northwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 28 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of snow showers after noon. Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Snow Showers

Detailed Forecast

Today
Sunny, with a high near 46. Southwest wind 8 to 14 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 32. South southwest wind 7 to 9 mph, with gusts as high as 18 mph.
Tuesday
Increasing clouds, with a high near 54. West southwest wind 10 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 36. West southwest wind around 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.
Wednesday
A chance of rain showers between noon and 3pm, then a chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 30 by 5pm. Breezy, with a northwest wind 11 to 16 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 34 mph. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 16. Blustery, with a north northwest wind 16 to 21 mph, with gusts as high as 34 mph.
Thursday
Mostly sunny, with a high near 28. North northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Thursday Night
Mostly cloudy, with a low around 21.
Friday
A 30 percent chance of snow showers after noon. Mostly cloudy, with a high near 37.
Friday Night
Mostly cloudy, with a low around 18.
Saturday
Partly sunny, with a high near 25.
Saturday Night
Mostly cloudy, with a low around 8.
Sunday
Mostly sunny, with a high near 21.
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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:
3:24 am CST Jan 12, 2026
Forecast Valid:
5am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation