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

15°F

-9°C

Humidity 84%
Wind Speed N 9 mph
Barometer 30.29 in (1026.7 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill3°F (-16°C)
Last update 8 Dec 4:53 am CST
Extended Forecast for

Janesville IL

  • Today

    Today: Mostly sunny, with a high near 29. North northeast wind 5 to 8 mph becoming calm in the afternoon.

    High: 29 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 21. Light and variable wind becoming south southwest 10 to 15 mph in the evening. Winds could gust as high as 21 mph.

    Low: 21 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 44. South southwest wind 13 to 15 mph, with gusts as high as 23 mph.

    High: 44 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after midnight. Cloudy, with a low around 40. Breezy, with a south southwest wind 13 to 21 mph, with gusts as high as 30 mph.

    Low: 40 °F

    Cloudy then
    Chance Rain
    and Breezy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature falling to around 34 by 5pm. Breezy, with a west northwest wind 14 to 22 mph, with gusts as high as 32 mph.

    High: 43 °F⇓

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 23. Northwest wind 6 to 11 mph, with gusts as high as 18 mph.

    Low: 23 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of snow before noon. Mostly cloudy, with a high near 31. Southwest wind around 7 mph.

    High: 31 °F

    Chance Snow
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 27.

    High: 27 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 29. North northeast wind 5 to 8 mph becoming calm in the afternoon.
Tonight
Partly cloudy, with a low around 21. Light and variable wind becoming south southwest 10 to 15 mph in the evening. Winds could gust as high as 21 mph.
Tuesday
Partly sunny, with a high near 44. South southwest wind 13 to 15 mph, with gusts as high as 23 mph.
Tuesday Night
A 30 percent chance of rain after midnight. Cloudy, with a low around 40. Breezy, with a south southwest wind 13 to 21 mph, with gusts as high as 30 mph.
Wednesday
Mostly cloudy, with a temperature falling to around 34 by 5pm. Breezy, with a west northwest wind 14 to 22 mph, with gusts as high as 32 mph.
Wednesday Night
Mostly cloudy, with a low around 23. Northwest wind 6 to 11 mph, with gusts as high as 18 mph.
Thursday
A 30 percent chance of snow before noon. Mostly cloudy, with a high near 31. Southwest wind around 7 mph.
Thursday Night
Mostly cloudy, with a low around 18.
Friday
Partly sunny, with a high near 27.
Friday Night
Mostly cloudy, with a low around 3.
Saturday
Partly sunny, with a high near 14.
Saturday Night
Mostly cloudy, with a low around 4.
Sunday
Mostly sunny, with a high near 21.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville IL
 39.37°N 88.25°W (Elev. 669 ft)
Last Update:
4:52 am CST Dec 8, 2025
Forecast Valid:
5am CST Dec 8, 2025-6pm CST Dec 14, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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