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.

Partly Cloudy

61°F

16°C

Humidity 84%
Wind Speed S 10 mph
Barometer 29.77 in (1007.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 15 Nov 4:53 am CST
Extended Forecast for

Janesville IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 75. Breezy, with a south southwest wind 11 to 20 mph becoming west northwest in the afternoon. Winds could gust as high as 30 mph.

    High: 75 °F

    Decreasing
    Clouds and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 39. North northwest wind 9 to 13 mph, with gusts as high as 24 mph.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 55. North northwest wind 7 to 10 mph, with gusts as high as 16 mph.

    High: 55 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 30. Northwest wind around 5 mph becoming calm in the evening.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 54. Calm wind becoming southeast 5 to 7 mph in the afternoon.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: Rain. Low around 41. East southeast wind 6 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before noon. Mostly cloudy, with a high near 57. East southeast wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 57 °F

    Chance Rain
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain after noon. Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny
    then Chance
    Rain

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 75. Breezy, with a south southwest wind 11 to 20 mph becoming west northwest in the afternoon. Winds could gust as high as 30 mph.
Tonight
Clear, with a low around 39. North northwest wind 9 to 13 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 55. North northwest wind 7 to 10 mph, with gusts as high as 16 mph.
Sunday Night
Mostly clear, with a low around 30. Northwest wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 54. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Monday Night
Rain. Low around 41. East southeast wind 6 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
A 30 percent chance of rain before noon. Mostly cloudy, with a high near 57. East southeast wind 8 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
A 30 percent chance of rain after noon. Partly sunny, with a high near 58.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 44.
Thursday
Rain. Mostly cloudy, with a high near 59.
Thursday Night
Rain likely. Mostly cloudy, with a low around 49.
Friday
A chance of rain. Mostly cloudy, with a high near 62.
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:
5:37 am CST Nov 15, 2025
Forecast Valid:
5am CST Nov 15, 2025-6pm CST Nov 21, 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