National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

89°F

32°C

Humidity 59%
Wind Speed S 6 mph
Barometer 30.02 in (1015.6 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 17 Aug 4:53 pm CDT
Extended Forecast for

3 Miles S Janesville IL

Heat Advisory August 17, 04:59pm until August 17, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory August 17, 04:59pm until August 17, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • Tonight

    Low: 72 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Heat index values as high as 102. Southeast wind around 6 mph becoming calm in the afternoon.

    High: 91 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 90. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 40%.

    High: 90 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. Light north wind.

    Low: 71 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85. North northeast wind 5 to 9 mph.

    High: 85 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66. North northeast wind 6 to 8 mph.

    Low: 66 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between 8pm and 10pm. Mostly cloudy, with a low around 72. Light and variable wind. Chance of precipitation is 20%.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Heat index values as high as 102. Southeast wind around 6 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 72. Calm wind.
Tuesday
A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 90. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 40%.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. Light north wind.
Wednesday
Mostly sunny, with a high near 85. North northeast wind 5 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 66. North northeast wind 6 to 8 mph.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Sunny, with a high near 80.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Janesville IL
 39.33°N 88.26°W (Elev. 591 ft)
Last Update:
4:40 pm CDT Aug 17, 2025
Forecast Valid:
4pm CDT Aug 17, 2025-6pm CDT Aug 24, 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