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.

Overcast

68°F

20°C

Humidity 90%
Wind Speed N 15 mph
Barometer 29.77 in (1007.6 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 2 Aug 7:53 am CDT
Extended Forecast for

Janesville IL

  • Today

    Today: A 20 percent chance of showers before 9am. Partly sunny, with a high near 79. North wind 14 to 16 mph, with gusts as high as 25 mph.

    High: 79 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 63. North wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 81. North northeast wind 6 to 8 mph.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62. Northeast wind 3 to 6 mph.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82. Light east northeast wind.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. Light south southwest wind.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Clear
    then Chance
    Showers

  • Thursday

    Thursday: A 50 percent chance of showers before 1pm. Partly sunny, with a high near 82.

    High: 82 °F

    Chance
    Showers

Detailed Forecast

Today
A 20 percent chance of showers before 9am. Partly sunny, with a high near 79. North wind 14 to 16 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 63. North wind 7 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 81. North northeast wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 62. Northeast wind 3 to 6 mph.
Tuesday
Sunny, with a high near 82. Light east northeast wind.
Tuesday Night
Mostly clear, with a low around 62. Calm wind.
Wednesday
Sunny, with a high near 84. Light south southwest wind.
Wednesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 66.
Thursday
A 50 percent chance of showers before 1pm. Partly sunny, with a high near 82.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 86.
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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:
7:36 am CDT Aug 2, 2026
Forecast Valid:
8am CDT Aug 2, 2026-6pm CDT Aug 8, 2026
 
Forecast Discussion
 
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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