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.

A Few Clouds

78°F

26°C

Humidity 45%
Wind Speed NW 10 G 18 mph
Barometer 30.02 in (1015.9 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 19 Jun 2:53 pm CDT
Extended Forecast for

Janesville IL

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 79. Northwest wind around 7 mph.

    High: 79 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 62. Light and variable wind.

    Low: 62 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 81. West wind 3 to 6 mph.

    High: 81 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 62. Light and variable wind.

    Low: 62 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A chance of showers between 7am and 1pm, then showers and thunderstorms after 1pm. High near 79. Southeast wind 6 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 79 °F

    Chance
    Showers then
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm after 1am. Low around 64. South southwest wind 11 to 14 mph becoming west northwest after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Low: 64 °F

    T-storms

  • Monday

    Monday: Partly sunny, with a high near 74. North northwest wind around 11 mph, with gusts as high as 20 mph.

    High: 74 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

Detailed Forecast

Juneteenth
Mostly sunny, with a high near 79. Northwest wind around 7 mph.
Tonight
Mostly cloudy, with a low around 62. Light and variable wind.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 81. West wind 3 to 6 mph.
Saturday Night
Increasing clouds, with a low around 62. Light and variable wind.
Sunday
A chance of showers between 7am and 1pm, then showers and thunderstorms after 1pm. High near 79. Southeast wind 6 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm after 1am. Low around 64. South southwest wind 11 to 14 mph becoming west northwest after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Monday
Partly sunny, with a high near 74. North northwest wind around 11 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Sunny, with a high near 76.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville IL
 39.37°N 88.22°W (Elev. 650 ft)
Last Update:
1:26 pm CDT Jun 19, 2026
Forecast Valid:
3pm CDT Jun 19, 2026-6pm CDT Jun 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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