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

69°F

21°C

Humidity 33%
Wind Speed NW 17 G 32 mph
Barometer 29.99 in (1015.1 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 13 May 4:53 pm CDT
Extended Forecast for

Janesville IL

  • Tonight

    Tonight: Mostly clear, with a low around 43. North wind 9 to 14 mph becoming light north northwest after midnight. Winds could gust as high as 21 mph.

    Low: 43 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 69. Light north wind.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 4am. Partly cloudy, with a low around 49. Calm wind becoming south southeast 5 to 8 mph in the evening. Winds could gust as high as 16 mph.

    Low: 49 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly cloudy, with a high near 74. South wind 10 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 50%.

    High: 74 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 62 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 82. Southwest wind 9 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 82 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63. South southeast wind around 6 mph, with gusts as high as 15 mph.

    Low: 63 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 43. North wind 9 to 14 mph becoming light north northwest after midnight. Winds could gust as high as 21 mph.
Thursday
Sunny, with a high near 69. Light north wind.
Thursday Night
A 20 percent chance of showers after 4am. Partly cloudy, with a low around 49. Calm wind becoming south southeast 5 to 8 mph in the evening. Winds could gust as high as 16 mph.
Friday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly cloudy, with a high near 74. South wind 10 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 50%.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. South wind 8 to 10 mph, with gusts as high as 21 mph.
Saturday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 82. Southwest wind 9 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63. South southeast wind around 6 mph, with gusts as high as 15 mph.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 66.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Breezy.
Monday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 69.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 62.
Wednesday
A chance of showers. Mostly cloudy, with a high near 75.
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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:
1:51 pm CDT May 13, 2026
Forecast Valid:
5pm CDT May 13, 2026-6pm CDT May 20, 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