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.

Overcast

71°F

22°C

Humidity 96%
Wind Speed S 7 mph
Barometer 29.74 in (1006.5 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 21 Jun 11:53 pm CDT
Extended Forecast for

Janesville IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63. West northwest wind 8 to 10 mph, with gusts as high as 17 mph.

    Low: 63 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Mostly cloudy, with a high near 72. North wind around 14 mph, with gusts as high as 22 mph.

    High: 72 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly clear, with a low around 56. North wind 5 to 9 mph, with gusts as high as 16 mph.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. North northeast wind 3 to 5 mph.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 79. Light and variable wind becoming south around 5 mph in the morning.

    High: 79 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 65. Light south southwest wind.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63. West northwest wind 8 to 10 mph, with gusts as high as 17 mph.
Monday
Mostly cloudy, with a high near 72. North wind around 14 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 56. North wind 5 to 9 mph, with gusts as high as 16 mph.
Tuesday
Sunny, with a high near 77. North northeast wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 59. Calm wind.
Wednesday
Mostly sunny, with a high near 79. Light and variable wind becoming south around 5 mph in the morning.
Wednesday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 65. Light south southwest wind.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 62.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 83.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Sunday
Partly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville IL
 39.37°N 88.25°W (Elev. 669 ft)
Last Update:
11:26 pm CDT Jun 21, 2026
Forecast Valid:
12am CDT Jun 22, 2026-6pm CDT Jun 28, 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