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.

Mostly Cloudy

39°F

4°C

Humidity 67%
Wind Speed N 8 mph
Barometer 30.11 in (1019.9 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 14 Mar 1:53 am CDT
Extended Forecast for

Janesville IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 33. North northeast wind around 6 mph.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 54. Southeast wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 54 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 46. East southeast wind 10 to 15 mph, with gusts as high as 28 mph.

    Low: 46 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain likely after 1pm. Mostly cloudy, with a high near 67. Windy, with a south wind 20 to 30 mph, with gusts as high as 48 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 67 °F

    Mostly Cloudy
    and Breezy
    then Rain
    Likely and
    Windy

  • Sunday Night

    Sunday Night: Rain before 1am, then a chance of snow. Patchy blowing snow after 3am. Low around 22. Breezy, with a south wind 22 to 25 mph becoming west after midnight. Winds could gust as high as 39 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Rain and
    Breezy then
    Rain/Snow and
    Patchy
    Blowing Snow

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Patchy blowing snow before 7am. Cloudy, with a high near 26. Blustery, with a west northwest wind around 26 mph, with gusts as high as 41 mph.

    High: 26 °F

    Chance Snow
    and Patchy
    Blowing Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 11. Blustery, with a west northwest wind 14 to 21 mph, with gusts as high as 32 mph.

    Low: 11 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of snow after 1am. Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Overnight
Mostly cloudy, with a low around 33. North northeast wind around 6 mph.
Saturday
Partly sunny, with a high near 54. Southeast wind 6 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 46. East southeast wind 10 to 15 mph, with gusts as high as 28 mph.
Sunday
Rain likely after 1pm. Mostly cloudy, with a high near 67. Windy, with a south wind 20 to 30 mph, with gusts as high as 48 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Rain before 1am, then a chance of snow. Patchy blowing snow after 3am. Low around 22. Breezy, with a south wind 22 to 25 mph becoming west after midnight. Winds could gust as high as 39 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Monday
A 30 percent chance of snow before 1pm. Patchy blowing snow before 7am. Cloudy, with a high near 26. Blustery, with a west northwest wind around 26 mph, with gusts as high as 41 mph.
Monday Night
Mostly cloudy, with a low around 11. Blustery, with a west northwest wind 14 to 21 mph, with gusts as high as 32 mph.
Tuesday
Mostly sunny, with a high near 29.
Tuesday Night
A 40 percent chance of snow after 1am. Mostly cloudy, with a low around 23.
Wednesday
Partly sunny, with a high near 53.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 63.
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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:
2:16 am CDT Mar 14, 2026
Forecast Valid:
2am CDT Mar 14, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation