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.

Fair

62°F

17°C

Humidity 80%
Wind Speed S 8 mph
Barometer 29.94 in (1013.4 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 17 Apr 1:53 am CDT
Extended Forecast for

Charleston IL

  • Overnight

    Overnight: Clear, with a low around 56. Light south wind.

    Low: 56 °F

    Clear

  • Friday

    Friday: Mostly sunny, with a high near 82. South wind 6 to 16 mph, with gusts as high as 28 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 50. South wind around 14 mph becoming west southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers likely, mainly between 7am and 1pm. Mostly cloudy, with a temperature falling to around 51 by 8am. Northwest wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 59 °F⇓

    Showers
    Likely

  • Saturday Night

    Saturday Night: Patchy frost after 3am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 6 to 16 mph, with gusts as high as 28 mph.

    High: 59 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 3am. Otherwise, mostly clear, with a low around 36. Northwest wind 5 to 8 mph becoming east northeast after midnight. Winds could gust as high as 16 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Monday

    Monday: Patchy frost before 8am. Otherwise, sunny, with a high near 62.

    High: 62 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 56. Light south wind.
Friday
Mostly sunny, with a high near 82. South wind 6 to 16 mph, with gusts as high as 28 mph.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 50. South wind around 14 mph becoming west southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers likely, mainly between 7am and 1pm. Mostly cloudy, with a temperature falling to around 51 by 8am. Northwest wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 13 mph, with gusts as high as 22 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 59. West northwest wind 6 to 16 mph, with gusts as high as 28 mph.
Sunday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 36. Northwest wind 5 to 8 mph becoming east northeast after midnight. Winds could gust as high as 16 mph.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 62.
Monday Night
Mostly clear, with a low around 48.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 55.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Charleston IL
 39.5°N 88.19°W (Elev. 650 ft)
Last Update:
1:26 am CDT Apr 17, 2026
Forecast Valid:
2am CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation