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.

Fair

75°F

24°C

Humidity 88%
Wind Speed SE 7 mph
Barometer 30.06 in (1017.3 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 15 Aug 2:53 am CDT
Extended Forecast for

Charleston IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Southeast wind around 6 mph.

    Low: 72 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and 1pm. Partly sunny, with a high near 87. South southeast wind around 7 mph becoming northwest in the morning. Chance of precipitation is 50%.

    High: 87 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 3am. Partly cloudy, with a low around 74. South wind 3 to 6 mph.

    Low: 74 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, with a high near 89. Heat index values as high as 100. West wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 89 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69. North northwest wind 3 to 7 mph.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 83. North wind 5 to 7 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. Light and variable wind.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Clear
    then Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. Southeast wind around 6 mph.
Saturday
A chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and 1pm. Partly sunny, with a high near 87. South southeast wind around 7 mph becoming northwest in the morning. Chance of precipitation is 50%.
Saturday Night
A 20 percent chance of showers and thunderstorms after 3am. Partly cloudy, with a low around 74. South wind 3 to 6 mph.
Sunday
Partly sunny, with a high near 89. Heat index values as high as 100. West wind 6 to 9 mph, with gusts as high as 15 mph.
Sunday Night
Partly cloudy, with a low around 69. North northwest wind 3 to 7 mph.
Monday
Mostly sunny, with a high near 83. North wind 5 to 7 mph.
Monday Night
Partly cloudy, with a low around 63. Light and variable wind.
Tuesday
Sunny, with a high near 85.
Tuesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.
Wednesday
A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 63.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Charleston IL
 39.48°N 88.19°W (Elev. 650 ft)
Last Update:
3:36 am CDT Aug 15, 2026
Forecast Valid:
3am CDT Aug 15, 2026-6pm CDT Aug 21, 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