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

79°F

26°C

Humidity 88%
Wind Speed S 7 mph
Barometer 29.99 in (1014.9 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 11 Aug 1:53 am CDT
Extended Forecast for

Charleston IL

Heat Advisory August 11, 12:00pm until August 11, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Mostly clear, with a low around 75. South southwest wind around 9 mph, with gusts as high as 17 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Mostly sunny, with a high near 91. Heat index values as high as 103. West southwest wind 8 to 13 mph, with gusts as high as 21 mph.

    High: 91 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 70. South wind 5 to 8 mph, with gusts as high as 15 mph.

    Low: 70 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 88. South wind 5 to 9 mph becoming north in the afternoon. Winds could gust as high as 15 mph.

    High: 88 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely after 10pm. Mostly cloudy, with a low around 71. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 71 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: A 40 percent chance of showers before 1pm. Partly sunny, with a high near 86. Northeast wind around 6 mph.

    High: 86 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 68. Northeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 68 °F

    Showers
    Likely

  • Friday

    Friday: A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 84.

    High: 84 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 75. South southwest wind around 9 mph, with gusts as high as 17 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Mostly sunny, with a high near 91. Heat index values as high as 103. West southwest wind 8 to 13 mph, with gusts as high as 21 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 70. South wind 5 to 8 mph, with gusts as high as 15 mph.
Wednesday
A 30 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 88. South wind 5 to 9 mph becoming north in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers likely after 10pm. Mostly cloudy, with a low around 71. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A 40 percent chance of showers before 1pm. Partly sunny, with a high near 86. Northeast wind around 6 mph.
Thursday Night
Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 68. Northeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A 30 percent chance of showers before 1pm. Mostly cloudy, with a high near 84.
Friday Night
Partly cloudy, with a low around 68.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Mostly sunny, with a high near 89.
Sunday Night
A chance of showers. Partly cloudy, with a low around 69.
Monday
Mostly sunny, with a high near 82.
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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:
1:26 am CDT Aug 11, 2026
Forecast Valid:
2am CDT Aug 11, 2026-6pm CDT Aug 17, 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