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.

Fog/Mist

71°F

22°C

Humidity 96%
Wind Speed S 5 mph
Barometer 30.05 in (1016.9 mb)
Dewpoint 70°F (21°C)
Visibility 4.00 mi
Last update 9 Aug 6:53 am CDT
Extended Forecast for

Charleston IL

  • Today

    Today: A slight chance of showers and thunderstorms before 4pm, then a slight chance of showers after 5pm. Mostly sunny, with a high near 89. South wind 5 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers, with thunderstorms also possible after 4am. Increasing clouds, with a low around 73. South wind 10 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    Showers

  • Monday

    Monday: A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 90. Heat index values as high as 101. Southwest wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 90 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 75. South southwest wind 5 to 9 mph, with gusts as high as 18 mph.

    Low: 75 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90. Southwest wind around 9 mph, with gusts as high as 16 mph.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. Southwest wind 3 to 8 mph.

    Low: 73 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. West wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 87 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 60%.

    High: 82 °F

    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

Today
A slight chance of showers and thunderstorms before 4pm, then a slight chance of showers after 5pm. Mostly sunny, with a high near 89. South wind 5 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Tonight
A chance of showers, with thunderstorms also possible after 4am. Increasing clouds, with a low around 73. South wind 10 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Monday
A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 90. Heat index values as high as 101. Southwest wind 9 to 11 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 75. South southwest wind 5 to 9 mph, with gusts as high as 18 mph.
Tuesday
Mostly sunny, with a high near 90. Southwest wind around 9 mph, with gusts as high as 16 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. Southwest wind 3 to 8 mph.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. West wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Friday
A chance of showers. Partly sunny, with a high near 79.
Friday Night
A chance of showers. Mostly cloudy, with a low around 64.
Saturday
A chance of showers. Partly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Charleston IL
 39.48°N 88.19°W (Elev. 650 ft)
Last Update:
5:55 am CDT Aug 9, 2026
Forecast Valid:
7am CDT Aug 9, 2026-6pm CDT Aug 15, 2026
 
Forecast Discussion
 
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Additional Resources

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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