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

70°F

21°C

Humidity 100%
Wind Speed E 5 mph
Barometer 29.92 in (1012.8 mb)
Dewpoint 70°F (21°C)
Visibility 0.50 mi
Last update 27 Jun 5:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Isolated showers and thunderstorms, mainly between 1pm and 5pm. Areas of fog before 10am. Otherwise, cloudy, with a high near 81. East wind 3 to 5 mph. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms and
    Areas Fog

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly after 3am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 69. Light and variable wind. Chance of precipitation is 30%.

    Low: 69 °F

    Scattered
    T-storms and
    Patchy Fog

  • Sunday

    Sunday: Isolated showers and thunderstorms before 9am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 88. South wind 5 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 20%.

    High: 88 °F

    Isolated
    T-storms and
    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72. South wind 7 to 9 mph, with gusts as high as 15 mph.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 92. South wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 92 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. South wind 7 to 11 mph, with gusts as high as 17 mph.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. South southwest wind 7 to 9 mph, with gusts as high as 15 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 73.

    Low: 73 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

Detailed Forecast

Today
Isolated showers and thunderstorms, mainly between 1pm and 5pm. Areas of fog before 10am. Otherwise, cloudy, with a high near 81. East wind 3 to 5 mph. Chance of precipitation is 20%.
Tonight
Scattered showers and thunderstorms, mainly after 3am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 69. Light and variable wind. Chance of precipitation is 30%.
Sunday
Isolated showers and thunderstorms before 9am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 88. South wind 5 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 72. South wind 7 to 9 mph, with gusts as high as 15 mph.
Monday
Sunny, with a high near 92. South wind 8 to 13 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 73. South wind 7 to 11 mph, with gusts as high as 17 mph.
Tuesday
Sunny, with a high near 93. South southwest wind 7 to 9 mph, with gusts as high as 15 mph.
Tuesday Night
Clear, with a low around 73.
Wednesday
Sunny, with a high near 93.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
Sunny, with a high near 93.
Thursday Night
Mostly clear, with a low around 73.
Friday
A chance of showers and thunderstorms. Sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
7:21 am CDT Jun 27, 2026
Forecast Valid:
7am CDT Jun 27, 2026-6pm CDT Jul 3, 2026
 
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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