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.

Mostly Cloudy with Haze

80°F

27°C

Humidity 67%
Wind Speed NE 3 mph
Barometer 30.00 in (1015.2 mb)
Dewpoint 68°F (20°C)
Visibility 2.50 mi
Heat Index83°F (28°C)
Last update 19 Jul 10:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Areas of smoke. Mostly sunny, with a high near 85. Northeast wind 6 to 8 mph.

    High: 85 °F

    Areas Smoke

  • Tonight

    Tonight: Patchy smoke. Mostly clear, with a low around 64. Northeast wind around 6 mph becoming calm after midnight.

    Low: 64 °F

    Patchy Smoke

  • Monday

    Monday: Patchy smoke before 1pm. Mostly sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Patchy Smoke

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 72. Calm wind becoming southwest 5 to 8 mph in the evening.

    Low: 72 °F

    Mostly Clear
    then Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers before 1pm. Mostly sunny, with a high near 90. Southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 90 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. North northwest wind 7 to 11 mph, with gusts as high as 17 mph.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80. North wind 8 to 13 mph, with gusts as high as 17 mph.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Areas of smoke. Mostly sunny, with a high near 85. Northeast wind 6 to 8 mph.
Tonight
Patchy smoke. Mostly clear, with a low around 64. Northeast wind around 6 mph becoming calm after midnight.
Monday
Patchy smoke before 1pm. Mostly sunny, with a high near 87. Light and variable wind.
Monday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 72. Calm wind becoming southwest 5 to 8 mph in the evening.
Tuesday
A 30 percent chance of showers before 1pm. Mostly sunny, with a high near 90. Southwest wind 9 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 66. North northwest wind 7 to 11 mph, with gusts as high as 17 mph.
Wednesday
Sunny, with a high near 80. North wind 8 to 13 mph, with gusts as high as 17 mph.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Sunny, with a high near 80.
Thursday Night
Partly cloudy, with a low around 60.
Friday
Mostly sunny, with a high near 81.
Friday Night
Partly cloudy, with a low around 63.
Saturday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
10:36 am CDT Jul 19, 2026
Forecast Valid:
11am CDT Jul 19, 2026-6pm CDT Jul 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation