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.

A Few Clouds

95°F

35°C

Humidity 47%
Wind Speed NW 9 mph
Barometer 29.93 in (1012.6 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index103°F (39°C)
Last update 5 Sep 12:53 pm CDT
Extended Forecast for

Sullivan IL

Extreme Heat Warning September 5, 03:15pm until September 5, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 5, 03:15pm until September 5, 07:00pm

    NOW until 7:00pm Sat

    Extreme Heat Warning

  • This Afternoon

    High: 101 °F

    Hot

  • Tonight

    Tonight: Partly cloudy, with a low around 66. Northeast wind 7 to 10 mph, with gusts as high as 16 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 86. Northeast wind 9 to 11 mph, with gusts as high as 17 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 59. East northeast wind 6 to 10 mph, with gusts as high as 15 mph.

    Low: 59 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 86. East wind 6 to 8 mph.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. East wind 5 to 7 mph.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. South wind 5 to 8 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 101. Heat index values as high as 105. North northwest wind around 9 mph.
Tonight
Partly cloudy, with a low around 66. Northeast wind 7 to 10 mph, with gusts as high as 16 mph.
Sunday
Sunny, with a high near 86. Northeast wind 9 to 11 mph, with gusts as high as 17 mph.
Sunday Night
Mostly clear, with a low around 59. East northeast wind 6 to 10 mph, with gusts as high as 15 mph.
Labor Day
Sunny, with a high near 86. East wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 61. East wind 5 to 7 mph.
Tuesday
Sunny, with a high near 94. South wind 5 to 8 mph.
Tuesday Night
Mostly clear, with a low around 71.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67.
Thursday
A chance of showers. Partly sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 59.
Friday
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:
3:01 pm CDT Sep 5, 2026
Forecast Valid:
3pm CDT Sep 5, 2026-6pm CDT Sep 11, 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