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

95°F

35°C

Humidity 44%
Wind Speed S 5 mph
Barometer 29.91 in (1011.9 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 4 Sep 5:53 pm CDT
Extended Forecast for

4 Miles S Sullivan IL

Extreme Heat Warning September 4, 06:29pm until September 5, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 4, 06:29pm until September 5, 07:00pm

    NOW until 7:00pm Sat

    Extreme Heat Warning

  • Tonight

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97. Heat index values as high as 104. Calm wind becoming north northwest 5 to 8 mph in the morning.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 69. Northeast wind around 7 mph.

    Low: 69 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 87. Northeast wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. East northeast wind 5 to 8 mph.

    Low: 63 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 87. East wind 5 to 7 mph.

    High: 87 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. East wind 3 to 6 mph.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 74. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Sunny and hot, with a high near 97. Heat index values as high as 104. Calm wind becoming north northwest 5 to 8 mph in the morning.
Saturday Night
Increasing clouds, with a low around 69. Northeast wind around 7 mph.
Sunday
Sunny, with a high near 87. Northeast wind 6 to 9 mph, with gusts as high as 15 mph.
Sunday Night
Mostly clear, with a low around 63. East northeast wind 5 to 8 mph.
Labor Day
Sunny, with a high near 87. East wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 64. East wind 3 to 6 mph.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 71.
Thursday
Mostly sunny, with a high near 90.
Thursday Night
Partly cloudy, with a low around 64.
Friday
Mostly sunny, with a high near 88.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Sullivan IL
 39.54°N 88.61°W (Elev. 600 ft)
Last Update:
5:46 pm CDT Sep 4, 2026
Forecast Valid:
6pm CDT Sep 4, 2026-6pm CDT Sep 11, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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