National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

71°F

22°C

Humidity 68%
Wind Speed W 12 mph
Barometer 29.83 in (1009.5 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 18 Jun 12:53 pm CDT
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 74. West northwest wind around 11 mph, with gusts as high as 17 mph.

    High: 74 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly clear, with a low around 55. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 55 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Sunny, with a high near 78. West northwest wind 3 to 8 mph.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 60. West northwest wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 82. Southwest wind 3 to 7 mph.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 62. West southwest wind around 5 mph becoming light and variable.

    Low: 62 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 78. East southeast wind 7 to 13 mph becoming south southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

    High: 78 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 59. Chance of precipitation is 80%.

    Low: 59 °F

    Showers

  • Monday

    Monday: Partly sunny, with a high near 75.

    High: 75 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 74. West northwest wind around 11 mph, with gusts as high as 17 mph.
Tonight
Mostly clear, with a low around 55. Northwest wind 5 to 7 mph becoming calm in the evening.
Juneteenth
Sunny, with a high near 78. West northwest wind 3 to 8 mph.
Friday Night
Partly cloudy, with a low around 60. West northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 82. Southwest wind 3 to 7 mph.
Saturday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 62. West southwest wind around 5 mph becoming light and variable.
Sunday
Showers and possibly a thunderstorm. High near 78. East southeast wind 7 to 13 mph becoming south southwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 59. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 54.
Tuesday
Sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 57.
Wednesday
Sunny, with a high near 79.
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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:
12:01 pm CDT Jun 18, 2026
Forecast Valid:
1pm CDT Jun 18, 2026-6pm CDT Jun 24, 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