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

38°F

3°C

Humidity 86%
Wind Speed Calm
Barometer 30.16 in (1021.8 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 1 Nov 11:53 pm CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Partly cloudy, with a low around 31. Northwest wind 3 to 5 mph.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 56. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 33. Southwest wind 3 to 6 mph.

    Low: 33 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 62. Southwest wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 35. Light and variable wind.

    Low: 35 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 64. Light south southeast wind becoming south 6 to 11 mph in the morning. Winds could gust as high as 18 mph.

    High: 64 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45. South wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 31. Northwest wind 3 to 5 mph.
Sunday
Sunny, with a high near 56. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 33. Southwest wind 3 to 6 mph.
Monday
Sunny, with a high near 62. Southwest wind 6 to 9 mph, with gusts as high as 15 mph.
Monday Night
Increasing clouds, with a low around 35. Light and variable wind.
Tuesday
Mostly sunny, with a high near 64. Light south southeast wind becoming south 6 to 11 mph in the morning. Winds could gust as high as 18 mph.
Tuesday Night
Partly cloudy, with a low around 45. South wind 8 to 10 mph, with gusts as high as 16 mph.
Wednesday
Sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 48.
Friday
A chance of rain. Mostly sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 43.
Saturday
Mostly sunny, with a high near 65.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
1:36 am CDT Nov 2, 2025
Forecast Valid:
1am CDT Nov 2, 2025-6pm CST Nov 8, 2025
 
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