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

45°F

7°C

Humidity 66%
Wind Speed SW 6 mph
Barometer 30.25 in (1024.4 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 6 Apr 12:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Clear, with a low around 39. West southwest wind 6 to 8 mph, with gusts as high as 18 mph.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 57. Northwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 33. North northeast wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 33 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 47. East northeast wind 8 to 10 mph, with gusts as high as 16 mph.

    High: 47 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. East wind 7 to 10 mph, with gusts as high as 18 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 68. Southeast wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 68 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52. South wind around 14 mph, with gusts as high as 23 mph.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 39. West southwest wind 6 to 8 mph, with gusts as high as 18 mph.
Monday
Sunny, with a high near 57. Northwest wind 10 to 15 mph, with gusts as high as 24 mph.
Monday Night
Increasing clouds, with a low around 33. North northeast wind 8 to 10 mph, with gusts as high as 16 mph.
Tuesday
Mostly cloudy, with a high near 47. East northeast wind 8 to 10 mph, with gusts as high as 16 mph.
Tuesday Night
Mostly cloudy, with a low around 35. East wind 7 to 10 mph, with gusts as high as 18 mph.
Wednesday
Partly sunny, with a high near 68. Southeast wind 10 to 16 mph, with gusts as high as 26 mph.
Wednesday Night
Partly cloudy, with a low around 52. South wind around 14 mph, with gusts as high as 23 mph.
Thursday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 70.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 54.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 40%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 51.
Saturday
A chance of showers. Partly sunny, with a high near 74.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 57.
Sunday
A chance of showers. Mostly cloudy, with a high near 79.
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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:
12:41 am CDT Apr 6, 2026
Forecast Valid:
1am CDT Apr 6, 2026-6pm CDT Apr 12, 2026
 
Forecast Discussion
 
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Additional Resources

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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