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.

Overcast

43°F

6°C

Humidity 51%
Wind Speed E 12 mph
Barometer 30.42 in (1030.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 7 Apr 1:53 pm CDT
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 49. East wind around 10 mph, with gusts as high as 16 mph.

    High: 49 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 37. East wind around 9 mph, with gusts as high as 20 mph.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 68. South wind 10 to 18 mph, with gusts as high as 29 mph.

    High: 68 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52. South wind 13 to 15 mph, with gusts as high as 24 mph.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 74. Southwest wind 13 to 15 mph, with gusts as high as 24 mph.

    High: 74 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 54. South wind 9 to 13 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 67. Southwest wind around 11 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 50%.

    High: 67 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 68.

    High: 68 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 49. East wind around 10 mph, with gusts as high as 16 mph.
Tonight
Mostly cloudy, with a low around 37. East wind around 9 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a high near 68. South wind 10 to 18 mph, with gusts as high as 29 mph.
Wednesday Night
Partly cloudy, with a low around 52. South wind 13 to 15 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 74. Southwest wind 13 to 15 mph, with gusts as high as 24 mph.
Thursday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 54. South wind 9 to 13 mph, with gusts as high as 20 mph.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 67. Southwest wind around 11 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 50%.
Friday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 45.
Saturday
Partly sunny, with a high near 68.
Saturday Night
Mostly cloudy, with a low around 55.
Sunday
Partly sunny, with a high near 79.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 63.
Monday
Showers and thunderstorms likely. Partly sunny, with a high near 79. Breezy.
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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:
1:56 pm CDT Apr 7, 2026
Forecast Valid:
2pm CDT Apr 7, 2026-6pm CDT Apr 13, 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