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.

Partly Cloudy and Breezy

37°F

3°C

Humidity 65%
Wind Speed N 22 G 32 mph
Barometer 30.40 in (1029.9 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 23 Mar 10:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly sunny, with a high near 50. North wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 50 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. East wind 6 to 8 mph.

    Low: 30 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. South southeast wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. Southeast wind around 6 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 69 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 54. South wind around 10 mph, with gusts as high as 18 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 82 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 1am, then rain likely. Low around 37. Chance of precipitation is 80%.

    Low: 37 °F

    Rain

  • Friday

    Friday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 50. North wind 10 to 13 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, with a low around 30. East wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 58. South southeast wind 6 to 9 mph, with gusts as high as 15 mph.
Tuesday Night
Mostly cloudy, with a low around 38. Southeast wind around 6 mph.
Wednesday
Partly sunny, with a high near 69. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly cloudy, with a low around 54. South wind around 10 mph, with gusts as high as 18 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Thursday Night
Rain and possibly a thunderstorm before 1am, then rain likely. Low around 37. Chance of precipitation is 80%.
Friday
Partly sunny, with a high near 47.
Friday Night
Mostly clear, with a low around 27.
Saturday
Sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
Partly sunny, with a high near 59.
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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:
10:36 am CDT Mar 23, 2026
Forecast Valid:
11am CDT Mar 23, 2026-6pm CDT Mar 29, 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