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

30°F

-1°C

Humidity 85%
Wind Speed N 15 mph
Barometer 30.22 in (1023.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 23 Mar 4:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly sunny, with a high near 50. North wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 50 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 31. East wind 6 to 8 mph, with gusts as high as 17 mph.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 57. South southeast wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 57 °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 11 to 14 mph, with gusts as high as 24 mph.
Tonight
Mostly cloudy, with a low around 31. East wind 6 to 8 mph, with gusts as high as 17 mph.
Tuesday
Mostly sunny, with a high near 57. 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:
4:36 am CDT Mar 23, 2026
Forecast Valid:
5am CDT Mar 23, 2026-6pm CDT Mar 29, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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