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.

Mostly Cloudy

65°F

18°C

Humidity 78%
Wind Speed SW 16 G 32 mph
Barometer 29.87 in (1011.1 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 7 Mar 1:53 pm CST
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers before 3pm. Cloudy, with a high near 63. Breezy, with a west wind 16 to 21 mph, with gusts as high as 32 mph.

    High: 63 °F

    Slight Chance
    Showers and
    Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 36. West northwest wind 6 to 14 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 62. Southwest wind 6 to 14 mph, with gusts as high as 22 mph.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 43. South southwest wind around 11 mph, with gusts as high as 20 mph.

    Low: 43 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 72. South southwest wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 57. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 57 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 77. South southwest wind 10 to 18 mph, with gusts as high as 31 mph.

    High: 77 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 54. Breezy. Chance of precipitation is 100%.

    Low: 54 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: Showers. High near 64. Breezy. Chance of precipitation is 100%.

    High: 64 °F

    Breezy.
    Showers then
    Showers
    Likely

Detailed Forecast

This Afternoon
A 20 percent chance of showers before 3pm. Cloudy, with a high near 63. Breezy, with a west wind 16 to 21 mph, with gusts as high as 32 mph.
Tonight
Mostly cloudy, with a low around 36. West northwest wind 6 to 14 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 62. Southwest wind 6 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Clear, with a low around 43. South southwest wind around 11 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 72. South southwest wind 10 to 16 mph, with gusts as high as 26 mph.
Monday Night
Mostly clear, with a low around 57. South southwest wind 10 to 13 mph, with gusts as high as 22 mph.
Tuesday
A 50 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 77. South southwest wind 10 to 18 mph, with gusts as high as 31 mph.
Tuesday Night
Showers and possibly a thunderstorm. Low around 54. Breezy. Chance of precipitation is 100%.
Wednesday
Showers. High near 64. Breezy. Chance of precipitation is 100%.
Wednesday Night
A 30 percent chance of rain before midnight. Partly cloudy, with a low around 29.
Thursday
Mostly sunny, with a high near 47.
Thursday Night
Mostly cloudy, with a low around 38.
Friday
Mostly cloudy, with a high near 61. Breezy.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
Last Update:
1:11 pm CST Mar 7, 2026
Forecast Valid:
2pm CST Mar 7, 2026-6pm CDT Mar 13, 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