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Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

60°F

16°C

Humidity 65%
Wind Speed SE 8 mph
Barometer 30.09 in (1018.3 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 10 Oct 5:53 am CDT
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly cloudy, with a high near 79. Southeast wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 79 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 55. East wind 3 to 7 mph.

    Low: 55 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 82. Light and variable wind becoming northwest around 6 mph in the afternoon.

    High: 82 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 58. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 58 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 90. Southwest wind 6 to 13 mph, with gusts as high as 18 mph.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 68. South southwest wind 7 to 9 mph, with gusts as high as 16 mph.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. Southwest wind 9 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 17 mph.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely. Mostly sunny, with a high near 76. Chance of precipitation is 60%.

    High: 76 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy, with a high near 79. Southeast wind 6 to 9 mph, with gusts as high as 15 mph.
Tonight
Mostly cloudy, with a low around 55. East wind 3 to 7 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 82. Light and variable wind becoming northwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 58. Calm wind becoming south southwest around 6 mph after midnight.
Columbus Day
Sunny, with a high near 90. Southwest wind 6 to 13 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 68. South southwest wind 7 to 9 mph, with gusts as high as 16 mph.
Tuesday
Sunny, with a high near 86. Southwest wind 9 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 17 mph.
Tuesday Night
A 30 percent chance of showers after 1am. Mostly clear, with a low around 58.
Wednesday
Showers likely. Mostly sunny, with a high near 76. Chance of precipitation is 60%.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 56.
Thursday
A chance of showers. Mostly cloudy, with a high near 75.
Thursday Night
A chance of showers. Partly cloudy, with a low around 51.
Friday
Partly sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.61°N 88.61°W (Elev. 669 ft)
Last Update:
4:36 am CDT Oct 10, 2026
Forecast Valid:
6am CDT Oct 10, 2026-6pm CDT Oct 16, 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