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

23°F

-5°C

Humidity 68%
Wind Speed SE 12 mph
Barometer 30.30 in (1026.9 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 8 Feb 2:53 am CST
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 19. Southeast wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 19 °F

    Mostly Cloudy

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny, with a high near 33. Southeast wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 33 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. East southeast wind 6 to 8 mph.

    Low: 22 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 44. South wind around 6 mph.

    High: 44 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33. South southeast wind 6 to 9 mph becoming west southwest after midnight. Winds could gust as high as 16 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 51. West southwest wind around 8 mph becoming northwest in the morning. Winds could gust as high as 15 mph.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 28. North wind around 6 mph.

    Low: 28 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 19. Southeast wind 8 to 10 mph, with gusts as high as 16 mph.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 33. Southeast wind 9 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Partly cloudy, with a low around 22. East southeast wind 6 to 8 mph.
Monday
Mostly sunny, with a high near 44. South wind around 6 mph.
Monday Night
Mostly clear, with a low around 33. South southeast wind 6 to 9 mph becoming west southwest after midnight. Winds could gust as high as 16 mph.
Tuesday
Sunny, with a high near 51. West southwest wind around 8 mph becoming northwest in the morning. Winds could gust as high as 15 mph.
Tuesday Night
Mostly cloudy, with a low around 28. North wind around 6 mph.
Wednesday
Partly sunny, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
A chance of rain and snow after noon. Cloudy, with a high near 40. Chance of precipitation is 30%.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 43.
Friday Night
Partly cloudy, with a low around 26.
Saturday
A chance of rain. Partly sunny, with a high near 42.
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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:
1:22 am CST Feb 8, 2026
Forecast Valid:
3am CST Feb 8, 2026-6pm CST Feb 14, 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