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

70°F

21°C

Humidity 35%
Wind Speed S 9 mph
Barometer 30.04 in (1017.4 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 19 Mar 2:53 pm CDT
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 70. South wind around 7 mph.

    High: 70 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 47. South southwest wind 6 to 8 mph, with gusts as high as 15 mph.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 77. Southwest wind 8 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 77 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 44. North northwest wind 5 to 7 mph becoming east northeast after midnight.

    Low: 44 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 75. East northeast wind 5 to 7 mph becoming southwest in the afternoon.

    High: 75 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56. South southwest wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 81. South southwest wind 13 to 18 mph becoming west in the afternoon. Winds could gust as high as 30 mph.

    High: 81 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 70. South wind around 7 mph.
Tonight
Partly cloudy, with a low around 47. South southwest wind 6 to 8 mph, with gusts as high as 15 mph.
Friday
Mostly sunny, with a high near 77. Southwest wind 8 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 44. North northwest wind 5 to 7 mph becoming east northeast after midnight.
Saturday
Sunny, with a high near 75. East northeast wind 5 to 7 mph becoming southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 56. South southwest wind 6 to 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 81. South southwest wind 13 to 18 mph becoming west in the afternoon. Winds could gust as high as 30 mph.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Mostly cloudy, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 63.
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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:
1:26 pm CDT Mar 19, 2026
Forecast Valid:
3pm CDT Mar 19, 2026-6pm CDT Mar 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation