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

53°F

12°C

Humidity 45%
Wind Speed S 9 G 20 mph
Barometer 30.01 in (1016.5 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 18 Mar 2:53 pm CDT
Extended Forecast for

Sullivan IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 54. West southwest wind around 10 mph, with gusts as high as 16 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 37. Light and variable wind.

    Low: 37 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy through mid morning, then gradual clearing, with a high near 67. South wind around 6 mph becoming north northeast in the afternoon.

    High: 67 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45. Northeast wind around 5 mph becoming light and variable.

    Low: 45 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 74. West southwest wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 74 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 48. West wind around 7 mph becoming north northwest after midnight.

    Low: 48 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 74. North northwest wind 6 to 8 mph becoming west southwest in the afternoon.

    High: 74 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 54. West southwest wind around 10 mph, with gusts as high as 16 mph.
Tonight
Increasing clouds, with a low around 37. Light and variable wind.
Thursday
Mostly cloudy through mid morning, then gradual clearing, with a high near 67. South wind around 6 mph becoming north northeast in the afternoon.
Thursday Night
Partly cloudy, with a low around 45. Northeast wind around 5 mph becoming light and variable.
Friday
Mostly sunny, with a high near 74. West southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Friday Night
Mostly cloudy, with a low around 48. West wind around 7 mph becoming north northwest after midnight.
Saturday
Mostly sunny, with a high near 74. North northwest wind 6 to 8 mph becoming west southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 53.
Sunday
Mostly sunny, with a high near 74.
Sunday Night
Mostly cloudy, with a low around 33.
Monday
Partly sunny, with a high near 49.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Partly sunny, with a high near 55.
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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:
1:26 pm CDT Mar 18, 2026
Forecast Valid:
3pm CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation