Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

23°F

-5°C

Humidity 85%
Wind Speed N 7 mph
Barometer 29.99 in (1016.6 mb)
Dewpoint 19°F (-7°C)
Visibility 9.00 mi
Wind Chill15°F (-9°C)
Last update 3 Jan 4:53 am CST
Extended Forecast for

Sullivan IL

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 35. Northeast wind around 5 mph becoming light and variable  in the afternoon.

    High: 35 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 19. North northwest wind around 5 mph becoming calm  in the evening.

    Low: 19 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 36. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 27. South wind 6 to 10 mph, with gusts as high as 17 mph.

    Low: 27 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 50. South southwest wind 7 to 10 mph, with gusts as high as 17 mph.

    High: 50 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 38. South wind around 7 mph.

    Low: 38 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 57. West southwest wind around 8 mph.

    High: 57 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 55.

    High: 55 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 35. Northeast wind around 5 mph becoming light and variable in the afternoon.
Tonight
Partly cloudy, with a low around 19. North northwest wind around 5 mph becoming calm in the evening.
Sunday
Increasing clouds, with a high near 36. Calm wind becoming south southeast around 6 mph in the afternoon.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 27. South wind 6 to 10 mph, with gusts as high as 17 mph.
Monday
Mostly sunny, with a high near 50. South southwest wind 7 to 10 mph, with gusts as high as 17 mph.
Monday Night
Mostly cloudy, with a low around 38. South wind around 7 mph.
Tuesday
Mostly sunny, with a high near 57. West southwest wind around 8 mph.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Mostly sunny, with a high near 55.
Wednesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 42.
Thursday
Rain likely. Mostly cloudy, with a high near 60.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 47.
Friday
A chance of rain. Partly sunny, with a high near 56.
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan IL
 39.59°N 88.61°W (Elev. 669 ft)
3:16 am CST Jan 3, 2026
5am CST Jan 3, 2026-6pm CST Jan 9, 2026
 
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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