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

42°F

6°C

Humidity 82%
Wind Speed Calm
Barometer 30.05 in (1017.9 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 19 Mar 1:53 am CDT
Extended Forecast for

Sullivan IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 36. Light southeast wind.

    Low: 36 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 70. South southeast wind 5 to 7 mph.

    High: 70 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47. Southeast wind 5 to 8 mph, with gusts as high as 16 mph.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 76. South southwest wind 7 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 76 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 45. West northwest wind 5 to 8 mph becoming north northeast after midnight.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 74. Northeast wind 5 to 7 mph becoming west southwest in the afternoon.

    High: 74 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 54. South southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 54 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 36. Light southeast wind.
Thursday
Sunny, with a high near 70. South southeast wind 5 to 7 mph.
Thursday Night
Partly cloudy, with a low around 47. Southeast wind 5 to 8 mph, with gusts as high as 16 mph.
Friday
Mostly sunny, with a high near 76. South southwest wind 7 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 22 mph.
Friday Night
Mostly cloudy, with a low around 45. West northwest wind 5 to 8 mph becoming north northeast after midnight.
Saturday
Sunny, with a high near 74. Northeast wind 5 to 7 mph becoming west southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 54. South southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday
Mostly sunny, with a high near 79.
Sunday Night
Partly cloudy, with a low around 35.
Monday
Sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Mostly cloudy, with a high near 55.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Mostly sunny, with a high near 64.
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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:
1:56 am CDT Mar 19, 2026
Forecast Valid:
1am CDT Mar 19, 2026-6pm CDT Mar 25, 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