National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

75°F

24°C

Humidity 64%
Wind Speed S 12 G 20 mph
Barometer 29.78 in (1007.9 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 17 Apr 9:53 pm CDT
Extended Forecast for

Sullivan IL

Flood Watch until April 18, 04:00am
Tornado Watch April 17, 10:04pm until April 17, 11:00pm
Click here for hazard details and duration
Flood Watch
...
  •  
    Flood Watch until April 18, 04:00am
    Tornado Watch April 17, 10:04pm until April 17, 11:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 48 °F

    Severe
    Thunderstorms
    then Showers

  • Saturday

    Saturday: Showers likely, mainly before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 56. Northwest wind 15 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 56 °F

    Showers
    Likely then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 14 mph becoming west southwest after midnight. Winds could gust as high as 21 mph.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 9am. Otherwise, sunny, with a high near 61. West wind 6 to 16 mph, with gusts as high as 28 mph.

    High: 61 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Patchy frost after 2am. Otherwise, mostly clear, with a low around 35. Northwest wind 6 to 10 mph becoming northeast after midnight. Winds could gust as high as 16 mph.

    Low: 35 °F

    Mostly Clear
    then Patchy
    Frost

  • Monday

    Monday: Patchy frost before 9am. Otherwise, sunny, with a high near 61. East northeast wind around 7 mph becoming south in the afternoon.

    High: 61 °F

    Patchy Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. South southeast wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Some of the storms could be severe. Low around 48. South wind 14 to 16 mph becoming west southwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers likely, mainly before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 56. Northwest wind 15 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 14 mph becoming west southwest after midnight. Winds could gust as high as 21 mph.
Sunday
Patchy frost before 9am. Otherwise, sunny, with a high near 61. West wind 6 to 16 mph, with gusts as high as 28 mph.
Sunday Night
Patchy frost after 2am. Otherwise, mostly clear, with a low around 35. Northwest wind 6 to 10 mph becoming northeast after midnight. Winds could gust as high as 16 mph.
Monday
Patchy frost before 9am. Otherwise, sunny, with a high near 61. East northeast wind around 7 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 47. South southeast wind 7 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Mostly sunny, with a high near 80.
Thursday Night
A chance of showers. Partly cloudy, with a low around 61.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 76.
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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:
9:57 pm CDT Apr 17, 2026
Forecast Valid:
10pm CDT Apr 17, 2026-6pm CDT Apr 24, 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