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

Severe Thunderstorms and Critical Fire Weather Wednesday

Scattered severe thunderstorms are possible across portions of the northern High Plains Wednesday afternoon and evening. Severe wind gusts are the primary hazard. Gusty winds and low relative humidity will contribute to critical fire weather conditions across parts of the northern Great Plains and Great Basin Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Overcast

67°F

19°C

Humidity 53%
Wind Speed SW 8 mph
Barometer 29.95 in (1014.1 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 13 May 2:56 am CDT
Extended Forecast for

3 Miles S Mount Vernon IL

  • Overnight

    Overnight: Mostly cloudy early, then becoming mostly clear, with a low around 59. West wind around 6 mph.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 74. Northwest wind 6 to 15 mph, with gusts as high as 21 mph.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 47. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 47 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 75. Calm wind.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 54. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 54 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. South wind 8 to 14 mph, with gusts as high as 22 mph.

    High: 81 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66. South wind around 7 mph.

    Low: 66 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 87. South southwest wind 6 to 9 mph.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. South wind 5 to 7 mph.

    Low: 67 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Mostly cloudy early, then becoming mostly clear, with a low around 59. West wind around 6 mph.
Wednesday
Sunny, with a high near 74. Northwest wind 6 to 15 mph, with gusts as high as 21 mph.
Wednesday Night
Clear, with a low around 47. North northwest wind 5 to 7 mph becoming calm in the evening.
Thursday
Sunny, with a high near 75. Calm wind.
Thursday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 54. Calm wind becoming south southeast around 6 mph after midnight.
Friday
A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. South wind 8 to 14 mph, with gusts as high as 22 mph.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66. South wind around 7 mph.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87. South southwest wind 6 to 9 mph.
Saturday Night
A slight chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. South wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 89. South wind 8 to 15 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 70. South wind 8 to 11 mph, with gusts as high as 21 mph.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Breezy, with a south wind 10 to 20 mph, with gusts as high as 25 mph.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind 10 to 13 mph, with gusts as high as 21 mph.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. South southwest wind 13 to 17 mph, with gusts as high as 23 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Mount Vernon IL
 38.29°N 88.89°W
Last Update:
1:26 am CDT May 13, 2026
Forecast Valid:
3am CDT May 13, 2026-6pm CDT May 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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