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

Severe Weather Threats Across the Plains; Dangerous Heat and Wildfire Concerns for the West; Watching the Tropics

Severe thunderstorms are expected across the Central Plains accompanied by damaging wind gusts and large hail. In addition, heavy rainfall may lead to instances of flash flooding from the Plains and mid-Atlantic regions. The heavy rainfall threat continues across Florida and across the northern Gulf as we monitor a tropical disturbance tracking westward. Critical fire weather for the Great Basin. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

82°F

28°C

Humidity 82%
Wind Speed SE 3 mph
Barometer 29.97 in (1014.7 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 15 Jul 6:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. Light south wind.

    Low: 72 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 93. Southwest wind 3 to 8 mph. Chance of precipitation is 20%.

    High: 93 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South southwest wind 3 to 6 mph.

    Low: 75 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. West southwest wind 5 to 7 mph.

    High: 93 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. North wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85. Light north wind.

    High: 85 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 3 to 7 mph.

    High: 90 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 3 to 5 mph.

    Low: 74 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. Light south wind.
Wednesday
A slight chance of thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 93. Southwest wind 3 to 8 mph. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South southwest wind 3 to 6 mph.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. West southwest wind 5 to 7 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. North wind around 5 mph becoming calm in the evening.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85. Light north wind.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Calm wind.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 3 to 7 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 3 to 5 mph.
Sunday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 92. Southwest wind 3 to 6 mph.
Sunday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Light south wind.
Monday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 91. South wind 3 to 6 mph.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South southeast wind 3 to 6 mph.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 94. South wind 5 to 8 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
5:47 pm CDT Jul 15, 2025
Forecast Valid:
7pm CDT Jul 15, 2025-6pm CDT Jul 22, 2025
 
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