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

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

84°F

29°C

Humidity 46%
Wind Speed NE 9 mph
Barometer 30.14 in (1020.7 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 28 Aug 12:56 pm CDT
Extended Forecast for

Mount Vernon IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 88. North northeast wind around 5 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, clear, with a low around 63. Calm wind.

    Low: 63 °F

    Clear then
    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 91. Light and variable wind.

    High: 91 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 95. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73. South wind 3 to 5 mph.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 98. South southwest wind 5 to 9 mph.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Clear, with a low around 75. Light south wind.

    Low: 75 °F

    Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 99 °F

    Hot

Detailed Forecast

This Afternoon
Sunny, with a high near 88. North northeast wind around 5 mph.
Tonight
Patchy fog after 4am. Otherwise, clear, with a low around 63. Calm wind.
Saturday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 91. Light and variable wind.
Saturday Night
Partly cloudy, with a low around 68. Calm wind.
Sunday
Sunny, with a high near 95. Light south wind becoming south southwest 5 to 10 mph in the morning.
Sunday Night
Mostly clear, with a low around 73. South wind 3 to 5 mph.
Monday
Sunny and hot, with a high near 98. South southwest wind 5 to 9 mph.
Monday Night
Clear, with a low around 75. Light south wind.
Tuesday
Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the morning.
Tuesday Night
Mostly clear, with a low around 76. Calm wind.
Wednesday
Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 8 mph in the morning.
Wednesday Night
Mostly clear, with a low around 76. Light south southwest wind.
Thursday
Sunny and hot, with a high near 100. Calm wind becoming west southwest 5 to 7 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon IL
 38.31°N 88.91°W
Last Update:
1:26 pm CDT Aug 28, 2026
Forecast Valid:
1pm CDT Aug 28, 2026-6pm CDT Sep 3, 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation