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Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

90°F

32°C

Humidity 59%
Wind Speed SW 13 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 27 Jun 11:56 am CDT
Extended Forecast for

Nason IL

Heat Advisory June 27, 12:04pm until June 27, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 27, 12:04pm until June 27, 07:00pm

    NOW until 7:00pm Fri

    Heat Advisory

  • This Afternoon

    High: 94 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind around 6 mph becoming calm in the evening.

    Low: 73 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 92 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Light and variable wind.

    Low: 74 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 70%.

    High: 91 °F

    T-storms
    Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. West wind 3 to 6 mph. Chance of precipitation is 70%.

    High: 89 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 72. Light and variable wind.

    Low: 72 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 94. Southwest wind around 10 mph.
Tonight
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind around 6 mph becoming calm in the evening.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. Calm wind becoming south southwest around 5 mph in the afternoon.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Light and variable wind.
Sunday
Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 70%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind around 5 mph becoming calm in the evening.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. West wind 3 to 6 mph. Chance of precipitation is 70%.
Monday Night
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 72. Light and variable wind.
Tuesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. North northwest wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 68. Calm wind.
Wednesday
Mostly sunny, with a high near 89. Light northwest wind.
Wednesday Night
Mostly clear, with a low around 69. Calm wind.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 90. Calm wind becoming south around 5 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Nason IL
 38.18°N 88.98°W
Last Update:
11:47 am CDT Jun 27, 2025
Forecast Valid:
12pm CDT Jun 27, 2025-6pm CDT Jul 3, 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