Severe Weather and Heavy Rain from the Mid-South to the Mid-Atlantic; Building Heat in the West

Severe thunderstorms may bring damaging winds, a couple of tornadoes, and heavy rain across portions of the Mid-Atlantic into the Mid-South. Severe storms may produce hail across the northern/central High Plains. Hazardous heat will linger across the southern U.S. and build across the West through mid-week. Fire weather concerns continue for Interior Alaska and the Four Corners region. 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 79%
Wind Speed Vrbl 5 mph
Barometer 29.96 in (1014.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 22 Jun 11:56 am CDT
Extended Forecast for

Nason IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 77. North northwest wind around 9 mph.

    High: 77 °F

    Mostly Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 61. North wind 5 to 7 mph becoming calm  in the evening.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 83. Calm wind.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 85. Light south wind.

    High: 85 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am.  Mostly cloudy, with a low around 68. Light south southwest wind.

    Low: 68 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 86. Light west southwest wind.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms.  Partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm.  Partly sunny, with a high near 85. Calm wind.

    High: 85 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 77. North northwest wind around 9 mph.
Tonight
Partly cloudy, with a low around 61. North wind 5 to 7 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 83. Calm wind.
Tuesday Night
Mostly clear, with a low around 64. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. Light south wind.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 68. Light south southwest wind.
Thursday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Light west southwest wind.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. Calm wind.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85. Calm wind.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Light south wind.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Southwest wind 5 to 7 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind around 7 mph.
Sunday
Mostly sunny, with a high near 92. South southwest wind 8 to 16 mph, with gusts as high as 23 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Nason IL
 38.18°N 88.98°W
12:01 pm CDT Jun 22, 2026
12pm CDT Jun 22, 2026-6pm CDT Jun 28, 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