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

Heavy to Excessive Rainfall and Flooding Threats in the Central and Eastern U.S.; Heat and Fire Weather Concerns in the West

Thunderstorms producing excessive rainfall and potential flooding concerns will continue through tonight from the Southern Plains to the East Coast. Areas of greatest concern for flooding are over central Texas and the Mid-Atlantic. Heat will continue to build across the West through Tuesday. Heat Advisories and Extreme Heat Warnings are in effect. Fire Weather concerns continue through Monday. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Overcast

72°F

22°C

Humidity 100%
Wind Speed E 3 mph
Barometer 30.04 in (1017.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 13 Jul 11:56 pm CDT
Extended Forecast for

2 Miles W Nason IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms before 1am. Patchy fog before 4am, then patchy fog after 5am. Otherwise, cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 88. Light and variable wind.

    High: 88 °F

    Chance
    T-storms and
    Patchy Fog

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 91 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light south southwest wind.

    Low: 73 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 92. Southwest wind 3 to 8 mph. Chance of precipitation is 30%.

    High: 92 °F

    Chance
    T-storms

  • Wednesday Night

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

    Low: 75 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 94. Southwest wind 5 to 8 mph.

    High: 94 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 75. South southwest wind around 6 mph becoming calm in the evening.

    Low: 75 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms before 1am. Patchy fog before 4am, then patchy fog after 5am. Otherwise, cloudy, with a low around 72. Calm wind.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 88. Light and variable wind.
Monday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 20%.
Tuesday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the afternoon.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light south southwest wind.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 92. Southwest wind 3 to 8 mph. Chance of precipitation is 30%.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. South southwest wind 3 to 6 mph.
Thursday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 94. Southwest wind 5 to 8 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 75. South southwest wind around 6 mph becoming calm in the evening.
Friday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 93. Southwest wind 3 to 6 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 73. West southwest wind around 5 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming southwest around 6 mph in the morning.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. South southeast wind around 5 mph becoming calm in the evening.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. Southwest wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W Nason IL
 38.18°N 89.01°W
Last Update:
10:47 pm CDT Jul 13, 2025
Forecast Valid:
12am CDT Jul 14, 2025-6pm CDT Jul 20, 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