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.

Thunderstorm in Vicinity Rain Fog/Mist

73°F

23°C

Humidity 96%
Wind Speed Calm
Barometer 30.00 in (1016.1 mb)
Dewpoint 72°F (22°C)
Visibility 6.00 mi
Last update 13 Jul 3:56 pm CDT
Extended Forecast for

Dahlgren IL

  • This Afternoon

    This Afternoon: Showers and thunderstorms likely. Partly sunny, with a steady temperature around 82. South southwest wind around 8 mph. Chance of precipitation is 70%.

    High: 82 °F

    T-storms
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 10pm. Cloudy, with a low around 71. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 71 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 87. Light and variable wind.

    High: 87 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. Calm wind. Chance of precipitation is 20%.

    Low: 71 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 90 °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 wind.

    Low: 73 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Southwest wind 3 to 7 mph.

    High: 91 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South southwest wind 3 to 6 mph.

    Low: 74 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Southwest wind 5 to 8 mph.

    High: 92 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Showers and thunderstorms likely. Partly sunny, with a steady temperature around 82. South southwest wind around 8 mph. Chance of precipitation is 70%.
Tonight
Showers and thunderstorms likely, mainly before 10pm. Cloudy, with a low around 71. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 87. 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, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. 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 90. 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 wind.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Southwest wind 3 to 7 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South southwest wind 3 to 6 mph.
Thursday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Southwest wind 5 to 8 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 74. Southwest wind 3 to 6 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 91. Southwest wind 3 to 6 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Light south southwest wind.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming southwest around 5 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.7°W
Last Update:
2:17 pm CDT Jul 13, 2025
Forecast Valid:
4pm CDT Jul 13, 2025-6pm CDT Jul 19, 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