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

Thunderstorms and Heavy Rainfall in the Mid-Atlantic; Fire Weather Concerns in the West

Thunderstorms are expected to bring heavy rain and potential significant flash and urban flooding to the Mid-Atlantic on Thursday, especially along the I-95 urban corridor. Dry conditions, gusty winds, and isolated dry thunderstorms will continue to bring a critical fire weather threat to the northwestern Great Basin into the interior Northwest through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

79°F

26°C

Humidity 94%
Wind Speed Calm
Barometer 29.99 in (1015.0 mb)
Dewpoint 77°F (25°C)
Visibility 8.00 mi
Heat Index83°F (28°C)
Last update 30 Jul 11:52 pm CDT
Extended Forecast for

5 Miles NNW Vergennes IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 72. Light west northwest wind.

    Low: 72 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 10am. Partly sunny, with a high near 85. Light north wind becoming north northwest 6 to 11 mph in the morning.

    High: 85 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. North northeast wind 7 to 10 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 82. North northeast wind 8 to 13 mph, with gusts as high as 18 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. North northeast wind 6 to 10 mph.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 81. Northeast wind 6 to 10 mph.

    High: 81 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 60. Northeast wind 3 to 7 mph.

    Low: 60 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 85. East northeast wind 3 to 6 mph.

    High: 85 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. East northeast wind around 6 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 72. Light west northwest wind.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 10am. Partly sunny, with a high near 85. Light north wind becoming north northwest 6 to 11 mph in the morning.
Thursday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. North northeast wind 7 to 10 mph. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 82. North northeast wind 8 to 13 mph, with gusts as high as 18 mph.
Friday Night
Partly cloudy, with a low around 61. North northeast wind 6 to 10 mph.
Saturday
Mostly sunny, with a high near 81. Northeast wind 6 to 10 mph.
Saturday Night
Partly cloudy, with a low around 60. Northeast wind 3 to 7 mph.
Sunday
Sunny, with a high near 85. East northeast wind 3 to 6 mph.
Sunday Night
Partly cloudy, with a low around 65. East northeast wind around 6 mph becoming calm in the evening.
Monday
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Calm wind becoming south southeast around 6 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. Southeast wind around 6 mph becoming calm in the evening.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. Calm wind becoming south 5 to 7 mph in the morning.
Tuesday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 68. East wind around 6 mph becoming calm in the evening.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind becoming south 5 to 7 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNW Vergennes IL
 37.97°N 89.36°W
Last Update:
11:16 pm CDT Jul 30, 2025
Forecast Valid:
12am CDT Jul 31, 2025-6pm CDT Aug 6, 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