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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

75°F

24°C

Humidity 74%
Wind Speed S 12 mph
Barometer 29.82 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 21 Jun 10:50 am CDT
Extended Forecast for

Piasa IL

Flood Watch June 21, 11:38am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 21, 11:38am until June 22, 01:00am

    NOW until 1:00am Mon

    Flood Watch

  • Today

    High: 78 °F

    Heavy Rain

  • Tonight

    Tonight: Scattered showers and thunderstorms before 11pm, then isolated showers between 11pm and midnight. Cloudy, with a low around 59. Southwest wind 9 to 13 mph becoming northwest after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Scattered
    T-storms then
    Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 75. North wind 11 to 13 mph.

    High: 75 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56. Northeast wind 3 to 8 mph.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 79. Northeast wind 3 to 5 mph.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 82.

    High: 82 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Today
Showers and thunderstorms, mainly before 4pm. Some of the storms could produce heavy rainfall. High near 78. South wind 15 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.
Tonight
Scattered showers and thunderstorms before 11pm, then isolated showers between 11pm and midnight. Cloudy, with a low around 59. Southwest wind 9 to 13 mph becoming northwest after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 50%.
Monday
Mostly cloudy, with a high near 75. North wind 11 to 13 mph.
Monday Night
Partly cloudy, with a low around 56. Northeast wind 3 to 8 mph.
Tuesday
Sunny, with a high near 79. Northeast wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 59.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 82.
Wednesday Night
Partly cloudy, with a low around 61.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 60. Chance of precipitation is 20%.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Piasa IL
 39.13°N 90.12°W (Elev. 623 ft)
Last Update:
11:11 am CDT Jun 21, 2026
Forecast Valid:
11am CDT Jun 21, 2026-6pm CDT Jun 27, 2026
 
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