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.

Partly Cloudy

68°F

20°C

Humidity 74%
Wind Speed E 5 mph
Barometer 29.94 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 21 Jun 12:35 am CDT
Extended Forecast for

3 Miles SSW Piasa IL

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: Increasing clouds, with a low around 67. East wind 3 to 7 mph.

    Low: 67 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers and thunderstorms. High near 81. Southeast wind 11 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%.

    High: 81 °F

    Chance
    T-storms then
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before midnight. Low around 60. Southwest wind 9 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 60 °F

    T-storms then
    Slight Chance
    T-storms

  • 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 57. North wind 5 to 8 mph becoming calm in the evening.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Overnight
Increasing clouds, with a low around 67. East wind 3 to 7 mph.
Sunday
Showers and thunderstorms. High near 81. Southeast wind 11 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms, mainly before midnight. Low around 60. Southwest wind 9 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.
Monday
Mostly cloudy, with a high near 75. North wind 11 to 13 mph.
Monday Night
Partly cloudy, with a low around 57. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 59.
Thursday
Mostly sunny, with a high near 80.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 59.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Piasa IL
 39.08°N 90.15°W (Elev. 610 ft)
Last Update:
11:51 pm CDT Jun 20, 2026
Forecast Valid:
12am 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