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

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Thunderstorm in Vicinity

73°F

23°C

Humidity 76%
Wind Speed Calm
Barometer 29.94 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 14 Oct 3:55 am CDT
Extended Forecast for

Piasa IL

  • Overnight

    Overnight: Showers and thunderstorms likely, mainly after 5am. Cloudy, with a low around 68. West wind around 7 mph. Chance of precipitation is 60%.

    Low: 68 °F

    T-storms
    Likely

  • Wednesday

    Wednesday: Showers and thunderstorms before 4pm, then a chance of showers. High near 77. Northwest wind around 7 mph becoming east in the morning. Chance of precipitation is 80%.

    High: 77 °F

    T-storms then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 62. North wind 6 to 8 mph becoming east after midnight. Chance of precipitation is 30%.

    Low: 62 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. Patchy fog between 10am and 11am. High near 80. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 80%.

    High: 80 °F

    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 45. Northwest wind 8 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 80%.

    Low: 45 °F

    Showers

  • Friday

    Friday: Mostly sunny, with a high near 60. Breezy.

    High: 60 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 36.

    Low: 36 °F

    Clear

Detailed Forecast

Overnight
Showers and thunderstorms likely, mainly after 5am. Cloudy, with a low around 68. West wind around 7 mph. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms before 4pm, then a chance of showers. High near 77. Northwest wind around 7 mph becoming east in the morning. Chance of precipitation is 80%.
Wednesday Night
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 62. North wind 6 to 8 mph becoming east after midnight. Chance of precipitation is 30%.
Thursday
Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. Patchy fog between 10am and 11am. High near 80. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 80%.
Thursday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 45. Northwest wind 8 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 80%.
Friday
Mostly sunny, with a high near 60. Breezy.
Friday Night
Mostly clear, with a low around 36.
Saturday
Sunny, with a high near 62.
Saturday Night
Clear, with a low around 36.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Piasa IL
 39.13°N 90.12°W (Elev. 623 ft)
Last Update:
1:26 am CDT Oct 14, 2026
Forecast Valid:
4am CDT Oct 14, 2026-6pm CDT Oct 20, 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