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Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

64°F

18°C

Humidity 100%
Wind Speed Calm
Barometer 30.01 in (1016.0 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Jun 3:53 am CDT
Extended Forecast for

2 Miles ENE Herculaneum MO

Extreme Heat Watch June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • Today

    Today: Sunny, with a high near 95. Heat index values as high as 105. Calm wind becoming south 5 to 8 mph in the morning.

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 76. South wind around 7 mph.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 98. Heat index values as high as 113. South wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76. South wind 5 to 7 mph.

    Low: 76 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 98. South wind 5 to 8 mph.

    High: 98 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 96.

    High: 96 °F

    Slight Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 95. Heat index values as high as 105. Calm wind becoming south 5 to 8 mph in the morning.
Tonight
Mostly clear, with a low around 76. South wind around 7 mph.
Saturday
Sunny and hot, with a high near 98. Heat index values as high as 113. South wind 7 to 11 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 76. South wind 5 to 7 mph.
Sunday
Sunny and hot, with a high near 98. South wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny and hot, with a high near 98.
Monday Night
Partly cloudy, with a low around 76.
Tuesday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 96.
Tuesday Night
Partly cloudy, with a low around 75.
Wednesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 96.
Wednesday Night
Partly cloudy, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Herculaneum MO
 38.27°N 90.36°W (Elev. 377 ft)
Last Update:
3:36 am CDT Jun 20, 2025
Forecast Valid:
4am CDT Jun 20, 2025-6pm CDT Jun 26, 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