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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

27°C

80°F

Humidity 85%
Wind Speed S 9 km/h
Barometer 1014.5 mb (29.97 in)
Dewpoint 24°C (75°F)
Visibility 16 km
Heat Index29°C (85°F)
Last update 21 Jun 6:53 am CDT
Extended Forecast for

Festus MO

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

  • Today

    Today: Sunny and hot, with a high near 37. Heat index values as high as 45. Southwest wind 11 to 16 km/h, with gusts as high as 32 km/h.

    High: 37 °C

    Hot

  • Tonight

    Tonight: Clear, with a low around 24. South wind 10 to 14 km/h, with gusts as high as 32 km/h.

    Low: 24 °C

    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 37. Heat index values as high as 43. South wind 8 to 13 km/h.

    High: 37 °C

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 24. South wind 5 to 10 km/h.

    Low: 24 °C

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 37. Calm wind becoming south 5 to 10 km/h in the morning.

    High: 37 °C

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 24.

    Low: 24 °C

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 36.

    High: 36 °C

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24.

    Low: 24 °C

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny and hot, with a high near 36.

    High: 36 °C

    Hot

Detailed Forecast

Today
Sunny and hot, with a high near 37. Heat index values as high as 45. Southwest wind 11 to 16 km/h, with gusts as high as 32 km/h.
Tonight
Clear, with a low around 24. South wind 10 to 14 km/h, with gusts as high as 32 km/h.
Sunday
Sunny and hot, with a high near 37. Heat index values as high as 43. South wind 8 to 13 km/h.
Sunday Night
Mostly clear, with a low around 24. South wind 5 to 10 km/h.
Monday
Sunny and hot, with a high near 37. Calm wind becoming south 5 to 10 km/h in the morning.
Monday Night
Mostly clear, with a low around 24.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 36.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Sunny and hot, with a high near 36.
Wednesday Night
Mostly clear, with a low around 24.
Thursday
Sunny and hot, with a high near 36.
Thursday Night
Partly cloudy, with a low around 23.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Festus MO
 38.22°N 90.39°W (Elev. 446 m)
Last Update:
5:37 am CDT Jun 21, 2025
Forecast Valid:
7am CDT Jun 21, 2025-6pm CDT Jun 27, 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