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

79°F

26°C

Humidity 69%
Wind Speed S 6 mph
Barometer 29.94 in (1013.4 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 27 Jul 7:53 am CDT
Extended Forecast for

Festus MO

Extreme Heat Warning July 27, 08:23am until July 27, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 27, 08:23am until July 27, 09:00pm

    NOW until 9:00pm Mon

    Extreme Heat Warning

  • Today

    High: 101 °F

    Hot

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 79. Light southwest wind.

    Low: 79 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 95. Heat index values as high as 109. Light and variable wind becoming north around 6 mph in the morning.

    High: 95 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70. North wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 89. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Sunny and hot, with a high near 101. Heat index values as high as 115. Calm wind becoming southwest around 5 mph in the afternoon.
Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 79. Light southwest wind.
Tuesday
Mostly sunny, with a high near 95. Heat index values as high as 109. Light and variable wind becoming north around 6 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 70. North wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 89. Calm wind becoming northeast around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny, with a high near 90.
Thursday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 50%.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 66.
Sunday
Sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Festus MO
 38.2°N 90.39°W (Elev. 495 ft)
Last Update:
5:26 am CDT Jul 27, 2026
Forecast Valid:
8am CDT Jul 27, 2026-6pm CDT Aug 2, 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