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

Hazardous Weather Conditions

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

92°F

33°C

Humidity 43%
Wind Speed NW 10 mph
Barometer 29.82 in (1008.7 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 21 Jul 3:54 pm CDT
Extended Forecast for

Saint Peters MO

Heat Advisory July 21, 04:03pm until July 21, 07:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory July 21, 04:03pm until July 21, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Tonight

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 83. North wind 5 to 10 mph.

    High: 83 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming clear, with a low around 63. Northeast wind 3 to 8 mph.

    Low: 63 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 82. Calm wind becoming east around 5 mph in the morning.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 64. Northeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Partly Cloudy

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.

    High: 79 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 67. Northwest wind 5 to 14 mph, with gusts as high as 22 mph.
Wednesday
Mostly sunny, with a high near 83. North wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, then gradually becoming clear, with a low around 63. Northeast wind 3 to 8 mph.
Thursday
Sunny, with a high near 82. Calm wind becoming east around 5 mph in the morning.
Thursday Night
Partly cloudy, with a low around 64. Northeast wind around 5 mph becoming calm in the evening.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 71.
Sunday
Sunny, with a high near 95.
Sunday Night
Mostly clear, with a low around 78.
Monday
Sunny and hot, with a high near 99.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Peters MO
 38.78°N 90.59°W (Elev. 492 ft)
Last Update:
2:51 pm CDT Jul 21, 2026
Forecast Valid:
4pm CDT Jul 21, 2026-6pm CDT Jul 28, 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