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

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

74°F

23°C

Humidity 79%
Wind Speed S 3 mph
Barometer 30.07 in (1017.5 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 21 Aug 8:54 am CDT
Extended Forecast for

Saint Peters MO

  • Today

    Today: Sunny, with a high near 86. Calm wind becoming west around 5 mph in the afternoon.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 69. Light southwest wind.

    Low: 69 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 85. Northwest wind 5 to 9 mph.

    High: 85 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. North wind 5 to 7 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 82. Light north wind.

    High: 82 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 64.

    Low: 64 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 81.

    High: 81 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 86. Calm wind becoming west around 5 mph in the afternoon.
Tonight
Increasing clouds, with a low around 69. Light southwest wind.
Saturday
Sunny, with a high near 85. Northwest wind 5 to 9 mph.
Saturday Night
Mostly clear, with a low around 64. North wind 5 to 7 mph becoming calm in the evening.
Sunday
Sunny, with a high near 82. Light north wind.
Sunday Night
Mostly cloudy, with a low around 64.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 81.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
Partly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 86.
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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:
6:06 am CDT Aug 21, 2026
Forecast Valid:
9am CDT Aug 21, 2026-6pm CDT Aug 27, 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