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.

Partly Cloudy with Haze

85°F

29°C

Humidity 75%
Wind Speed Calm
Barometer 29.96 in (1013.4 mb)
Dewpoint 76°F (24°C)
Visibility 6.00 mi
Heat Index95°F (35°C)
Last update 19 Jul 9:54 am CDT
Extended Forecast for

Saint Peters MO

Heat Advisory July 19, 09:58am until July 21, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 19, 09:58am until July 21, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Today

    High: 90 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Clear, then becoming mostly cloudy toward daybreak, with a low around 72. Northeast wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 102. Calm wind.

    High: 92 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. Calm wind becoming southwest around 6 mph after midnight.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Southwest wind 6 to 10 mph becoming northwest in the afternoon.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Today
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 90. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 50%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Clear, then becoming mostly cloudy toward daybreak, with a low around 72. Northeast wind around 5 mph becoming calm in the evening.
Monday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 102. Calm wind.
Monday Night
Mostly clear, with a low around 77. Calm wind becoming southwest around 6 mph after midnight.
Tuesday
Sunny, with a high near 95. Southwest wind 6 to 10 mph becoming northwest in the afternoon.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Partly cloudy, with a low around 67.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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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:
9:31 am CDT Jul 19, 2026
Forecast Valid:
9am CDT Jul 19, 2026-6pm CDT Jul 25, 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