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

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

70°F

21°C

Humidity 87%
Wind Speed N 18 G 25 mph
Barometer 29.74 in (1006.9 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 2 Aug 1:53 am CDT
Extended Forecast for

Mehlville MO

  • Overnight

    Overnight: Drizzle likely, mainly before 3am. Cloudy, with a low around 67. North wind around 10 mph.

    Low: 67 °F

    Drizzle
    Likely

  • Sunday

    Sunday: A slight chance of drizzle before 10am. Partly sunny, with a high near 82. North wind around 10 mph, with gusts as high as 21 mph.

    High: 82 °F

    Slight Chance
    Drizzle then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66. North wind 5 to 7 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 85. Light north wind.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66. Light east wind.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Overnight
Drizzle likely, mainly before 3am. Cloudy, with a low around 67. North wind around 10 mph.
Sunday
A slight chance of drizzle before 10am. Partly sunny, with a high near 82. North wind around 10 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 66. North wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 85. Light north wind.
Monday Night
Mostly clear, with a low around 66. Light east wind.
Tuesday
Sunny, with a high near 88.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 91.
Wednesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Thursday
A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Saturday
Mostly sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mehlville MO
 38.51°N 90.32°W (Elev. 548 ft)
Last Update:
2:21 am CDT Aug 2, 2026
Forecast Valid:
2am CDT Aug 2, 2026-6pm CDT Aug 8, 2026
 
Forecast Discussion
 
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Additional Resources

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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