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

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

79°F

26°C

Humidity 30%
Wind Speed S 9 mph
Barometer 30.15 in (1020.1 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 9 Oct 10:51 am CDT
Extended Forecast for

Saint John MO

  • Today

    Today: Sunny, with a high near 88. South wind 7 to 10 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 62. South wind 5 to 7 mph.

    Low: 62 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 82. Southeast wind 5 to 8 mph.

    High: 82 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 60. East wind 3 to 8 mph.

    Low: 60 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 83. Light and variable wind becoming northwest around 5 mph in the afternoon.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 88. South wind 7 to 10 mph.
Tonight
Increasing clouds, with a low around 62. South wind 5 to 7 mph.
Saturday
Mostly cloudy, with a high near 82. Southeast wind 5 to 8 mph.
Saturday Night
Mostly cloudy, with a low around 60. East wind 3 to 8 mph.
Sunday
Sunny, with a high near 83. Light and variable wind becoming northwest around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 63.
Columbus Day
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 70.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 65.
Wednesday
A 50 percent chance of showers. Mostly sunny, with a high near 84.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint John MO
 38.71°N 90.34°W (Elev. 597 ft)
Last Update:
9:21 am CDT Oct 9, 2026
Forecast Valid:
11am CDT Oct 9, 2026-6pm CDT Oct 15, 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