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.

Mostly Cloudy

83°F

28°C

Humidity 36%
Wind Speed Calm
Barometer 30.02 in (1015.8 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 19 Jun 3:51 pm CDT
Extended Forecast for

Saint John MO

  • Tonight

    Tonight: Mostly cloudy, with a low around 66. Light and variable wind.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Isolated showers before 10am. Partly sunny, with a high near 86. Light and variable wind. Chance of precipitation is 20%.

    High: 86 °F

    Isolated
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 68. Light and variable wind becoming southeast around 5 mph after midnight. Chance of precipitation is 40%.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 7am, then showers and thunderstorms after 7am. High near 82. Southeast wind 7 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%.

    High: 82 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 66. West wind around 10 mph becoming northwest after midnight. Chance of precipitation is 90%.

    Low: 66 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 66. Light and variable wind.
Saturday
Isolated showers before 10am. Partly sunny, with a high near 86. Light and variable wind. Chance of precipitation is 20%.
Saturday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 68. Light and variable wind becoming southeast around 5 mph after midnight. Chance of precipitation is 40%.
Sunday
Showers and possibly a thunderstorm before 7am, then showers and thunderstorms after 7am. High near 82. Southeast wind 7 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 66. West wind around 10 mph becoming northwest after midnight. Chance of precipitation is 90%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Sunny, with a high near 83.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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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:
2:31 pm CDT Jun 19, 2026
Forecast Valid:
4pm CDT Jun 19, 2026-6pm CDT Jun 26, 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