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 and Breezy

30°F

-1°C

Humidity 66%
Wind Speed W 23 G 33 mph
Barometer 29.81 in (1009.6 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 20 Feb 6:51 am CST
Extended Forecast for

Saint John MO

  • Today

    Today: Sunny, with a high near 42. Breezy, with a west wind 10 to 20 mph, with gusts as high as 37 mph.

    High: 42 °F

    Mostly Sunny
    and Breezy
    then Sunny

  • Tonight

    Tonight: A 20 percent chance of snow after 4am. Increasing clouds, with a low around 28. North wind around 7 mph.

    Low: 28 °F

    Partly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A 20 percent chance of snow before 7am. Partly sunny, with a high near 44. Northwest wind 8 to 10 mph.

    High: 44 °F

    Slight Chance
    Snow then
    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 37. Northwest wind 14 to 18 mph, with gusts as high as 31 mph.

    High: 37 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 20.

    Low: 20 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 42. Breezy, with a west wind 10 to 20 mph, with gusts as high as 37 mph.
Tonight
A 20 percent chance of snow after 4am. Increasing clouds, with a low around 28. North wind around 7 mph.
Saturday
A 20 percent chance of snow before 7am. Partly sunny, with a high near 44. Northwest wind 8 to 10 mph.
Saturday Night
Mostly clear, with a low around 25. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 37. Northwest wind 14 to 18 mph, with gusts as high as 31 mph.
Sunday Night
Mostly clear, with a low around 18.
Monday
Sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 20.
Tuesday
Partly sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Mostly cloudy, with a high near 59.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 36.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 55.
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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:
4:51 am CST Feb 20, 2026
Forecast Valid:
6am CST Feb 20, 2026-6pm CST Feb 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