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.

Fair

62°F

17°C

Humidity 62%
Wind Speed S 8 mph
Barometer 29.62 in (1002.7 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 15 Mar 1:54 am CDT
Extended Forecast for

O'Fallon MO

Wind Advisory March 15, 10:00am until March 16, 12:00pm
Click here for hazard details and duration
Wind Advisory

  • Overnight

    Overnight: Mostly cloudy, with a low around 56. South wind around 14 mph, with gusts as high as 25 mph.

    Low: 56 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain and thunderstorms likely, then rain and possibly a thunderstorm after 3pm. High near 67. Breezy, with a south wind 17 to 21 mph becoming west in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 90%.

    High: 67 °F

    Breezy.
    Chance
    T-storms then
    Rain

  • Sunday Night

    Sunday Night: Rain and snow likely before 4am, then a slight chance of snow between 4am and 5am. Mostly cloudy, with a low around 20. Blustery, with a northwest wind 24 to 28 mph, with gusts as high as 47 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 20 °F

    Rain/Snow
    Likely and
    Breezy then
    Chance Snow
    and Blustery

  • Monday

    Monday: A slight chance of snow between 7am and 1pm. Partly sunny, with a high near 30. Blustery, with a northwest wind 21 to 26 mph, with gusts as high as 45 mph. Chance of precipitation is 20%.

    High: 30 °F

    Slight Chance
    Snow and
    Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 14. Northwest wind 9 to 17 mph, with gusts as high as 29 mph.

    Low: 14 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of snow between 1am and 4am, then a chance of rain after 4am. Mostly cloudy, with a low around 32. Chance of precipitation is 30%.

    Low: 32 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 30 percent chance of rain before 7am. Mostly sunny, with a high near 65.

    High: 65 °F

    Chance Rain
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 56. South wind around 14 mph, with gusts as high as 25 mph.
Sunday
Rain and thunderstorms likely, then rain and possibly a thunderstorm after 3pm. High near 67. Breezy, with a south wind 17 to 21 mph becoming west in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 90%.
Sunday Night
Rain and snow likely before 4am, then a slight chance of snow between 4am and 5am. Mostly cloudy, with a low around 20. Blustery, with a northwest wind 24 to 28 mph, with gusts as high as 47 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Monday
A slight chance of snow between 7am and 1pm. Partly sunny, with a high near 30. Blustery, with a northwest wind 21 to 26 mph, with gusts as high as 45 mph. Chance of precipitation is 20%.
Monday Night
Mostly clear, with a low around 14. Northwest wind 9 to 17 mph, with gusts as high as 29 mph.
Tuesday
Mostly sunny, with a high near 39.
Tuesday Night
A chance of snow between 1am and 4am, then a chance of rain after 4am. Mostly cloudy, with a low around 32. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of rain before 7am. Mostly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Sunny, with a high near 72.
Thursday Night
Mostly clear, with a low around 46.
Friday
Mostly sunny, with a high near 76.
Friday Night
Mostly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon MO
 38.79°N 90.71°W (Elev. 535 ft)
Last Update:
2:11 am CDT Mar 15, 2026
Forecast Valid:
2am CDT Mar 15, 2026-6pm CDT Mar 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation