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

88°F

31°C

Humidity 54%
Wind Speed SW 17 G 26 mph
Barometer 29.41 in (995.2 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 17 Jun 5:54 pm CDT
Extended Forecast for

O'Fallon MO

Tornado Watch until June 17, 10:00pm
Wind Advisory June 17, 06:09pm until June 17, 08:00pm
Click here for hazard details and duration
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  •  
    Tornado Watch until June 17, 10:00pm
    Wind Advisory June 17, 06:09pm until June 17, 08:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 67 °F

    Severe
    Thunderstorms
    and Breezy
    then Partly
    Cloudy

  • Thursday

    Thursday: Isolated showers between 1pm and 4pm. Increasing clouds, with a high near 80. Northwest wind around 6 mph. Chance of precipitation is 20%.

    High: 80 °F

    Sunny then
    Isolated
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming clear, with a low around 58. Light north wind.

    Low: 58 °F

    Decreasing
    Clouds

  • Juneteenth

    Juneteenth: Sunny, with a high near 84. Calm wind.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 85.

    High: 85 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 83. Chance of precipitation is 80%.

    High: 83 °F

    Heavy Rain

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly before 11pm. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 67. Breezy, with a west wind 15 to 20 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 60%.
Thursday
Isolated showers between 1pm and 4pm. Increasing clouds, with a high near 80. Northwest wind around 6 mph. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, then gradually becoming clear, with a low around 58. Light north wind.
Juneteenth
Sunny, with a high near 84. Calm wind.
Friday Night
Partly cloudy, with a low around 64. Calm wind.
Saturday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 85.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Sunday
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 83. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 64. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 79.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
O'Fallon MO
 38.79°N 90.74°W (Elev. 597 ft)
Last Update:
5:51 pm CDT Jun 17, 2026
Forecast Valid:
6pm CDT Jun 17, 2026-6pm CDT Jun 24, 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