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NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Thunderstorm Light Rain Fog/Mist

67°F

19°C

Humidity 97%
Wind Speed N 12 mph
Barometer 30.01 in (1015.9 mb)
Dewpoint 66°F (19°C)
Visibility 6.00 mi
Last update 18 May 12:53 pm CDT
Extended Forecast for

Lemay MO

Flood Watch May 18, 01:07pm until May 18, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 18, 01:07pm until May 18, 07:00pm

    NOW until 7:00pm Mon

    Flood Watch

  • This Afternoon

    High: 78 °F

    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 10pm, then a slight chance of showers after 5am. Mostly cloudy, with a low around 67. South wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    Low: 67 °F

    Showers
    Likely then
    Mostly Cloudy

  • Tuesday

    Tuesday: Showers and thunderstorms before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 86. West wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.

    High: 86 °F

    Showers then
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 1am, then showers and possibly a thunderstorm between 1am and 4am, then showers after 4am. Low around 57. North wind 6 to 8 mph. Chance of precipitation is 80%.

    Low: 57 °F

    T-storms
    Likely then
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Partly sunny, with a high near 70. North wind around 8 mph.

    High: 70 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 74.

    High: 74 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.

    Low: 58 °F

    Slight Chance
    Showers then
    Showers
    Likely

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. High near 78. Southwest wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.
Tonight
Showers and thunderstorms likely before 10pm, then a slight chance of showers after 5am. Mostly cloudy, with a low around 67. South wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Tuesday
Showers and thunderstorms before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 86. West wind 9 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 80%.
Tuesday Night
Showers and thunderstorms likely before 1am, then showers and possibly a thunderstorm between 1am and 4am, then showers after 4am. Low around 57. North wind 6 to 8 mph. Chance of precipitation is 80%.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 70. North wind around 8 mph.
Wednesday Night
Mostly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 74.
Thursday Night
A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Sunday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lemay MO
 38.53°N 90.29°W (Elev. 456 ft)
Last Update:
12:11 pm CDT May 18, 2026
Forecast Valid:
1pm CDT May 18, 2026-6pm CDT May 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