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 Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Thunderstorm Light Rain Fog/Mist

67°F

19°C

Humidity	93%
Wind Speed	N 3 mph
Barometer	30.03 in (1016.0 mb)
Dewpoint	65°F (18°C)
Visibility	6.00 mi
Last update	18 May 12:51 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Saint Charles MO

Flood Watch May 18, 01:09pm until May 18, 07:00pm

Click here for hazard details and duration

Flood Watch

Flood Watch May 18, 01:09pm until May 18, 07:00pm
NOW until 7:00pm Mon
Flood Watch
This Afternoon
High: 72 °F
T-storms
Tonight
Low: 66 °F
Showers
Likely then
Chance
T-storms
Tuesday
High: 84 °F
Showers then
T-storms
Tuesday Night
Low: 56 °F
Showers
Likely
Wednesday
High: 68 °F
Slight Chance
Showers
Wednesday Night
Low: 51 °F
Mostly Cloudy
Thursday
High: 73 °F
Partly Sunny
Thursday Night
Low: 56 °F
Slight Chance
Showers then
Chance
Showers

Detailed Forecast

This Afternoon

Showers and possibly a thunderstorm. Steady temperature around 72. South wind 11 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.

Tonight

Showers and thunderstorms likely, mainly before 4am. Mostly cloudy, with a low around 66. South wind 10 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

Tuesday

Showers and thunderstorms before 2pm, then showers and possibly a thunderstorm between 2pm and 3pm, then showers and thunderstorms likely after 3pm. High near 84. Southwest wind 9 to 13 mph becoming west in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.

Tuesday Night

Showers and thunderstorms likely before 11pm, then showers likely and possibly a thunderstorm between 11pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 56. North wind 7 to 9 mph. Chance of precipitation is 60%.

Wednesday

A 20 percent chance of showers. Partly sunny, with a high near 68. North wind 8 to 10 mph.

Wednesday Night

Mostly cloudy, with a low around 51.

Thursday

Partly sunny, with a high near 73.

Thursday Night

A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 56. Chance of precipitation is 50%.

Friday

Showers and possibly a thunderstorm. High near 74. Chance of precipitation is 80%.

Friday Night

A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.

Saturday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.

Saturday Night

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.

Sunday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.