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.

Fair

66°F

19°C

Humidity	87%
Wind Speed	SE 12 mph
Barometer	29.96 in (1014.1 mb)
Dewpoint	62°F (17°C)
Visibility	10.00 mi
Last update	18 May 9:53 pm CDT

More Information:

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

Extended Forecast for

2 Miles NE O'Fallon IL

Flood Watch May 18, 10:18pm until May 19, 01:00pm

Flood Advisory until May 19, 12:00am

Click here for hazard details and duration

Flood Watch

Flood Advisory

Flood Watch May 18, 10:18pm until May 19, 01:00pm
Flood Advisory until May 19, 12:00am
NOW: Multiple hazards in effect
Click HERE for Details
Tonight
Low: 66 °F
Mostly Cloudy
then Slight
Chance
T-storms
Tuesday
High: 82 °F
Chance
T-storms then
T-storms
Likely
Tuesday Night
Low: 58 °F
T-storms then
Showers
Wednesday
High: 70 °F
Slight Chance
Showers
Wednesday Night
Low: 52 °F
Mostly Cloudy
Thursday
High: 73 °F
Partly Sunny
Thursday Night
Low: 58 °F
Mostly Cloudy
then Chance
Showers
Friday
High: 75 °F
Showers
Likely

Detailed Forecast

Tonight

A slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 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 20%.

Tuesday

Showers and thunderstorms likely, mainly after 4pm. Mostly cloudy, with a high near 82. Southwest wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

Tuesday Night

Showers and thunderstorms likely before 11pm, then showers and possibly a thunderstorm between 11pm and 4am, then showers after 4am. Low around 58. North wind 7 to 10 mph. Chance of precipitation is 80%.

Wednesday

A 20 percent chance of showers. Mostly cloudy, with a high near 70. North wind 8 to 10 mph.

Wednesday Night

Mostly cloudy, with a low around 52. Northeast wind around 8 mph.

Thursday

Partly sunny, with a high near 73.

Thursday Night

A 50 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58.

Friday

Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.

Friday Night

A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 61.