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Active Weather Warnings

Weather in St. Louis, Missouri

09:37 AM
Now
Cloudy Weather
54° F
Feels Like 57°
Precipitation 22 %
Wind 8 mph
UV Index (0 - 11+) 4
Humidity 61 %
Today
Partly Sunny with Showers
Day 61°
Night 43°
Precipitation 55 %
Wind 9 mph
UV Index (0 - 11+) 6

St. Louis Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 2, 2025)
Rainy Weather

Day

68°

Night

54°

Wind

6 mph

UV Index

3

Precipitation

85 %

Air Quality in St. Louis

NOW
23 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.91 µg/m³
PM10 2.31 µg/m³
O3 0.025 ppm
NO2 1.6 ppb
SO2 0.4 ppb
CO 0.13 ppm
NH3 1.86 µg/m³
NO 1.29 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.51.91 µg/m³
PM102.31 µg/m³
O348.32 µg/m³
NO22.92 µg/m³
SO20.95 µg/m³
CO149.12 µg/m³
NH31.86 µg/m³
NO1.29 µg/m³

Weather Alerts and Warnings for St. Louis

Severe Immediate Observed

Flood Warning

Flood Warning issued April 30 at 1:03PM CDT until May 2 at 7:00PM CDT by NWS St Louis MO
Apr 30, 1:03 PM May 2, 7:00 PM
...The Flood Warning continues for the following rivers in
Missouri...Illinois...

Mississippi River at St. Louis.

Mississippi River near Herculaneum.

Mississippi River at Chester.

...The Flood Warning is extended for the following rivers in
Missouri...Illinois...

Mississippi River at Alton.

Mississippi River at Mel Price LD.

Mississippi River at Grafton.

River forecasts are based on observed precipitation and forecast
precipitation for the next 24 hours.

WHAT: Minor flooding is forecast.

WHERE: Mississippi River at St. Louis.

WHEN: Until Saturday evening.

IMPACTS: At 30.0 feet, Floodwall at Lacledes Landing is closed.
Also at this level, the U.S. Coast Guard may prohibit all
recreational vessel traffic from just above the Chain of Rocks
Canal south entry to just below the mouth of the Meramec River.

ADDITIONAL DETAILS:
- At 12:00 PM CDT Thursday the stage was 29.3 feet.
- Forecast...The river is expected to rise to a crest of 30.0 feet
early tomorrow afternoon.
- Flood stage is 30.0 feet.
+ Read More
Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Updated: Apr 30, 8:23 PM Source: NWS Alert