Today | Weather | Wednesday, November 19, 2025

Weather in St. Louis, Missouri

02:31 PM
Now
Cloudy Weather
52° F
Feels Like 55°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 1
Humidity 81 %
Today
Cloudy Weather
Day 54°
Night 48°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 1

St. Louis Weather Forecast Updated

11 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 19, 2024)
Cloudy Night

Day

72°

Night

46°

Wind

7 mph

Precipitation

8 %

Air Quality in St. Louis

NOW
33 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 7.85 µg/m³
PM10 8.71 µg/m³
O3 0.028 ppm
NO2 3.8 ppb
SO2 1.2 ppb
CO 0.15 ppm
NH3 0 µg/m³
NO 0.76 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)
PM2.57.85 µg/m³
PM108.71 µg/m³
O354.01 µg/m³
NO27.13 µg/m³
SO23.03 µg/m³
CO176.38 µg/m³
NH30 µg/m³
NO0.76 µg/m³