Today | Weather | Saturday, May 16, 2026

Weather in St. Louis, Missouri

06:16 PM
Now
Stormy Weather
77° F
Feels Like 75°
Precipitation 65 %
Wind 9 mph
UV Index (0 - 11+) 1
Humidity 71 %
Today
Stormy Weather
Day 79°
Night 66°
Precipitation 98 %
Wind 8 mph
UV Index (0 - 11+) 5

St. Louis Weather Forecast Updated

22 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 16, 2025)
Sunny with a Chance of Thunderstorms

Day

88°

Night

59°

Wind

12 mph

UV Index

10

Precipitation

85 %

Air Quality in St. Louis

NOW
46 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.81 µg/m³
PM10 2.07 µg/m³
O3 0.050 ppm
NO2 0.3 ppb
SO2 0.1 ppb
CO 0.09 ppm
NH3 1.36 µg/m³
NO 0.03 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)
PM2.51.81 µg/m³
PM102.07 µg/m³
O397.36 µg/m³
NO20.51 µg/m³
SO20.14 µg/m³
CO106.47 µg/m³
NH31.36 µg/m³
NO0.03 µg/m³