Today | Weather | Monday, October 5, 2026

Weather in St. Louis, Missouri

06:24 PM
Now
Sunny Weather
73° F
Feels Like 72°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 37 %
Today
Sunny Weather
Day 79°
Night 46°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 4

St. Louis Weather Forecast Updated

57 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 5, 2025)
Night

Day

86°

Night

63°

Wind

6 mph

Precipitation

6 %

Air Quality in St. Louis

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.3 µg/m³
PM10 5.88 µg/m³
O3 0.042 ppm
NO2 1.7 ppb
SO2 0.7 ppb
CO 0.13 ppm
NH3 0.89 µg/m³
NO 0.2 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)
PM2.5 – 5.3 µg/m³
PM10 – 5.88 µg/m³
O3 – 83.16 µg/m³
NO2 – 3.14 µg/m³
SO2 – 1.91 µg/m³
CO – 146.48 µg/m³
NH3 – 0.89 µg/m³
NO – 0.2 µg/m³