Today | Weather | Sunday, October 25, 2026

Weather in St. Louis, Missouri

11:32 PM
Today
Cloudy Night
Day 81°
Night 52°
Precipitation 1 %
Wind 4 mph

St. Louis Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 25, 2025)
Rainy Weather

Day

61°

Night

50°

Wind

7 mph

Precipitation

87 %

Air Quality in St. Louis

NOW
54 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 13.75 µg/m³
PM10 14.33 µg/m³
O3 0.033 ppm
NO2 1.4 ppb
SO2 0.1 ppb
CO 0.14 ppm
NH3 0.99 µg/m³
NO 0 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 13.75 µg/m³
PM10 – 14.33 µg/m³
O3 – 65.27 µg/m³
NO2 – 2.64 µg/m³
SO2 – 0.33 µg/m³
CO – 162.98 µg/m³
NH3 – 0.99 µg/m³
NO – 0 µg/m³