Today | Weather | Monday, December 29, 2025

Weather in St. Louis, Missouri

11:10 PM
Now
Night
23° F
Feels Like
Precipitation 0 %
Wind 15 mph
Humidity 60 %
Today
Cloudy Night
Day 25°
Night 19°
Precipitation 0 %
Wind 15 mph

St. Louis Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 29, 2024)
Rainy Weather

Day

54°

Night

41°

Wind

11 mph

UV Index

1

Precipitation

82 %

Air Quality in St. Louis

NOW
30 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.07 µg/m³
PM10 1.24 µg/m³
O3 0.033 ppm
NO2 1.3 ppb
SO2 0.4 ppb
CO 0.13 ppm
NH3 0.5 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.51.07 µg/m³
PM101.24 µg/m³
O364.65 µg/m³
NO22.49 µg/m³
SO21.14 µg/m³
CO150.53 µg/m³
NH30.5 µg/m³
NO0 µg/m³