Today | Weather | Thursday, December 4, 2025

Weather in St. Peters, Missouri

04:04 AM
Now
Cloudy Weather
21° F
Feels Like
Precipitation 7 %
Wind 12 mph
Humidity 81 %
Today
Cold Day
Day 23°
Night 10°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 2

St. Peters Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)

Day

55°

Night

30°

Air Quality in St. Peters

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

Pollutant Concentrations:

PM2.5 7 µg/m³
PM10 7.32 µg/m³
O3 0.029 ppm
NO2 2.1 ppb
SO2 0.3 ppb
CO 0.17 ppm
NH3 0.08 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)
PM2.57 µg/m³
PM107.32 µg/m³
O356.76 µg/m³
NO23.91 µg/m³
SO20.79 µg/m³
CO192.95 µg/m³
NH30.08 µg/m³
NO0 µg/m³