Today | Weather | Wednesday, December 24, 2025

Weather in St. Peters, Missouri

12:06 PM
Now
Cloudy Weather
61° F
Feels Like 55°
Precipitation 37 %
Wind 16 mph
UV Index (0 - 11+) 1
Humidity 77 %
Today
Rainy Weather
Day 68°
Night 54°
Precipitation 41 %
Wind 12 mph
UV Index (0 - 11+) 1

St. Peters Weather Forecast Updated

48 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 24, 2024)

Day

46°

Night

37°

Air Quality in St. Peters

NOW
16 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.8 µg/m³
PM10 2.26 µg/m³
O3 0.018 ppm
NO2 1.1 ppb
SO2 0 ppb
CO 0.13 ppm
NH3 0.13 µg/m³
NO 0.31 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)
PM2.51.8 µg/m³
PM102.26 µg/m³
O334.72 µg/m³
NO21.99 µg/m³
SO20.12 µg/m³
CO144.83 µg/m³
NH30.13 µg/m³
NO0.31 µg/m³