Today | Weather | Thursday, February 5, 2026

Weather in St. Peters, Missouri

07:34 PM
Now
Cloudy Night
36° F
Feels Like 28°
Precipitation 0 %
Wind 8 mph
Humidity 75 %
Today
Cloudy Weather
Day 43°
Night 30°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 2

St. Peters Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (February 5, 2025)

Day

39°

Night

30°

Air Quality in St. Peters

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.9 µg/m³
PM10 7.89 µg/m³
O3 0.036 ppm
NO2 1.9 ppb
SO2 0.2 ppb
CO 0.16 ppm
NH3 0.63 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)
PM2.56.9 µg/m³
PM107.89 µg/m³
O371.1 µg/m³
NO23.58 µg/m³
SO20.64 µg/m³
CO186.07 µg/m³
NH30.63 µg/m³
NO0 µg/m³