Today | Weather | Wednesday, February 25, 2026

Weather in St. Peters, Missouri

10:21 PM
Now
Cloudy Weather
43° F
Feels Like 37°
Precipitation 47 %
Wind 7 mph
Humidity 65 %
Today
Partly Sunny with Showers
Day 57°
Night 34°
Precipitation 49 %
Wind 4 mph
UV Index (0 - 11+) 4

St. Peters Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (February 25, 2025)

Day

64°

Night

30°

Air Quality in St. Peters

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

Pollutant Concentrations:

PM2.5 9.61 µg/m³
PM10 11.31 µg/m³
O3 0.035 ppm
NO2 3.9 ppb
SO2 0.8 ppb
CO 0.18 ppm
NH3 0.54 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)
PM2.59.61 µg/m³
PM1011.31 µg/m³
O369.56 µg/m³
NO27.37 µg/m³
SO22.08 µg/m³
CO208.45 µg/m³
NH30.54 µg/m³
NO0 µg/m³