Today | Weather | Tuesday, January 13, 2026

Weather in St. Peters, Missouri

04:03 PM
Now
Cloudy Weather
64° F
Feels Like 61°
Precipitation 22 %
Wind 14 mph
UV Index (0 - 11+) 0
Humidity 34 %
Today
Partly Sunny with Showers
Day 64°
Night 36°
Precipitation 49 %
Wind 12 mph
UV Index (0 - 11+) 2

St. Peters Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 13, 2025)

Day

28°

Night

Air Quality in St. Peters

NOW
41 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.52 µg/m³
PM10 6.33 µg/m³
O3 0.044 ppm
NO2 1.5 ppb
SO2 0.6 ppb
CO 0.13 ppm
NH3 0.73 µg/m³
NO 0.11 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)
PM2.54.52 µg/m³
PM106.33 µg/m³
O386.7 µg/m³
NO22.74 µg/m³
SO21.46 µg/m³
CO147.66 µg/m³
NH30.73 µg/m³
NO0.11 µg/m³