Today | Weather | Sunday, November 1, 2026

Weather in St. Charles, Missouri

10:32 PM
Now
Cloudy Weather
59° F
Feels Like 55°
Precipitation 5 %
Wind 8 mph
Humidity 91 %
Today
Cloudy Weather
Day 63°
Night 59°
Precipitation 8 %
Wind 8 mph

St. Charles Weather Forecast Updated

36 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 1, 2025)
Cloudy Night

Day

54°

Night

34°

Wind

5 mph

Precipitation

49 %

Air Quality in St. Charles

NOW
25 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.12 µg/m³
PM10 4.3 µg/m³
O3 0.027 ppm
NO2 1.1 ppb
SO2 0.3 ppb
CO 0.15 ppm
NH3 0.06 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)
PM2.5 – 4.12 µg/m³
PM10 – 4.3 µg/m³
O3 – 53.19 µg/m³
NO2 – 2.12 µg/m³
SO2 – 0.67 µg/m³
CO – 167.04 µg/m³
NH3 – 0.06 µg/m³
NO – 0 µg/m³