Today | Weather | Monday, November 2, 2026

Weather in St. Charles, Missouri

12:28 AM
Now
Cloudy Night
64° F
Feels Like 63°
Precipitation 10 %
Wind 15 mph
Humidity 88 %
Today
Cloudy Weather
Day 72°
Night 64°
Precipitation 25 %
Wind 13 mph
UV Index (0 - 11+) 1

St. Charles Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 2, 2025)
Night

Day

54°

Night

39°

Wind

6 mph

Precipitation

0 %

Air Quality in St. Charles

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.96 µg/m³
PM10 4.14 µg/m³
O3 0.026 ppm
NO2 1.1 ppb
SO2 0.2 ppb
CO 0.15 ppm
NH3 0.05 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 – 3.96 µg/m³
PM10 – 4.14 µg/m³
O3 – 50.64 µg/m³
NO2 – 2.06 µg/m³
SO2 – 0.63 µg/m³
CO – 167.26 µg/m³
NH3 – 0.05 µg/m³
NO – 0 µg/m³