Hourly Weather | Today Wednesday, May 20, 2026
St. Peters, Missouri
8 PM
Cloudy Weather
66°
Feels Like 63°
0
Humidity: 68%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Weather
64°
Feels Like 64°
0
Humidity: 72%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 76%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
63°
Feels Like 61°
0
Humidity: 78%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 PM
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.46 µg/m³
  • PM10: 4.88 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.1 ppb
  • SO2: 1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
29 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.68 µg/m³
  • PM10: 5.15 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.4 ppb
  • SO2: 1.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.86 µg/m³
  • PM10: 5.37 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.5 ppb
  • SO2: 1.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
26 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.99 µg/m³
  • PM10: 5.53 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.6 ppb
  • SO2: 1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.