Hourly Weather | Today Wednesday, December 24, 2025
O'Fallon, Missouri
2 PM
Cloudy Weather
66°
Feels Like 63°
7
Humidity: 72%
Wind: 16 mph
UV Index: 1
3 PM
Cloudy Weather
66°
Feels Like 63°
7
Humidity: 71%
Wind: 15 mph
UV Index: 0
4 PM
Cloudy Weather
68°
Feels Like 64°
7
Humidity: 69%
Wind: 15 mph
UV Index: 0
5 PM
Cloudy Night
66°
Feels Like 63°
7
Humidity: 75%
Wind: 15 mph
UV Index: 0
6 PM
Cloudy Night
63°
Feels Like 57°
5
Humidity: 81%
Wind: 15 mph
UV Index: 0
7 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 83%
Wind: 8 mph
UV Index: 0
8 PM
Cloudy Night
59°
Feels Like 55°
0
Humidity: 91%
Wind: 8 mph
UV Index: 0
9 PM
Cloudy Night
59°
Feels Like 55°
0
Humidity: 88%
Wind: 8 mph
UV Index: 0
10 PM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 92%
Wind: 8 mph
UV Index: 0
11 PM
Cloudy Night
59°
Feels Like 55°
0
Humidity: 93%
Wind: 7 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.53 µg/m³
  • PM10: 3.22 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

3 PM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.88 µg/m³
  • PM10: 3.67 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.22 µg/m³
  • PM10: 4.12 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.57 µg/m³
  • PM10: 4.57 µg/m³
  • O3: 0.030 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.85 µg/m³
  • PM10: 4.96 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.88 µg/m³
  • PM10: 5.06 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.74 µg/m³
  • PM10: 4.97 µg/m³
  • O3: 0.031 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 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: 3.48 µg/m³
  • PM10: 4.74 µg/m³
  • O3: 0.031 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.23 µg/m³
  • PM10: 4.54 µg/m³
  • O3: 0.031 ppm
  • NO2: 0.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.17 µg/m³
  • PM10: 4.56 µg/m³
  • O3: 0.031 ppm
  • NO2: 0.8 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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