Hourly Weather | Today Thursday, December 11, 2025
St. Louis, Missouri
8 AM
Cloudy Weather
28°
Feels Like 27°
0
Humidity: 80%
Wind: 5 mph
UV Index: 0
9 AM
Cloudy Weather
28°
Feels Like 28°
0
Humidity: 78%
Wind: 5 mph
UV Index: 0
10 AM
Cloudy Weather
30°
Feels Like 28°
0
Humidity: 74%
Wind: 6 mph
UV Index: 1
11 AM
Cloudy Weather
32°
Feels Like 30°
0
Humidity: 70%
Wind: 6 mph
UV Index: 1
12 PM
Cloudy Weather
34°
Feels Like 32°
2
Humidity: 67%
Wind: 6 mph
UV Index: 1
1 PM
Cloudy Weather
36°
Feels Like 32°
7
Humidity: 64%
Wind: 7 mph
UV Index: 1
2 PM
Cloudy Weather
36°
Feels Like 30°
7
Humidity: 62%
Wind: 7 mph
UV Index: 1
3 PM
Cloudy Weather
36°
Feels Like 30°
7
Humidity: 62%
Wind: 8 mph
UV Index: 0
4 PM
Cloudy Weather
37°
Feels Like 32°
7
Humidity: 61%
Wind: 8 mph
UV Index: 0
5 PM
Cloudy Weather
37°
Feels Like 30°
7
Humidity: 67%
Wind: 8 mph
UV Index: 0
6 PM
Cloudy Weather
36°
Feels Like 28°
6
Humidity: 70%
Wind: 8 mph
UV Index: 0
7 PM
Cloudy Weather
36°
Feels Like 30°
2
Humidity: 72%
Wind: 8 mph
UV Index: 0
8 PM
Cloudy Weather
36°
Feels Like 30°
2
Humidity: 74%
Wind: 8 mph
UV Index: 0
9 PM
Cloudy Weather
36°
Feels Like 30°
2
Humidity: 76%
Wind: 8 mph
UV Index: 0
10 PM
Cloudy Weather
36°
Feels Like 30°
2
Humidity: 78%
Wind: 7 mph
UV Index: 0
11 PM
Cloudy Weather
34°
Feels Like 30°
2
Humidity: 82%
Wind: 6 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

8 AM
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.8 µg/m³
  • PM10: 2.02 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

9 AM
23 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.51 µg/m³
  • PM10: 1.72 µg/m³
  • O3: 0.025 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

10 AM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.08 µg/m³
  • PM10: 1.27 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

11 AM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.71 µg/m³
  • PM10: 0.88 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.57 µg/m³
  • PM10: 0.71 µg/m³
  • O3: 0.028 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.54 µg/m³
  • PM10: 0.67 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.61 µg/m³
  • PM10: 0.73 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.72 µg/m³
  • PM10: 0.85 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.89 µg/m³
  • PM10: 1.07 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.18 µg/m³
  • PM10: 1.39 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.59 µg/m³
  • PM10: 1.85 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.05 µg/m³
  • PM10: 2.36 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.52 µg/m³
  • PM10: 2.88 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 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: 3.01 µg/m³
  • PM10: 3.41 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 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: 3.4 µg/m³
  • PM10: 3.85 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.63 µg/m³
  • PM10: 4.12 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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