Hourly Weather | Today › Sunday, November 15, 2026
St. Louis, Missouri
5 AM
Night
28°
Feels Like 30°
0
Frost Risk: 100%
Humidity: 92%
UV Index: 0
Wind: 2 mph
6 AM
Night
28°
Feels Like 30°
0
Frost Risk: 99%
Humidity: 90%
UV Index: 0
Wind: 2 mph
7 AM
Cloudy Weather
30°
Feels Like 30°
0
Frost Risk: 84%
Humidity: 85%
UV Index: 0
Wind: 4 mph
8 AM
Cloudy Weather
32°
Feels Like 34°
0
Frost Risk: 50%
Humidity: 85%
UV Index: 1
Wind: 5 mph
9 AM
Cloudy Weather
37°
Feels Like 39°
0
Humidity: 74%
UV Index: 2
Wind: 5 mph
10 AM
Cloudy Weather
43°
Feels Like 46°
0
Humidity: 63%
UV Index: 2
Wind: 5 mph
11 AM
Cloudy Weather
46°
Feels Like 52°
0
Humidity: 55%
UV Index: 3
Wind: 5 mph
12 PM
Cloudy Weather
50°
Feels Like 55°
0
Humidity: 50%
UV Index: 3
Wind: 5 mph
1 PM
Cloudy Weather
52°
Feels Like 57°
0
Humidity: 47%
UV Index: 3
Wind: 5 mph
2 PM
Cloudy Weather
54°
Feels Like 57°
0
Humidity: 44%
UV Index: 2
Wind: 5 mph
3 PM
Cloudy Weather
52°
Feels Like 55°
0
Humidity: 47%
UV Index: 2
Wind: 5 mph
4 PM
Cloudy Weather
50°
Feels Like 52°
0
Humidity: 50%
UV Index: 1
Wind: 5 mph
5 PM
Cloudy Night
46°
Feels Like 46°
0
Humidity: 58%
UV Index: 0
Wind: 5 mph
6 PM
Cloudy Night
45°
Feels Like 45°
0
Humidity: 67%
UV Index: 0
Wind: 5 mph
7 PM
Night
41°
Feels Like 41°
0
Humidity: 74%
UV Index: 0
Wind: 5 mph
8 PM
Night
39°
Feels Like 37°
0
Humidity: 81%
UV Index: 0
Wind: 5 mph
9 PM
Night
37°
Feels Like 37°
0
Humidity: 83%
UV Index: 0
Wind: 5 mph
10 PM
Night
37°
Feels Like 36°
0
Humidity: 86%
UV Index: 0
Wind: 5 mph
11 PM
Night
36°
Feels Like 36°
0
Humidity: 89%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

5 AM
28 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.74 µg/m³
  • PM10: 8.48 µg/m³
  • O3: 0.019 ppm
  • NO2: 3.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

6 AM
31 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.52 µg/m³
  • PM10: 9.31 µg/m³
  • O3: 0.018 ppm
  • NO2: 3.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

7 AM
34 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.21 µg/m³
  • PM10: 10.07 µg/m³
  • O3: 0.017 ppm
  • NO2: 4.5 ppb
  • SO2: 0.6 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

8 AM
33 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.97 µg/m³
  • PM10: 9.89 µg/m³
  • O3: 0.017 ppm
  • NO2: 5.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

9 AM
32 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.59 µg/m³
  • PM10: 9.53 µg/m³
  • O3: 0.019 ppm
  • NO2: 4.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.19 µg/m³
  • PM10: 5.62 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.2 ppb
  • SO2: 1.8 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.3 µg/m³
  • PM10: 4.52 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.6 ppb
  • SO2: 1.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.11 µg/m³
  • PM10: 4.28 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.4 ppb
  • SO2: 1.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.8 µg/m³
  • PM10: 3.72 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.1 ppb
  • SO2: 1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.75 µg/m³
  • PM10: 3.51 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.8 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.83 µg/m³
  • PM10: 3.54 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3 µg/m³
  • PM10: 3.72 µg/m³
  • O3: 0.040 ppm
  • NO2: 1.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.25 µg/m³
  • PM10: 4.01 µg/m³
  • O3: 0.035 ppm
  • NO2: 2.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 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: 3.5 µg/m³
  • PM10: 4.29 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.69 µg/m³
  • PM10: 4.54 µg/m³
  • O3: 0.027 ppm
  • NO2: 4 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.92 µg/m³
  • PM10: 4.87 µg/m³
  • O3: 0.025 ppm
  • NO2: 4.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.15 µg/m³
  • PM10: 5.21 µg/m³
  • O3: 0.023 ppm
  • NO2: 4.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.28 µg/m³
  • PM10: 5.43 µg/m³
  • O3: 0.022 ppm
  • NO2: 4.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.38 µg/m³
  • PM10: 5.61 µg/m³
  • O3: 0.021 ppm
  • NO2: 4.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.18 ppm

Health Recommendations:

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