Hourly Weather | Today Thursday, July 16, 2026
St. Louis, Missouri
2 AM
Cloudy Night
75°
Feels Like 82°
7
Humidity: 86%
UV Index: 0
Wind: 4 mph
3 AM
Cloudy Night
75°
Feels Like 84°
7
Humidity: 91%
UV Index: 0
Wind: 2 mph
4 AM
Cloudy Night
75°
Feels Like 84°
7
Humidity: 92%
UV Index: 0
Wind: 2 mph
5 AM
Cloudy Night
73°
Feels Like 82°
7
Humidity: 97%
UV Index: 0
Wind: 2 mph
6 AM
Cloudy Weather
75°
Feels Like 84°
7
Humidity: 93%
UV Index: 0
Wind: 2 mph
7 AM
Cloudy Weather
77°
Feels Like 88°
7
Humidity: 91%
UV Index: 1
Wind: 2 mph
8 AM
Cloudy Weather
75°
Feels Like 86°
7
Humidity: 88%
UV Index: 2
Wind: 4 mph
9 AM
Cloudy Weather
79°
Feels Like 91°
7
Humidity: 82%
UV Index: 3
Wind: 4 mph
10 AM
Cloudy Weather
82°
Feels Like 97°
6
Humidity: 77%
UV Index: 4
Wind: 5 mph
11 AM
Cloudy Weather
84°
Feels Like 99°
5
Humidity: 70%
UV Index: 5
Wind: 5 mph
12 PM
Cloudy Weather
88°
Feels Like 100°
5
Humidity: 63%
UV Index: 6
Wind: 6 mph
1 PM
Cloudy Weather
90°
Feels Like 102°
8
Humidity: 56%
UV Index: 5
Wind: 6 mph
2 PM
Cloudy Weather
88°
Feels Like 102°
43
Humidity: 70%
UV Index: 5
Wind: 6 mph
3 PM
Cloudy Weather
84°
Feels Like 99°
47
Humidity: 71%
UV Index: 4
Wind: 6 mph
4 PM
Sunny with a Chance of Thunderstorms
84°
Feels Like 93°
51
Humidity: 81%
UV Index: 2
Wind: 6 mph
5 PM
Cloudy Weather
82°
Feels Like 99°
19
Humidity: 91%
UV Index: 2
Wind: 5 mph
6 PM
Cloudy Weather
82°
Feels Like 91°
15
Humidity: 73%
UV Index: 1
Wind: 5 mph
7 PM
Cloudy Weather
82°
Feels Like 90°
19
Humidity: 71%
UV Index: 1
Wind: 5 mph
8 PM
Cloudy Weather
84°
Feels Like 90°
47
Humidity: 69%
UV Index: 0
Wind: 5 mph
9 PM
Stormy Weather
82°
Feels Like 86°
51
Humidity: 75%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Weather
81°
Feels Like 86°
47
Humidity: 78%
UV Index: 0
Wind: 4 mph
11 PM
Cloudy Night
79°
Feels Like 88°
31
Humidity: 88%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 5.11 µg/m³
  • PM10: 5.26 µg/m³
  • O3: 0.010 ppm
  • NO2: 0.8 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.11 µg/m³
  • PM10: 5.24 µg/m³
  • O3: 0.008 ppm
  • NO2: 0.7 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.11 µg/m³
  • PM10: 5.22 µg/m³
  • O3: 0.007 ppm
  • NO2: 0.6 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.04 µg/m³
  • PM10: 5.14 µg/m³
  • O3: 0.007 ppm
  • NO2: 0.5 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.93 µg/m³
  • PM10: 5.01 µg/m³
  • O3: 0.007 ppm
  • NO2: 0.5 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.8 µg/m³
  • PM10: 4.87 µg/m³
  • O3: 0.007 ppm
  • NO2: 0.6 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.6 µg/m³
  • PM10: 4.67 µg/m³
  • O3: 0.008 ppm
  • NO2: 0.8 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.41 µg/m³
  • PM10: 4.48 µg/m³
  • O3: 0.011 ppm
  • NO2: 0.8 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.32 µg/m³
  • PM10: 4.39 µg/m³
  • O3: 0.016 ppm
  • NO2: 0.7 ppb
  • SO2: 0 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.38 µg/m³
  • PM10: 4.47 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.8 µg/m³
  • PM10: 3.88 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.55 µg/m³
  • PM10: 3.62 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.42 µg/m³
  • PM10: 3.48 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.2 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
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.32 µg/m³
  • PM10: 3.37 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.2 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
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.26 µg/m³
  • PM10: 3.3 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.3 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
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.26 µg/m³
  • PM10: 3.29 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.3 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
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.27 µg/m³
  • PM10: 3.3 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.4 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
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.31 µg/m³
  • PM10: 3.34 µg/m³
  • O3: 0.032 ppm
  • NO2: 0.4 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
24 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.39 µg/m³
  • PM10: 3.43 µg/m³
  • O3: 0.026 ppm
  • NO2: 0.7 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.53 µg/m³
  • PM10: 3.58 µg/m³
  • O3: 0.018 ppm
  • NO2: 1 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

10 PM
15 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.65 µg/m³
  • PM10: 3.7 µg/m³
  • O3: 0.013 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

11 PM
15 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 3.66 µg/m³
  • PM10: 3.71 µg/m³
  • O3: 0.009 ppm
  • NO2: 1.1 ppb
  • SO2: 0 ppb
  • CO: 0.12 ppm

Health Recommendations:

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