Hourly Weather | Today Tuesday, August 25, 2026
St. Louis, Missouri
4 AM
Cloudy Night
66°
Feels Like 64°
0
Humidity: 88%
UV Index: 0
Wind: 5 mph
5 AM
Cloudy Night
64°
Feels Like 64°
0
Humidity: 84%
UV Index: 0
Wind: 5 mph
6 AM
Cloudy Night
64°
Feels Like 64°
0
Humidity: 85%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
66°
Feels Like 64°
0
Humidity: 82%
UV Index: 1
Wind: 6 mph
8 AM
Cloudy Weather
68°
Feels Like 68°
0
Humidity: 78%
UV Index: 1
Wind: 6 mph
9 AM
Cloudy Weather
72°
Feels Like 73°
0
Humidity: 73%
UV Index: 3
Wind: 6 mph
10 AM
Cloudy Weather
73°
Feels Like 79°
0
Humidity: 67%
UV Index: 4
Wind: 6 mph
11 AM
Cloudy Weather
77°
Feels Like 82°
0
Humidity: 62%
UV Index: 5
Wind: 6 mph
12 PM
Cloudy Weather
81°
Feels Like 88°
0
Humidity: 57%
UV Index: 7
Wind: 6 mph
1 PM
Cloudy Weather
82°
Feels Like 91°
0
Humidity: 54%
UV Index: 8
Wind: 7 mph
2 PM
Cloudy Weather
84°
Feels Like 91°
0
Humidity: 52%
UV Index: 7
Wind: 7 mph
3 PM
Cloudy Weather
84°
Feels Like 91°
0
Humidity: 51%
UV Index: 5
Wind: 7 mph
4 PM
Cloudy Weather
88°
Feels Like 91°
0
Humidity: 50%
UV Index: 4
Wind: 7 mph
5 PM
Cloudy Weather
86°
Feels Like 90°
0
Humidity: 53%
UV Index: 3
Wind: 7 mph
6 PM
Cloudy Weather
84°
Feels Like 86°
0
Humidity: 56%
UV Index: 2
Wind: 7 mph
7 PM
Cloudy Weather
82°
Feels Like 82°
0
Humidity: 61%
UV Index: 1
Wind: 7 mph
8 PM
Night
79°
Feels Like 81°
0
Humidity: 68%
UV Index: 0
Wind: 6 mph
9 PM
Night
77°
Feels Like 79°
0
Humidity: 72%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
75°
Feels Like 75°
0
Humidity: 77%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
73°
Feels Like 73°
0
Humidity: 81%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 7.42 µg/m³
  • PM10: 8.26 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.8 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.48 µg/m³
  • PM10: 8.29 µg/m³
  • O3: 0.026 ppm
  • NO2: 0.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.57 µg/m³
  • PM10: 8.39 µg/m³
  • O3: 0.025 ppm
  • NO2: 0.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.72 µg/m³
  • PM10: 8.56 µg/m³
  • O3: 0.025 ppm
  • NO2: 0.9 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 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: 7.88 µg/m³
  • PM10: 8.76 µg/m³
  • O3: 0.026 ppm
  • NO2: 1.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.13 µg/m³
  • PM10: 9.07 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.58 µg/m³
  • PM10: 9.55 µg/m³
  • O3: 0.030 ppm
  • NO2: 1 ppb
  • SO2: 0.9 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.45 µg/m³
  • PM10: 10.37 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.7 ppb
  • SO2: 1.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

12 PM
42 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.06 µg/m³
  • PM10: 10.94 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.5 ppb
  • SO2: 1.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

1 PM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.58 µg/m³
  • PM10: 11.43 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.4 ppb
  • SO2: 1.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.3 µg/m³
  • PM10: 10.94 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.3 ppb
  • SO2: 1.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.81 µg/m³
  • PM10: 10.35 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.3 ppb
  • SO2: 1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.68 µg/m³
  • PM10: 10.19 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.87 µg/m³
  • PM10: 10.38 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.4 ppb
  • SO2: 0.8 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

6 PM
42 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.17 µg/m³
  • PM10: 10.7 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

7 PM
43 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.4 µg/m³
  • PM10: 10.96 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

8 PM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.58 µg/m³
  • PM10: 11.2 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.9 ppb
  • SO2: 0.6 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

9 PM
45 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.85 µg/m³
  • PM10: 11.57 µg/m³
  • O3: 0.037 ppm
  • NO2: 1 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.17 µg/m³
  • PM10: 12 µg/m³
  • O3: 0.035 ppm
  • NO2: 1 ppb
  • SO2: 0.5 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.38 µg/m³
  • PM10: 12.32 µg/m³
  • O3: 0.032 ppm
  • NO2: 1 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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