Hourly Weather | Today Thursday, February 26, 2026
St. Peters, Missouri
1 AM
Cloudy Weather
41°
Feels Like 36°
48
Humidity: 72%
UV Index: 0
Wind: 8 mph
2 AM
Rainy Weather
39°
Feels Like 30°
52
Humidity: 73%
UV Index: 0
Wind: 8 mph
3 AM
Cloudy Weather
37°
Feels Like 32°
48
Humidity: 75%
UV Index: 0
Wind: 8 mph
4 AM
Cloudy Weather
37°
Feels Like 30°
34
Humidity: 78%
UV Index: 0
Wind: 8 mph
5 AM
Cloudy Weather
36°
Feels Like 30°
34
Humidity: 80%
UV Index: 0
Wind: 8 mph
6 AM
Cloudy Weather
36°
Feels Like 28°
22
Humidity: 83%
UV Index: 0
Wind: 8 mph
7 AM
Cloudy Weather
34°
Feels Like 28°
0
Humidity: 87%
UV Index: 0
Wind: 8 mph
8 AM
Cloudy Weather
36°
Feels Like 32°
0
Humidity: 82%
UV Index: 1
Wind: 8 mph
9 AM
Cloudy Weather
39°
Feels Like 37°
0
Humidity: 72%
UV Index: 1
Wind: 8 mph
10 AM
Cloudy Weather
43°
Feels Like 43°
0
Humidity: 64%
UV Index: 2
Wind: 7 mph
11 AM
Cloudy Weather
48°
Feels Like 50°
0
Humidity: 55%
UV Index: 2
Wind: 7 mph
12 PM
Cloudy Weather
52°
Feels Like 54°
0
Humidity: 50%
UV Index: 2
Wind: 6 mph
1 PM
Cloudy Weather
55°
Feels Like 59°
0
Humidity: 46%
UV Index: 3
Wind: 6 mph
2 PM
Cloudy Weather
57°
Feels Like 63°
0
Humidity: 42%
UV Index: 3
Wind: 4 mph
3 PM
Cloudy Weather
59°
Feels Like 64°
0
Humidity: 41%
UV Index: 2
Wind: 4 mph
4 PM
Cloudy Weather
61°
Feels Like 64°
0
Humidity: 39%
UV Index: 1
Wind: 4 mph
5 PM
Sunny Weather
57°
Feels Like 59°
0
Humidity: 43%
UV Index: 1
Wind: 4 mph
6 PM
Night
55°
Feels Like 54°
0
Humidity: 49%
UV Index: 0
Wind: 4 mph
7 PM
Night
52°
Feels Like 52°
0
Humidity: 56%
UV Index: 0
Wind: 4 mph
8 PM
Night
50°
Feels Like 48°
0
Humidity: 61%
UV Index: 0
Wind: 6 mph
9 PM
Night
46°
Feels Like 45°
0
Humidity: 67%
UV Index: 0
Wind: 6 mph
10 PM
Night
45°
Feels Like 43°
0
Humidity: 71%
UV Index: 0
Wind: 6 mph
11 PM
Night
43°
Feels Like 39°
0
Humidity: 74%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 12.23 µg/m³
  • PM10: 14.17 µg/m³
  • O3: 0.032 ppm
  • NO2: 4.5 ppb
  • SO2: 1.1 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

2 AM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.33 µg/m³
  • PM10: 13.95 µg/m³
  • O3: 0.031 ppm
  • NO2: 4.2 ppb
  • SO2: 1 ppb
  • CO: 0.19 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

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

Pollutant Concentrations:

  • PM2.5: 11.94 µg/m³
  • PM10: 13.24 µg/m³
  • O3: 0.032 ppm
  • NO2: 3.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.43 µg/m³
  • PM10: 11.36 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.38 µg/m³
  • PM10: 9.02 µg/m³
  • O3: 0.035 ppm
  • NO2: 2.6 ppb
  • SO2: 0.6 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.91 µg/m³
  • PM10: 7.37 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.87 µg/m³
  • PM10: 6.25 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.03 µg/m³
  • PM10: 5.38 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.51 µg/m³
  • PM10: 4.85 µg/m³
  • O3: 0.038 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.3 µg/m³
  • PM10: 4.66 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.2 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
37 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.31 µg/m³
  • PM10: 4.69 µg/m³
  • O3: 0.040 ppm
  • NO2: 1 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.66 µg/m³
  • PM10: 5.06 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.54 µg/m³
  • PM10: 6.59 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.12 µg/m³
  • PM10: 7.51 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.43 µg/m³
  • PM10: 7.89 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.85 µg/m³
  • PM10: 8.31 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.27 µg/m³
  • PM10: 8.68 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.57 µg/m³
  • PM10: 8.95 µg/m³
  • O3: 0.041 ppm
  • NO2: 2.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.75 µg/m³
  • PM10: 9.07 µg/m³
  • O3: 0.038 ppm
  • NO2: 2.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.05 µg/m³
  • PM10: 9.34 µg/m³
  • O3: 0.036 ppm
  • NO2: 3.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.4 µg/m³
  • PM10: 9.69 µg/m³
  • O3: 0.034 ppm
  • NO2: 3.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 8.58 µg/m³
  • PM10: 9.83 µg/m³
  • O3: 0.032 ppm
  • NO2: 3.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.01 µg/m³
  • PM10: 10.25 µg/m³
  • O3: 0.030 ppm
  • NO2: 3.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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