Hourly Weather | Today Friday, September 18, 2026
Centennial, Colorado
11 AM
Cloudy Weather
75°
Feels Like 81°
5
Humidity: 45%
UV Index: 4
Wind: 6 mph
12 PM
Cloudy Weather
79°
Feels Like 82°
5
Humidity: 39%
UV Index: 5
Wind: 6 mph
1 PM
Cloudy Weather
81°
Feels Like 82°
8
Humidity: 36%
UV Index: 5
Wind: 7 mph
2 PM
Cloudy Weather
79°
Feels Like 81°
19
Humidity: 37%
UV Index: 3
Wind: 8 mph
3 PM
Cloudy Weather
79°
Feels Like 77°
19
Humidity: 39%
UV Index: 2
Wind: 8 mph
4 PM
Cloudy Weather
77°
Feels Like 75°
24
Humidity: 41%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Weather
73°
Feels Like 73°
43
Humidity: 45%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
72°
Feels Like 70°
47
Humidity: 53%
UV Index: 1
Wind: 8 mph
7 PM
Stormy Weather
66°
Feels Like 61°
51
Humidity: 72%
UV Index: 0
Wind: 8 mph
8 PM
Cloudy Night
64°
Feels Like 63°
43
Humidity: 69%
UV Index: 0
Wind: 7 mph
9 PM
Stormy Weather
63°
Feels Like 57°
51
Humidity: 76%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
63°
Feels Like 61°
47
Humidity: 80%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
61°
Feels Like 59°
34
Humidity: 84%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.5 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.2 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.5 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.5 µg/m³
  • O3: 0.027 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.5 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.5 µg/m³
  • O3: 0.028 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.52 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.53 µg/m³
  • PM10: 0.55 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.57 µg/m³
  • PM10: 0.6 µg/m³
  • O3: 0.029 ppm
  • NO2: 0.1 ppb
  • SO2: 0 ppb
  • CO: 0.08 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: 0.61 µg/m³
  • PM10: 0.64 µg/m³
  • O3: 0.027 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.

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

Pollutant Concentrations:

  • PM2.5: 0.64 µg/m³
  • PM10: 0.68 µg/m³
  • O3: 0.023 ppm
  • NO2: 1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.67 µg/m³
  • PM10: 0.71 µg/m³
  • O3: 0.020 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.66 µg/m³
  • PM10: 0.7 µg/m³
  • O3: 0.018 ppm
  • NO2: 1.5 ppb
  • SO2: 0 ppb
  • CO: 0.10 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: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.65 µg/m³
  • PM10: 0.69 µg/m³
  • O3: 0.016 ppm
  • NO2: 1.6 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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