Hourly Weather | Today Wednesday, May 20, 2026
Westminster, Colorado
4 PM
Rainy Weather
57°
Feels Like 57°
47
Humidity: 58%
UV Index: 2
Wind: 6 mph
5 PM
Cloudy Weather
59°
Feels Like 61°
45
Humidity: 55%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
57°
Feels Like 59°
47
Humidity: 58%
UV Index: 1
Wind: 7 mph
7 PM
Partly Sunny with Showers
55°
Feels Like 52°
51
Humidity: 63%
UV Index: 1
Wind: 6 mph
8 PM
Cloudy Weather
54°
Feels Like 52°
25
Humidity: 66%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
52°
Feels Like 48°
20
Humidity: 72%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
48°
Feels Like 46°
20
Humidity: 79%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
46°
Feels Like 45°
20
Humidity: 87%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.91 µg/m³
  • PM10: 1.55 µg/m³
  • O3: 0.043 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
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.98 µg/m³
  • PM10: 1.77 µg/m³
  • O3: 0.045 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
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.04 µg/m³
  • PM10: 1.97 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 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
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.06 µg/m³
  • PM10: 1.92 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.1 µg/m³
  • PM10: 1.84 µg/m³
  • O3: 0.041 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
36 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.16 µg/m³
  • PM10: 1.83 µg/m³
  • O3: 0.039 ppm
  • NO2: 1.3 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.2 µg/m³
  • PM10: 1.83 µg/m³
  • O3: 0.036 ppm
  • NO2: 1.5 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.26 µg/m³
  • PM10: 1.83 µg/m³
  • O3: 0.034 ppm
  • NO2: 1.7 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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