Hourly Weather | Today Monday, April 27, 2026
Boulder, Colorado
4 PM
Rainy Weather
48°
Feels Like 45°
44
Humidity: 77%
UV Index: 1
Wind: 9 mph
5 PM
Cloudy Weather
48°
Feels Like 45°
38
Humidity: 76%
UV Index: 1
Wind: 9 mph
6 PM
Cloudy Weather
48°
Feels Like 45°
33
Humidity: 71%
UV Index: 1
Wind: 9 mph
7 PM
Cloudy Weather
46°
Feels Like 43°
39
Humidity: 72%
UV Index: 0
Wind: 9 mph
8 PM
Rainy Weather
46°
Feels Like 39°
66
Humidity: 75%
UV Index: 0
Wind: 7 mph
9 PM
Rainy Weather
45°
Feels Like 37°
66
Humidity: 81%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Weather
43°
Feels Like 39°
49
Humidity: 85%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Weather
41°
Feels Like 37°
34
Humidity: 90%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.54 µg/m³
  • O3: 0.039 ppm
  • NO2: 0 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
37 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.56 µg/m³
  • O3: 0.040 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
37 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.59 µg/m³
  • O3: 0.040 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
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.62 µg/m³
  • O3: 0.038 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
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.5 µg/m³
  • PM10: 0.66 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.7 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
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.53 µg/m³
  • PM10: 0.72 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.9 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
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.55 µg/m³
  • PM10: 0.76 µg/m³
  • O3: 0.033 ppm
  • NO2: 1.1 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
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.59 µg/m³
  • PM10: 0.82 µg/m³
  • O3: 0.032 ppm
  • NO2: 1.2 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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