Hourly Weather | Today Tuesday, June 30, 2026
Active Weather Warnings
Boulder, Colorado
3 AM
Night
63°
Feels Like 61°
0
Humidity: 28%
UV Index: 0
Wind: 7 mph
4 AM
Night
61°
Feels Like 57°
0
Humidity: 27%
UV Index: 0
Wind: 7 mph
5 AM
Night
57°
Feels Like 55°
0
Humidity: 28%
UV Index: 0
Wind: 7 mph
6 AM
Cloudy Weather
57°
Feels Like 55°
0
Humidity: 31%
UV Index: 0
Wind: 7 mph
7 AM
Cloudy Weather
61°
Feels Like 61°
0
Humidity: 29%
UV Index: 1
Wind: 7 mph
8 AM
Cloudy Weather
64°
Feels Like 66°
0
Humidity: 27%
UV Index: 2
Wind: 7 mph
9 AM
Cloudy Weather
72°
Feels Like 73°
0
Humidity: 24%
UV Index: 4
Wind: 7 mph
10 AM
Cloudy Weather
73°
Feels Like 79°
0
Humidity: 23%
UV Index: 5
Wind: 7 mph
11 AM
Cloudy Weather
77°
Feels Like 82°
0
Humidity: 21%
UV Index: 8
Wind: 8 mph
12 PM
Cloudy Weather
79°
Feels Like 86°
0
Humidity: 20%
UV Index: 10
Wind: 9 mph
1 PM
Cloudy Weather
82°
Feels Like 88°
2
Humidity: 19%
UV Index: 10
Wind: 9 mph
2 PM
Stormy Weather
82°
Feels Like 81°
51
Humidity: 22%
UV Index: 4
Wind: 9 mph
3 PM
Cloudy Weather
84°
Feels Like 90°
47
Humidity: 19%
UV Index: 7
Wind: 9 mph
4 PM
Cloudy Weather
84°
Feels Like 86°
34
Humidity: 20%
UV Index: 5
Wind: 9 mph
5 PM
Cloudy Weather
84°
Feels Like 84°
15
Humidity: 20%
UV Index: 3
Wind: 9 mph
6 PM
Cloudy Weather
81°
Feels Like 81°
15
Humidity: 22%
UV Index: 2
Wind: 9 mph
7 PM
Cloudy Weather
81°
Feels Like 79°
19
Humidity: 23%
UV Index: 1
Wind: 9 mph
8 PM
Cloudy Weather
79°
Feels Like 75°
43
Humidity: 24%
UV Index: 0
Wind: 10 mph
9 PM
Cloudy Night
73°
Feels Like 72°
47
Humidity: 26%
UV Index: 0
Wind: 10 mph
10 PM
Stormy Weather
72°
Feels Like 64°
51
Humidity: 38%
UV Index: 0
Wind: 9 mph
11 PM
Cloudy Night
68°
Feels Like 64°
39
Humidity: 42%
UV Index: 0
Wind: 8 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
152 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 60.06 µg/m³
  • PM10: 61.79 µg/m³
  • O3: 0.065 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.26 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

4 AM
154 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 62.96 µg/m³
  • PM10: 64.71 µg/m³
  • O3: 0.062 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.26 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

5 AM
156 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 67.44 µg/m³
  • PM10: 69.22 µg/m³
  • O3: 0.061 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.27 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

6 AM
159 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 72.72 µg/m³
  • PM10: 74.55 µg/m³
  • O3: 0.059 ppm
  • NO2: 1 ppb
  • SO2: 0.1 ppb
  • CO: 0.27 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

7 AM
160 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 75.31 µg/m³
  • PM10: 77.17 µg/m³
  • O3: 0.056 ppm
  • NO2: 1.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.28 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

8 AM
160 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 75.25 µg/m³
  • PM10: 77.19 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.28 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

9 AM
159 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 71.71 µg/m³
  • PM10: 73.86 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.26 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

10 AM
68 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.23 µg/m³
  • PM10: 23.27 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.84 µg/m³
  • PM10: 10.26 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.91 µg/m³
  • PM10: 8.03 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.92 µg/m³
  • PM10: 6.76 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.1 ppb
  • SO2: 0.2 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 5.31 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.8 µg/m³
  • PM10: 4.23 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.48 µg/m³
  • PM10: 3.79 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.06 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.57 µg/m³
  • PM10: 3.72 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.29 µg/m³
  • PM10: 4.23 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.07 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.44 µg/m³
  • PM10: 6.25 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.08 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.02 µg/m³
  • PM10: 10.75 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

9 PM
64 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 18.54 µg/m³
  • PM10: 19.25 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

10 PM
78 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 25.07 µg/m³
  • PM10: 25.74 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.7 ppb
  • SO2: 0.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

11 PM
88 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 29.97 µg/m³
  • PM10: 30.63 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.9 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Boulder

Air Quality Alert

Air Quality Alert issued June 29 at 9:10AM MDT by NWS Denver CO
Jun 29, 9:10 AM Jun 30, 9:00 AM
The Colorado Department of Public Health and Environment has
issued the following...

WHAT...Action Day for Multiple Pollutants.

WHERE...Douglas, Jefferson, Denver, western Arapahoe, western
Adams, Broomfield, Boulder, Larimer, and Weld Counties

WHEN...400 PM Sunday June 28 to 400 PM Monday June 29

IMPACTS...Action Day for Multiple Pollutants is now in effect for
the Front Range Urban Corridor. Increasing wildfire smoke is
possible Sunday afternoon and evening, especially in and near
Denver and the local foothills to the west of the metro area.
Another plume of wildfire smoke could impact the entire northern
Front Range region Monday afternoon and evening. Both ozone and
fine particulates could reach the Unhealthy for Sensitive Groups
category or higher. For Colorado air quality conditions,
forecasts, and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx If
possible, please help us reduce ozone pollution by limiting
driving gas and diesel-powered vehicles until at least 4 p.m.
Monday, June 29, 2026. Colorado is also addressing ozone pollution
through state policies. For more information about health impacts
and how ozone pollution forms in Colorado, visit:
https://cdphe.colorado.gov/ozone- pollution-and-your-health

HEALTH INFORMATION...People with heart or lung disease, older
adults, and children should reduce prolonged or heavy exertion.
During periods of heavier wildfire smoke, everyone should reduce
prolonged or heavy exertion.
Updated: Jun 30, 1:43 AM Source: NWS Alert