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Today Hourly 7 days 30 days Air Quality
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Hourly Weather | Today › Friday, October 30, 2026
Active Weather Warnings
Boulder, Colorado
4 AM
Cloudy Night
43°
Feels Like 43°
0
Humidity: 79%
UV Index: 0
Wind: 5 mph
5 AM
Cloudy Night
43°
Feels Like 43°
0
Humidity: 72%
UV Index: 0
Wind: 4 mph
6 AM
Cloudy Night
43°
Feels Like 45°
0
Humidity: 68%
UV Index: 0
Wind: 2 mph
7 AM
Cloudy Night
43°
Feels Like 43°
0
Humidity: 70%
UV Index: 0
Wind: 4 mph
8 AM
Cloudy Weather
45°
Feels Like 45°
0
Humidity: 70%
UV Index: 0
Wind: 5 mph
9 AM
Cloudy Weather
46°
Feels Like 48°
0
Humidity: 62%
UV Index: 1
Wind: 5 mph
10 AM
Cloudy Weather
54°
Feels Like 55°
0
Humidity: 52%
UV Index: 2
Wind: 5 mph
11 AM
Cloudy Weather
57°
Feels Like 61°
0
Humidity: 47%
UV Index: 3
Wind: 6 mph
12 PM
Cloudy Weather
61°
Feels Like 64°
0
Humidity: 43%
UV Index: 3
Wind: 6 mph
1 PM
Cloudy Weather
63°
Feels Like 66°
0
Humidity: 39%
UV Index: 3
Wind: 6 mph
2 PM
Cloudy Weather
64°
Feels Like 68°
0
Humidity: 36%
UV Index: 3
Wind: 6 mph
3 PM
Cloudy Weather
64°
Feels Like 66°
0
Humidity: 33%
UV Index: 3
Wind: 6 mph
4 PM
Cloudy Weather
64°
Feels Like 66°
0
Humidity: 36%
UV Index: 2
Wind: 6 mph
5 PM
Cloudy Weather
61°
Feels Like 63°
0
Humidity: 40%
UV Index: 1
Wind: 6 mph
6 PM
Cloudy Weather
57°
Feels Like 57°
0
Humidity: 48%
UV Index: 0
Wind: 5 mph
7 PM
Cloudy Night
55°
Feels Like 54°
0
Humidity: 55%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
54°
Feels Like 52°
0
Humidity: 59%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
52°
Feels Like 48°
0
Humidity: 63%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
50°
Feels Like 48°
0
Humidity: 67%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
48°
Feels Like 46°
0
Humidity: 69%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 2.59 µg/m³
  • PM10: 3.66 µg/m³
  • O3: 0.029 ppm
  • NO2: 1.6 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.55 µg/m³
  • PM10: 3.58 µg/m³
  • O3: 0.029 ppm
  • NO2: 1.4 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.53 µg/m³
  • PM10: 3.53 µg/m³
  • O3: 0.029 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.

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

Pollutant Concentrations:

  • PM2.5: 2.54 µg/m³
  • PM10: 3.52 µg/m³
  • O3: 0.029 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.

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

Pollutant Concentrations:

  • PM2.5: 2.51 µg/m³
  • PM10: 3.48 µg/m³
  • O3: 0.029 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.

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

Pollutant Concentrations:

  • PM2.5: 2.39 µg/m³
  • PM10: 3.38 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.1 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

10 AM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.14 µg/m³
  • PM10: 3.14 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.2 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.15 µg/m³
  • PM10: 3.14 µg/m³
  • O3: 0.030 ppm
  • NO2: 1.9 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.28 µg/m³
  • PM10: 3.27 µg/m³
  • O3: 0.031 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.

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

Pollutant Concentrations:

  • PM2.5: 2.17 µg/m³
  • PM10: 3.1 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.1 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.74 µg/m³
  • PM10: 2.57 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.9 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
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.6 µg/m³
  • PM10: 2.39 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.7 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
36 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.62 µg/m³
  • PM10: 2.38 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.7 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
34 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.73 µg/m³
  • PM10: 2.48 µg/m³
  • O3: 0.037 ppm
  • NO2: 1.1 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
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.86 µg/m³
  • PM10: 2.64 µg/m³
  • O3: 0.035 ppm
  • NO2: 1.8 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.08 µg/m³
  • PM10: 2.88 µg/m³
  • O3: 0.034 ppm
  • NO2: 2.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.26 µg/m³
  • PM10: 3.09 µg/m³
  • O3: 0.033 ppm
  • NO2: 2.7 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
30 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.19 µg/m³
  • PM10: 3.04 µg/m³
  • O3: 0.032 ppm
  • NO2: 2.6 ppb
  • SO2: 0.1 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.16 µg/m³
  • PM10: 2.99 µg/m³
  • O3: 0.031 ppm
  • NO2: 2.3 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
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.2 µg/m³
  • PM10: 3.06 µg/m³
  • O3: 0.030 ppm
  • NO2: 2.2 ppb
  • SO2: 0 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Boulder

Moderate Expected Likely

Dense Fog Advisory

Dense Fog Advisory issued October 29 at 10:17PM MDT until October 30 at 10:00AM MDT by NWS Denver CO
Oct 30, 3:00 AM → Oct 30, 10:00 AM
WHAT: Visibility less than one quarter mile in dense fog.

WHERE: Boulder and the western suburbs of Denver, and Denver.

WHEN: From 3 AM to 10 AM MDT Friday.

IMPACTS: Low visibility could make driving conditions hazardous.
+ Read More
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Updated: Oct 30, 3:00 AM Source: NWS Alert

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