Hourly Weather | Today Thursday, December 4, 2025
Santa Clara, California
3 AM
Cloudy Night
39°
Feels Like 39°
0
Humidity: 79%
Wind: 5 mph
UV Index: 0
4 AM
Cloudy Night
39°
Feels Like 39°
0
Humidity: 81%
Wind: 4 mph
UV Index: 0
5 AM
Cloudy Night
37°
Feels Like 37°
0
Humidity: 84%
Wind: 4 mph
UV Index: 0
6 AM
Cloudy Night
37°
Feels Like 37°
0
Humidity: 87%
Wind: 4 mph
UV Index: 0
7 AM
Cloudy Night
39°
Feels Like 41°
0
Humidity: 78%
Wind: 4 mph
UV Index: 0
8 AM
Cloudy Weather
41°
Feels Like 43°
0
Humidity: 78%
Wind: 4 mph
UV Index: 1
9 AM
Cloudy Weather
46°
Feels Like 52°
0
Humidity: 66%
Wind: 4 mph
UV Index: 1
10 AM
Cloudy Weather
52°
Feels Like 55°
0
Humidity: 61%
Wind: 4 mph
UV Index: 2
11 AM
Cloudy Weather
55°
Feels Like 61°
0
Humidity: 56%
Wind: 5 mph
UV Index: 2
12 PM
Cloudy Weather
57°
Feels Like 63°
0
Humidity: 51%
Wind: 5 mph
UV Index: 3
1 PM
Cloudy Weather
57°
Feels Like 63°
0
Humidity: 49%
Wind: 5 mph
UV Index: 2
2 PM
Cloudy Weather
61°
Feels Like 63°
0
Humidity: 49%
Wind: 6 mph
UV Index: 2
3 PM
Cloudy Weather
61°
Feels Like 63°
0
Humidity: 49%
Wind: 6 mph
UV Index: 1
4 PM
Cloudy Weather
57°
Feels Like 59°
0
Humidity: 56%
Wind: 6 mph
UV Index: 1
5 PM
Cloudy Night
55°
Feels Like 55°
0
Humidity: 63%
Wind: 5 mph
UV Index: 0
6 PM
Cloudy Night
54°
Feels Like 52°
0
Humidity: 69%
Wind: 5 mph
UV Index: 0
7 PM
Cloudy Night
50°
Feels Like 50°
0
Humidity: 75%
Wind: 4 mph
UV Index: 0
8 PM
Cloudy Night
46°
Feels Like 48°
0
Humidity: 81%
Wind: 4 mph
UV Index: 0
9 PM
Cloudy Night
46°
Feels Like 46°
0
Humidity: 84%
Wind: 2 mph
UV Index: 0
10 PM
Cloudy Night
45°
Feels Like 46°
0
Humidity: 85%
Wind: 2 mph
UV Index: 0
11 PM
Cloudy Night
45°
Feels Like 46°
0
Humidity: 86%
Wind: 2 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
39 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.32 µg/m³
  • PM10: 16.57 µg/m³
  • O3: 0.024 ppm
  • NO2: 7.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

4 AM
44 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.6 µg/m³
  • PM10: 18.12 µg/m³
  • O3: 0.023 ppm
  • NO2: 7.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

5 AM
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.71 µg/m³
  • PM10: 19.45 µg/m³
  • O3: 0.022 ppm
  • NO2: 7.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

6 AM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.44 µg/m³
  • PM10: 20.36 µg/m³
  • O3: 0.022 ppm
  • NO2: 7.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

7 AM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.76 µg/m³
  • PM10: 20.74 µg/m³
  • O3: 0.022 ppm
  • NO2: 6.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

8 AM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.02 µg/m³
  • PM10: 20.87 µg/m³
  • O3: 0.022 ppm
  • NO2: 6.9 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

9 AM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.95 µg/m³
  • PM10: 20.62 µg/m³
  • O3: 0.024 ppm
  • NO2: 6.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 12.45 µg/m³
  • PM10: 19.91 µg/m³
  • O3: 0.026 ppm
  • NO2: 5.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

11 AM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.13 µg/m³
  • PM10: 19.43 µg/m³
  • O3: 0.029 ppm
  • NO2: 5.2 ppb
  • SO2: 0.8 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

12 PM
51 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.64 µg/m³
  • PM10: 19.83 µg/m³
  • O3: 0.033 ppm
  • NO2: 4.9 ppb
  • SO2: 0.8 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

1 PM
54 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.87 µg/m³
  • PM10: 20.92 µg/m³
  • O3: 0.037 ppm
  • NO2: 4.8 ppb
  • SO2: 0.9 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

2 PM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.73 µg/m³
  • PM10: 21.67 µg/m³
  • O3: 0.040 ppm
  • NO2: 4.8 ppb
  • SO2: 0.9 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

3 PM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.61 µg/m³
  • PM10: 21.58 µg/m³
  • O3: 0.042 ppm
  • NO2: 5.2 ppb
  • SO2: 1 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

4 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.33 µg/m³
  • PM10: 21.45 µg/m³
  • O3: 0.042 ppm
  • NO2: 6.2 ppb
  • SO2: 1.1 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.06 µg/m³
  • PM10: 21.25 µg/m³
  • O3: 0.041 ppm
  • NO2: 7.6 ppb
  • SO2: 1.1 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

6 PM
54 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.03 µg/m³
  • PM10: 21.71 µg/m³
  • O3: 0.038 ppm
  • NO2: 8 ppb
  • SO2: 1.2 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

7 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.12 µg/m³
  • PM10: 22.36 µg/m³
  • O3: 0.036 ppm
  • NO2: 8 ppb
  • SO2: 1.2 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

8 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.2 µg/m³
  • PM10: 22.87 µg/m³
  • O3: 0.034 ppm
  • NO2: 7.9 ppb
  • SO2: 1.2 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.45 µg/m³
  • PM10: 23.68 µg/m³
  • O3: 0.032 ppm
  • NO2: 8.1 ppb
  • SO2: 1.1 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.66 µg/m³
  • PM10: 24.35 µg/m³
  • O3: 0.030 ppm
  • NO2: 8.1 ppb
  • SO2: 1.1 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.24 µg/m³
  • PM10: 24.08 µg/m³
  • O3: 0.029 ppm
  • NO2: 7.5 ppb
  • SO2: 1.1 ppb
  • CO: 0.22 ppm

Health Recommendations:

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