Hourly Weather | Today Monday, January 19, 2026
San Jose, California
6 AM
Cloudy Night
43°
Feels Like 43°
0
Humidity: 88%
Wind: 4 mph
UV Index: 0
7 AM
Cloudy Night
45°
Feels Like 46°
0
Humidity: 78%
Wind: 4 mph
UV Index: 0
8 AM
Cloudy Weather
45°
Feels Like 46°
0
Humidity: 80%
Wind: 4 mph
UV Index: 1
9 AM
Cloudy Weather
48°
Feels Like 54°
0
Humidity: 74%
Wind: 4 mph
UV Index: 2
10 AM
Cloudy Weather
54°
Feels Like 59°
0
Humidity: 66%
Wind: 4 mph
UV Index: 2
11 AM
Cloudy Weather
57°
Feels Like 64°
0
Humidity: 57%
Wind: 5 mph
UV Index: 3
12 PM
Cloudy Weather
63°
Feels Like 66°
0
Humidity: 50%
Wind: 6 mph
UV Index: 3
1 PM
Cloudy Weather
64°
Feels Like 68°
0
Humidity: 45%
Wind: 6 mph
UV Index: 3
2 PM
Cloudy Weather
66°
Feels Like 68°
0
Humidity: 42%
Wind: 6 mph
UV Index: 2
3 PM
Cloudy Weather
68°
Feels Like 68°
0
Humidity: 41%
Wind: 6 mph
UV Index: 2
4 PM
Cloudy Weather
66°
Feels Like 64°
0
Humidity: 43%
Wind: 7 mph
UV Index: 1
5 PM
Cloudy Weather
64°
Feels Like 63°
0
Humidity: 47%
Wind: 6 mph
UV Index: 0
6 PM
Cloudy Night
61°
Feels Like 61°
0
Humidity: 52%
Wind: 6 mph
UV Index: 0
7 PM
Cloudy Night
57°
Feels Like 57°
0
Humidity: 57%
Wind: 5 mph
UV Index: 0
8 PM
Night
55°
Feels Like 55°
0
Humidity: 62%
Wind: 5 mph
UV Index: 0
9 PM
Night
54°
Feels Like 54°
0
Humidity: 66%
Wind: 5 mph
UV Index: 0
10 PM
Night
52°
Feels Like 52°
0
Humidity: 70%
Wind: 4 mph
UV Index: 0
11 PM
Cloudy Night
50°
Feels Like 50°
0
Humidity: 73%
Wind: 4 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 29.51 µg/m³
  • PM10: 39.86 µg/m³
  • O3: 0.019 ppm
  • NO2: 10.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.29 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 27.48 µg/m³
  • PM10: 37.74 µg/m³
  • O3: 0.019 ppm
  • NO2: 10.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.28 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 25.42 µg/m³
  • PM10: 35.68 µg/m³
  • O3: 0.019 ppm
  • NO2: 9.7 ppb
  • SO2: 0.6 ppb
  • CO: 0.27 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 23.46 µg/m³
  • PM10: 33.56 µg/m³
  • O3: 0.021 ppm
  • NO2: 8.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 21.81 µg/m³
  • PM10: 31.6 µg/m³
  • O3: 0.024 ppm
  • NO2: 6.6 ppb
  • SO2: 0.6 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

11 AM
69 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.88 µg/m³
  • PM10: 30.46 µg/m³
  • O3: 0.027 ppm
  • NO2: 5.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 21.31 µg/m³
  • PM10: 30.86 µg/m³
  • O3: 0.031 ppm
  • NO2: 5.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 22.78 µg/m³
  • PM10: 32.33 µg/m³
  • O3: 0.035 ppm
  • NO2: 5.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 23.72 µg/m³
  • PM10: 33.22 µg/m³
  • O3: 0.038 ppm
  • NO2: 5.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 23.75 µg/m³
  • PM10: 33.13 µg/m³
  • O3: 0.040 ppm
  • NO2: 5.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.24 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 22.96 µg/m³
  • PM10: 32.09 µg/m³
  • O3: 0.041 ppm
  • NO2: 5.9 ppb
  • SO2: 0.7 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.

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

Pollutant Concentrations:

  • PM2.5: 21.53 µg/m³
  • PM10: 30.27 µg/m³
  • O3: 0.041 ppm
  • NO2: 6.6 ppb
  • SO2: 0.7 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.

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

Pollutant Concentrations:

  • PM2.5: 19.76 µg/m³
  • PM10: 28.24 µg/m³
  • O3: 0.039 ppm
  • NO2: 6.6 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 PM
63 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.93 µg/m³
  • PM10: 26.54 µg/m³
  • O3: 0.039 ppm
  • NO2: 5.7 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 PM
60 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 16.75 µg/m³
  • PM10: 25.77 µg/m³
  • O3: 0.038 ppm
  • NO2: 5.4 ppb
  • SO2: 0.7 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.

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

Pollutant Concentrations:

  • PM2.5: 16.29 µg/m³
  • PM10: 25.7 µg/m³
  • O3: 0.036 ppm
  • NO2: 5.6 ppb
  • SO2: 0.6 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.

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

Pollutant Concentrations:

  • PM2.5: 16.54 µg/m³
  • PM10: 26.21 µg/m³
  • O3: 0.034 ppm
  • NO2: 6.2 ppb
  • SO2: 0.6 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 PM
61 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.31 µg/m³
  • PM10: 27.11 µg/m³
  • O3: 0.032 ppm
  • NO2: 7.1 ppb
  • SO2: 0.6 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.