Today | Weather | Sunday, April 5, 2026

Weather in San Jose, California

01:10 AM
Now
Night
63° F
Feels Like 63°
Precipitation 0 %
Wind 4 mph
Humidity 42 %
Today
Cloudy Weather
Day 84°
Night 54°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 7

San Jose Weather Forecast Updated

17 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 5, 2025)
Cloudy Weather

Day

75°

Night

46°

Wind

7 mph

UV Index

7

Precipitation

1 %

Air Quality in San Jose

NOW
111 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 29.86 µg/m³
PM10 35.31 µg/m³
O3 0.073 ppm
NO2 1 ppb
SO2 0.5 ppb
CO 0.20 ppm
NH3 0.08 µg/m³
NO 0 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)
PM2.529.86 µg/m³
PM1035.31 µg/m³
O3144.08 µg/m³
NO21.88 µg/m³
SO21.27 µg/m³
CO223.9 µg/m³
NH30.08 µg/m³
NO0 µg/m³