Today | Weather | Tuesday, December 9, 2025

Weather in San Jose, California

05:17 PM
Now
Cloudy Night
55° F
Feels Like 55°
Precipitation 0 %
Wind 5 mph
Humidity 66 %
Today
Cloudy Weather
Day 57°
Night 43°
Precipitation 25 %
Wind 4 mph
UV Index (0 - 11+) 2

San Jose Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 9, 2024)
Night

Day

70°

Night

36°

Wind

4 mph

Precipitation

0 %

Air Quality in San Jose

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.48 µg/m³
PM10 10.66 µg/m³
O3 0.042 ppm
NO2 3.3 ppb
SO2 0.4 ppb
CO 0.12 ppm
NH3 0.17 µg/m³
NO 0.08 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:

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

Show raw pollutant concentrations (µg/m³)
PM2.54.48 µg/m³
PM1010.66 µg/m³
O381.68 µg/m³
NO26.23 µg/m³
SO21.16 µg/m³
CO135.76 µg/m³
NH30.17 µg/m³
NO0.08 µg/m³