Today | Weather | Thursday, December 4, 2025

Weather in Santa Clara, California

01:30 AM
Now
Cloudy Night
43° F
Feels Like 43°
Precipitation 0 %
Wind 4 mph
Humidity 75 %
Today
Cloudy Weather
Day 61°
Night 39°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 3

Santa Clara Weather Forecast Updated

33 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)
Cloudy Night

Day

68°

Night

45°

Wind

2 mph

Precipitation

0 %

Air Quality in Santa Clara

NOW
29 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 6.94 µg/m³
PM10 13.47 µg/m³
O3 0.027 ppm
NO2 6.4 ppb
SO2 0.6 ppb
CO 0.19 ppm
NH3 0.41 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:

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

Show raw pollutant concentrations (µg/m³)
PM2.56.94 µg/m³
PM1013.47 µg/m³
O352.97 µg/m³
NO212.05 µg/m³
SO21.58 µg/m³
CO213.7 µg/m³
NH30.41 µg/m³
NO0 µg/m³