Today | Weather | Wednesday, May 20, 2026

Weather in Santa Clara, California

10:05 PM
Now
Cloudy Night
64° F
Feels Like 63°
Precipitation 0 %
Wind 6 mph
Humidity 55 %
Today
Cloudy Night
Day 86°
Night 55°
Precipitation 0 %
Wind 5 mph

Santa Clara Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 20, 2025)
Sunny Weather

Day

79°

Night

50°

Wind

9 mph

UV Index

11

Precipitation

0 %

Air Quality in Santa Clara

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.82 µg/m³
PM10 17.97 µg/m³
O3 0.043 ppm
NO2 0.7 ppb
SO2 0.4 ppb
CO 0.10 ppm
NH3 0.02 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)
PM2.55.82 µg/m³
PM1017.97 µg/m³
O383.78 µg/m³
NO21.23 µg/m³
SO20.95 µg/m³
CO114.85 µg/m³
NH30.02 µg/m³
NO0 µg/m³