Today | Weather | Sunday, April 19, 2026

Weather in Santa Clara, California

01:45 AM
Now
Cloudy Night
55° F
Feels Like 55°
Precipitation 0 %
Wind 4 mph
Humidity 73 %
Today
Cloudy Weather
Day 75°
Night 52°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Santa Clara Weather Forecast Updated

47 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 19, 2025)
Cloudy Weather

Day

73°

Night

50°

Wind

7 mph

UV Index

8

Precipitation

0 %

Air Quality in Santa Clara

NOW
49 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.39 µg/m³
PM10 9.22 µg/m³
O3 0.053 ppm
NO2 0.6 ppb
SO2 0.4 ppb
CO 0.13 ppm
NH3 0 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)
PM2.53.39 µg/m³
PM109.22 µg/m³
O3103.59 µg/m³
NO21.06 µg/m³
SO21.11 µg/m³
CO145.19 µg/m³
NH30 µg/m³
NO0 µg/m³