Today | Weather | Saturday, May 16, 2026

Weather in Sunnyvale, California

08:11 AM
Now
Sunny Weather
52° F
Feels Like 52°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 2
Humidity 88 %
Today
Sunny Weather
Day 72°
Night 48°
Precipitation 1 %
Wind 12 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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.

Sunnyvale Weather Forecast Updated

29 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 16, 2025)
Cloudy Weather

Day

75°

Night

54°

Wind

8 mph

UV Index

10

Precipitation

0 %

Air Quality in Sunnyvale

NOW
47 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.33 µg/m³
PM10 16.44 µg/m³
O3 0.051 ppm
NO2 0.2 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0.01 µg/m³
NO 0.02 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)
PM2.53.33 µg/m³
PM1016.44 µg/m³
O3100.42 µg/m³
NO20.41 µg/m³
SO20.57 µg/m³
CO127.38 µg/m³
NH30.01 µg/m³
NO0.02 µg/m³