Today | Weather | Tuesday, December 9, 2025

Weather in Sunnyvale, California

05:19 PM
Now
Cloudy Night
54° F
Feels Like 54°
Precipitation 0 %
Wind 5 mph
Humidity 81 %
Today
Cloudy Weather
Day 55°
Night 43°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 2

Sunnyvale Weather Forecast Updated

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

Day

64°

Night

37°

Wind

6 mph

Precipitation

0 %

Air Quality in Sunnyvale

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.27 µg/m³
PM10 9.3 µg/m³
O3 0.043 ppm
NO2 1.9 ppb
SO2 0.3 ppb
CO 0.10 ppm
NH3 0.08 µg/m³
NO 0.04 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)
PM2.53.27 µg/m³
PM109.3 µg/m³
O385.39 µg/m³
NO23.5 µg/m³
SO20.81 µg/m³
CO117.13 µg/m³
NH30.08 µg/m³
NO0.04 µg/m³