Today | Weather | Sunday, September 13, 2026

Weather in Sunnyvale, California

11:19 PM
Now
Cloudy Night
63° F
Feels Like 63°
Precipitation 0 %
Wind 5 mph
Humidity 74 %
Today
Cloudy Night
Day 75°
Night 54°
Precipitation 0 %
Wind 5 mph

Sunnyvale Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (September 13, 2025)
Cloudy Night

Day

72°

Night

61°

Wind

6 mph

Precipitation

0 %

Air Quality in Sunnyvale

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.68 µg/m³
PM10 16.43 µg/m³
O3 0.042 ppm
NO2 0.3 ppb
SO2 0.3 ppb
CO 0.17 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)
PM2.53.68 µg/m³
PM1016.43 µg/m³
O382.36 µg/m³
NO20.57 µg/m³
SO20.66 µg/m³
CO189.12 µg/m³
NH30 µg/m³
NO0 µg/m³