Today | Weather | Monday, September 14, 2026

Weather in Sunnyvale, California

12:39 AM
Now
Night
55° F
Feels Like 55°
Precipitation 0 %
Wind 4 mph
Humidity 85 %
Today
Sunny Weather
Day 84°
Night 54°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 6

Sunnyvale Weather Forecast Updated

9 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 14, 2025)
Cloudy Weather

Day

81°

Night

57°

Wind

8 mph

UV Index

60

Precipitation

1 %

Air Quality in Sunnyvale

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.84 µg/m³
PM10 17.72 µg/m³
O3 0.042 ppm
NO2 0.3 ppb
SO2 0.3 ppb
CO 0.16 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)
PM2.53.84 µg/m³
PM1017.72 µg/m³
O382.38 µg/m³
NO20.61 µg/m³
SO20.69 µg/m³
CO187.24 µg/m³
NH30 µg/m³
NO0 µg/m³