Today | Weather | Monday, August 24, 2026

Weather in Sunnyvale, California

04:22 PM
Now
Cloudy Weather
79° F
Feels Like 81°
Precipitation 0 %
Wind 12 mph
UV Index (0 - 11+) 4
Humidity 57 %
Today
Cloudy Weather
Day 81°
Night 61°
Precipitation 4 %
Wind 7 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.

Sunnyvale Weather Forecast Updated

25 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 24, 2025)
Cloudy Weather

Day

79°

Night

59°

Wind

8 mph

UV Index

80

Precipitation

0 %

Air Quality in Sunnyvale

NOW
31 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.23 µg/m³
PM10 15 µg/m³
O3 0.033 ppm
NO2 0.2 ppb
SO2 0.3 ppb
CO 0.07 ppm
NH3 0 µg/m³
NO 0.08 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)
PM2.55.23 µg/m³
PM1015 µg/m³
O365.43 µg/m³
NO20.46 µg/m³
SO20.75 µg/m³
CO84.88 µg/m³
NH30 µg/m³
NO0.08 µg/m³