Today | Weather | Sunday, January 18, 2026

Weather in Sunnyvale, California

10:46 PM
Now
Cloudy Night
50° F
Feels Like 48°
Precipitation 0 %
Wind 6 mph
Humidity 79 %
Today
Cloudy Night
Day 70°
Night 43°
Precipitation 0 %
Wind 5 mph

Sunnyvale Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (January 18, 2025)
Cloudy Weather

Day

61°

Night

37°

Wind

4 mph

UV Index

3

Precipitation

0 %

Air Quality in Sunnyvale

NOW
82 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 27.08 µg/m³
PM10 35.74 µg/m³
O3 0.033 ppm
NO2 5.3 ppb
SO2 0.6 ppb
CO 0.25 ppm
NH3 0.19 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.527.08 µg/m³
PM1035.74 µg/m³
O365.43 µg/m³
NO29.93 µg/m³
SO21.46 µg/m³
CO280.71 µg/m³
NH30.19 µg/m³
NO0 µg/m³