Today | Weather | Friday, September 18, 2026

Weather in Hayward, California

04:38 PM
Now
Cloudy Weather
75° F
Feels Like 73°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 2
Humidity 57 %
Today
Cloudy Weather
Day 79°
Night 57°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 6

Hayward Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Rainy Weather

Day

75°

Night

61°

Wind

5 mph

Precipitation

84 %

Air Quality in Hayward

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.38 µg/m³
PM10 16.8 µg/m³
O3 0.046 ppm
NO2 0.3 ppb
SO2 0.3 ppb
CO 0.14 ppm
NH3 0 µg/m³
NO 0.07 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)
PM2.56.38 µg/m³
PM1016.8 µg/m³
O390.9 µg/m³
NO20.48 µg/m³
SO20.78 µg/m³
CO157.1 µg/m³
NH30 µg/m³
NO0.07 µg/m³