Today | Weather | Sunday, December 14, 2025

Weather in Hayward, California

05:10 AM
Now
Foggy Weather
41° F
Feels Like 37°
Precipitation 7 %
Wind 6 mph
Humidity 97 %
Today
Cloudy Weather
Day 57°
Night 39°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 2

Hayward Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 14, 2024)
Cloudy Night

Day

57°

Night

41°

Wind

4 mph

Precipitation

1 %

Air Quality in Hayward

NOW
44 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 10.52 µg/m³
PM10 16.74 µg/m³
O3 0.040 ppm
NO2 0.9 ppb
SO2 0.4 ppb
CO 0.12 ppm
NH3 0.07 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)
PM2.510.52 µg/m³
PM1016.74 µg/m³
O378.91 µg/m³
NO21.61 µg/m³
SO21.17 µg/m³
CO132.39 µg/m³
NH30.07 µg/m³
NO0 µg/m³