Today | Weather | Tuesday, April 21, 2026

Weather in Hayward, California

05:22 PM
Now
Sunny with a Chance of Thunderstorms
57° F
Feels Like 54°
Precipitation 42 %
Wind 13 mph
UV Index (0 - 11+) 1
Humidity 79 %
Today
Sunny with a Chance of Thunderstorms
Day 61°
Night 52°
Precipitation 97 %
Wind 10 mph
UV Index (0 - 11+) 2

Hayward Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 21, 2025)
Sunny Weather

Day

77°

Night

50°

Wind

7 mph

UV Index

9

Precipitation

1 %

Air Quality in Hayward

NOW
49 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.52 µg/m³
PM10 1.48 µg/m³
O3 0.053 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.12 ppm
NH3 0 µg/m³
NO 0.04 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)
PM2.50.52 µg/m³
PM101.48 µg/m³
O3103.19 µg/m³
NO20.24 µg/m³
SO20.38 µg/m³
CO142.38 µg/m³
NH30 µg/m³
NO0.04 µg/m³