Today | Weather | Monday, May 25, 2026

Weather in Hayward, California

12:48 AM
Now
Cloudy Night
55° F
Feels Like 52°
Precipitation 0 %
Wind 8 mph
Humidity 81 %
Today
Cloudy Weather
Day 66°
Night 54°
Precipitation 1 %
Wind 13 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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.

Hayward Weather Forecast Updated

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

Day

66°

Night

55°

Wind

14 mph

UV Index

11

Precipitation

25 %

Air Quality in Hayward

NOW
38 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.76 µg/m³
PM10 4.87 µg/m³
O3 0.041 ppm
NO2 0.3 ppb
SO2 0.2 ppb
CO 0.10 ppm
NH3 0 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)
PM2.51.76 µg/m³
PM104.87 µg/m³
O380.71 µg/m³
NO20.57 µg/m³
SO20.5 µg/m³
CO111.42 µg/m³
NH30 µg/m³
NO0 µg/m³