Today | Weather | Monday, May 25, 2026

Weather in Hayward, California

12:47 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

9 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