Today | Weather | Wednesday, May 20, 2026

Weather in Hayward, California

01:50 PM
Now
Cloudy Weather
82° F
Feels Like 88°
Precipitation 0 %
Wind 12 mph
UV Index (0 - 11+) 10
Humidity 28 %
Today
Sunny Weather
Day 82°
Night 54°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Hayward Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 20, 2025)
Sunny Weather

Day

75°

Night

50°

Wind

9 mph

UV Index

11

Precipitation

0 %

Air Quality in Hayward

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.36 µg/m³
PM10 15.84 µg/m³
O3 0.039 ppm
NO2 0.3 ppb
SO2 0.3 ppb
CO 0.10 ppm
NH3 0.03 µg/m³
NO 0.14 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)
PM2.55.36 µg/m³
PM1015.84 µg/m³
O376.78 µg/m³
NO20.48 µg/m³
SO20.91 µg/m³
CO108.89 µg/m³
NH30.03 µg/m³
NO0.14 µg/m³