Today | Weather | Monday, April 27, 2026

Weather in San Leandro, California

01:37 PM
Now
Cloudy Weather
63° F
Feels Like 70°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 8
Humidity 57 %
Today
Cloudy Weather
Day 64°
Night 50°
Precipitation 13 %
Wind 9 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

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.

San Leandro Weather Forecast Updated

Last updated on

Air Quality in San Leandro

NOW
57 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2 µg/m³
PM10 5.49 µg/m³
O3 0.056 ppm
NO2 0.2 ppb
SO2 0.3 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0.05 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.52 µg/m³
PM105.49 µg/m³
O3110.18 µg/m³
NO20.29 µg/m³
SO20.72 µg/m³
CO130.21 µg/m³
NH30 µg/m³
NO0.05 µg/m³