Today | Weather | Wednesday, January 7, 2026

Weather in San Leandro, California

11:45 PM
Now
Cloudy Night
45° F
Feels Like 41°
Precipitation 0 %
Wind 7 mph
Humidity 61 %
Today
Cloudy Weather
Day 57°
Night 41°
Precipitation 2 %
Wind 9 mph
UV Index (0 - 11+) 3

San Leandro Weather Forecast Updated

9 minutes ago
Last updated on

Air Quality in San Leandro

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.05 µg/m³
PM10 6.12 µg/m³
O3 0.046 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.11 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)
PM2.52.05 µg/m³
PM106.12 µg/m³
O391.25 µg/m³
NO20.33 µg/m³
SO20.18 µg/m³
CO129.85 µg/m³
NH30 µg/m³
NO0 µg/m³