Today | Weather | Thursday, February 5, 2026

Weather in San Leandro, California

05:34 PM
Now
Cloudy Night
64° F
Feels Like 63°
Precipitation 0 %
Wind 7 mph
Humidity 62 %
Today
Cloudy Weather
Day 72°
Night 50°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 3

San Leandro Weather Forecast Updated

40 minutes ago
Last updated on

Air Quality in San Leandro

NOW
135 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 49.27 µg/m³
PM10 53.05 µg/m³
O3 0.053 ppm
NO2 2.2 ppb
SO2 0.4 ppb
CO 0.30 ppm
NH3 0.62 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:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)
PM2.549.27 µg/m³
PM1053.05 µg/m³
O3104.47 µg/m³
NO24.21 µg/m³
SO21.15 µg/m³
CO340.94 µg/m³
NH30.62 µg/m³
NO0 µg/m³