Today | Weather | Wednesday, April 1, 2026

Weather in San Francisco, California

06:25 PM
Now
Cloudy Weather
59° F
Feels Like 52°
Precipitation 48 %
Wind 16 mph
UV Index (0 - 11+) 0
Humidity 78 %
Today
Rainy Weather
Day 61°
Night 48°
Precipitation 87 %
Wind 12 mph
UV Index (0 - 11+) 2

San Francisco Weather Forecast Updated

23 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 1, 2025)
Partly Sunny with Showers

Day

55°

Night

45°

Wind

20 mph

UV Index

5

Precipitation

91 %

Air Quality in San Francisco

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.28 µg/m³
PM10 5.33 µg/m³
O3 0.049 ppm
NO2 0.2 ppb
SO2 0.3 ppb
CO 0.10 ppm
NH3 0 µg/m³
NO 0.04 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)
PM2.52.28 µg/m³
PM105.33 µg/m³
O395.66 µg/m³
NO20.42 µg/m³
SO20.76 µg/m³
CO116.21 µg/m³
NH30 µg/m³
NO0.04 µg/m³