Today | Weather | Sunday, April 26, 2026

Weather in San Francisco, California

04:17 PM
Now
Cloudy Weather
61° F
Feels Like 57°
Precipitation 13 %
Wind 14 mph
UV Index (0 - 11+) 2
Humidity 59 %
Today
Cloudy Weather
Day 61°
Night 52°
Precipitation 30 %
Wind 12 mph
UV Index (0 - 11+) 4

San Francisco Weather Forecast Updated

18 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 26, 2025)
Partly Sunny with Showers

Day

59°

Night

50°

Wind

11 mph

UV Index

5

Precipitation

60 %

Air Quality in San Francisco

NOW
79 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.68 µg/m³
PM10 7.07 µg/m³
O3 0.063 ppm
NO2 0.1 ppb
SO2 0.2 ppb
CO 0.12 ppm
NH3 0.02 µg/m³
NO 0.03 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)
PM2.52.68 µg/m³
PM107.07 µg/m³
O3124.38 µg/m³
NO20.21 µg/m³
SO20.52 µg/m³
CO133.57 µg/m³
NH30.02 µg/m³
NO0.03 µg/m³