Today | Weather | Sunday, April 12, 2026

Weather in San Francisco, California

05:17 AM
Now
Rainy Weather
54° F
Feels Like 43°
Precipitation 40 %
Wind 17 mph
Humidity 82 %
Today
Sunny with a Chance of Thunderstorms
Day 61°
Night 48°
Precipitation 88 %
Wind 17 mph
UV Index (0 - 11+) 4

San Francisco Weather Forecast Updated

39 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 12, 2025)
Sunny Weather

Day

64°

Night

48°

Wind

12 mph

UV Index

8

Precipitation

1 %

Air Quality in San Francisco

NOW
64 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.03 µg/m³
PM10 4.29 µg/m³
O3 0.058 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.12 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 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)
PM2.51.03 µg/m³
PM104.29 µg/m³
O3114.53 µg/m³
NO20.27 µg/m³
SO20.36 µg/m³
CO134.17 µg/m³
NH30 µg/m³
NO0 µg/m³