Today | Weather | Tuesday, December 30, 2025

Weather in San Francisco, California

04:02 PM
Now
Cloudy Weather
50° F
Feels Like 45°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 1
Humidity 84 %
Today
Cloudy Weather
Day 52°
Night 46°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 2

San Francisco Weather Forecast Updated

7 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 30, 2024)
Cloudy Weather

Day

57°

Night

45°

Wind

6 mph

UV Index

2

Precipitation

1 %

Air Quality in San Francisco

NOW
42 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 10.03 µg/m³
PM10 14.61 µg/m³
O3 0.031 ppm
NO2 9.6 ppb
SO2 0.6 ppb
CO 0.21 ppm
NH3 0.34 µg/m³
NO 0.33 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)
PM2.510.03 µg/m³
PM1014.61 µg/m³
O361.01 µg/m³
NO218.01 µg/m³
SO21.54 µg/m³
CO236.37 µg/m³
NH30.34 µg/m³
NO0.33 µg/m³