Today | Weather | Monday, January 19, 2026

Weather in San Francisco, California

01:39 AM
Now
Cloudy Night
50° F
Feels Like 46°
Precipitation 0 %
Wind 7 mph
Humidity 87 %
Today
Cloudy Weather
Day 63°
Night 46°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 3

San Francisco Weather Forecast Updated

44 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 19, 2025)
Cloudy Weather

Day

55°

Night

41°

Wind

4 mph

UV Index

3

Precipitation

0 %

Air Quality in San Francisco

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

Pollutant Concentrations:

PM2.5 9.98 µg/m³
PM10 16.8 µg/m³
O3 0.033 ppm
NO2 1.9 ppb
SO2 0.4 ppb
CO 0.15 ppm
NH3 0.06 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.59.98 µg/m³
PM1016.8 µg/m³
O363.84 µg/m³
NO23.55 µg/m³
SO21 µg/m³
CO175.09 µg/m³
NH30.06 µg/m³
NO0 µg/m³