Today | Weather | Monday, May 25, 2026

Weather in San Francisco, California

11:12 AM
Now
Cloudy Weather
57° F
Feels Like 55°
Precipitation 7 %
Wind 10 mph
UV Index (0 - 11+) 2
Humidity 76 %
Today
Cloudy Weather
Day 63°
Night 52°
Precipitation 25 %
Wind 14 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

San Francisco Weather Forecast Updated

58 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 25, 2025)
Cloudy Weather

Day

63°

Night

54°

Wind

16 mph

UV Index

11

Precipitation

0 %

Air Quality in San Francisco

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.33 µg/m³
PM10 8.29 µg/m³
O3 0.047 ppm
NO2 0.3 ppb
SO2 0.2 ppb
CO 0.10 ppm
NH3 0 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.52.33 µg/m³
PM108.29 µg/m³
O391.95 µg/m³
NO20.48 µg/m³
SO20.44 µg/m³
CO113.75 µg/m³
NH30 µg/m³
NO0.03 µg/m³