Today | Weather | Wednesday, August 5, 2026

Weather in San Francisco, California

11:11 AM
Now
Cloudy Weather
63° F
Feels Like 63°
Precipitation 34 %
Wind 8 mph
UV Index (0 - 11+) 2
Humidity 84 %
Today
Cloudy Weather
Day 68°
Night 59°
Precipitation 49 %
Wind 10 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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

Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 5, 2025)
Cloudy Night

Day

64°

Night

55°

Wind

8 mph

Precipitation

0 %

Air Quality in San Francisco

NOW
101 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 35.71 µg/m³
PM10 49.79 µg/m³
O3 0.046 ppm
NO2 0.5 ppb
SO2 0.3 ppb
CO 0.17 ppm
NH3 0.2 µg/m³
NO 0.05 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:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)
PM2.535.71 µg/m³
PM1049.79 µg/m³
O390.21 µg/m³
NO21 µg/m³
SO20.76 µg/m³
CO200.25 µg/m³
NH30.2 µg/m³
NO0.05 µg/m³