What is the air quality in San Francisco today?

The current Air Quality Index (AQI) in San Francisco is 26 (Good). PM2.5 concentration is 6.15 µg/m³.

What is the temperature in San Francisco right now?

The current temperature in San Francisco is 18.8°C (feels like 18.8°C). Humidity is 98.0% and wind speed is 19.4 km/h.

Is it safe to go outside in San Francisco?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in San Francisco, Costa Rica

Rain

18.8°C · 98.0% humidity

18.8°

Feels 18.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

42h · 1 stn

View full history →

San Francisco's air quality is influenced by vehicle emissions, industrial activity, and seasonal agricultural burning. Pollution patterns vary with dry and wet seasons.

98.0%

Humidity

19.4 km/h

Wind WSW

1011.9 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.15 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for San Francisco?

Temperature & Precipitation

PM2.5 Trend

42h · 1 station

PM2.56.15 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (1 station within 25 km)

6.15

Median

6.15

Average

6.15

Low

6.15

High

PM2.5 µg/m³ · Model: 6.0 · Bias: -0.2

Both models agree Avg diff: 4.1°C

Where are air quality stations near San Francisco?

NASA GSFC Rutgers Calib. N13

11.3 km PM2.5: 6.2 µg/m³

What cities are near San Francisco?

26 Heredia 26 Mercedes Norte 26 San Pablo 26 San Juan 26 Colima 26 San Rafael 26 San José 26 Calle Blancos 26 San Vicente 26 Guadalupe

Get AQI alerts for San Francisco

Notify me when air quality reaches:

ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-21T19:31 UTC.