What is the air quality in San Mateo today?

The current Air Quality Index (AQI) in San Mateo is 19 (Good). PM2.5 concentration is 4.5 µg/m³.

What is the temperature in San Mateo right now?

The current temperature in San Mateo is 20.8°C (feels like 20.8°C). Humidity is 45.2% and wind speed is 23.6 km/h.

Is it safe to go outside in San Mateo?

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

Air Quality in San Mateo, United States

Clear

20.8°C · 45.2% humidity

20.8°

Feels 20.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

41 stations

Nearby Monitoring Stations

AQI Forecast

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Station readings 4h ago

AQI 0

PM2.5 0.0 µg/m³ · 4h ago

Air Quality Index Trend

32h · 1 stn

View full history →

San Mateo's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

45.2%

Humidity

23.6 km/h

Wind NW

1018.7 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.5 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for San Mateo?

Temperature & Precipitation

PM2.5 Trend

32h · 1 station

PM2.54.5 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (41 stations within 25 km)

4.5

Median

4.55

Average

3.4

Low

6.77

High

PM2.5 µg/m³ · Model: 5.8 · Bias: +1.3

What is the 7-day forecast for San Mateo?

10-20

22.3° 12.4°

10-21

22.8° 12.8°

0.13 mm

10-22

24.0° 12.5°

10-23

20.9° 13.2°

10-24

21.3° 12.6°

10-25

21.8° 12.5°

3.25 mm

10-26

20.9° 12.6°

Both models agree Avg diff: 2.7°C

Where are air quality stations near San Mateo?

Belle Air School

9.8 km PM2.5: 4.1 µg/m³

Garden Ave Residence

9.8 km PM2.5: 4.2 µg/m³

Parkside Intermediate School

10.1 km PM2.5: 4.2 µg/m³

San Bruno School District Office

10.4 km PM2.5: 4.1 µg/m³

San Bruno City Hall

10.4 km PM2.5: 4.3 µg/m³

7th & Walnut Park

10.5 km PM2.5: 4.5 µg/m³

Forest Lane Park

11.2 km PM2.5: 4.7 µg/m³

Pacific Ave Residence

11.6 km PM2.5: 4.8 µg/m³

Brentwood Park

12.6 km PM2.5: 3.9 µg/m³

California and Cypress Ave

12.8 km PM2.5: 4.5 µg/m³

What cities are near San Mateo?

19 Burlingame 19 Foster City 19 Belmont 18 Millbrae 19 San Carlos 19 San Bruno 20 Redwood City 22 South San Francisco 18 Pacifica 18 Menlo Park

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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 2026-10-20T20:06 UTC.