What is the air quality in Foster City today?

The current Air Quality Index (AQI) in Foster City is 20 (Good). PM2.5 concentration is 4.91 µg/m³.

What is the temperature in Foster City right now?

The current temperature in Foster City 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 Foster City?

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

Air Quality in Foster City, United States

Clear

20.8°C · 45.2% humidity

20.8°

Feels 20.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

50 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 →

Foster City'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▲

4.91 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Foster City?

Temperature & Precipitation

PM2.5 Trend

32h · 1 station

PM2.54.91 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (50 stations within 25 km)

4.91

Median

4.68

Average

2.99

Low

11.0

High

PM2.5 µg/m³ · Model: 5.8 · Bias: +0.9

What is the 7-day forecast for Foster City?

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 Foster City?

Redwood City, San Mateo, California

10.3 km PM2.5: 10.8 µg/m³

Redwood City, San Mateo, California

10.3 km PM2.5: 5.8 µg/m³

Emerald Hills

11.6 km PM2.5: 3.8 µg/m³

Belle Air School

13.9 km PM2.5: 3.9 µg/m³

Garden Ave Residence

14.0 km PM2.5: 4.2 µg/m³

7th & Walnut Park

14.5 km PM2.5: 4.4 µg/m³

Parkside Intermediate School

14.5 km PM2.5: 4.1 µg/m³

San Bruno City Hall

14.6 km PM2.5: 4.2 µg/m³

San Bruno School District Office

14.6 km PM2.5: 4.1 µg/m³

Forest Lane Park

15.3 km PM2.5: 4.6 µg/m³

What cities are near Foster City?

22 Belmont 20 San Mateo 24 San Carlos 29 Redwood City 19 Burlingame 18 Millbrae 25 Menlo Park 18 San Bruno 18 East Palo Alto 21 South San Francisco

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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 2026-10-20T20:56 UTC.