What is the air quality in Mercer Island today?

The current Air Quality Index (AQI) in Mercer Island is 25 (Good). PM2.5 concentration is 6.13 µg/m³.

What is the temperature in Mercer Island right now?

The current temperature in Mercer Island is 17.3°C (feels like 17.3°C). Humidity is 47.7% and wind speed is 15.1 km/h.

Is it safe to go outside in Mercer Island?

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

Air Quality in Mercer Island, United States

Clear

17.3°C · 47.7% humidity

17.3°

Feels 17.3°

Good

Air quality is satisfactory. Enjoy outdoor activities.

23 stations

Nearby Monitoring Stations

AQI Forecast

17 10am

25 1pm

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Station readings

Air Quality Index Trend

48h · 2 stn

View full history →

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

47.7%

Humidity

15.1 km/h

Wind SW

1020.1 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.13 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Mercer Island?

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations

PM2.56.13 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (23 stations within 25 km)

6.13

Median

5.77

Average

0.05

Low

10.55

High

PM2.5 µg/m³ · Model: 6.5 · Bias: +0.4

What is the 7-day forecast for Mercer Island?

10-20

17.3° 8.8°

2.44 mm

10-21

14.4° 7.4°

0.06 mm

10-22

21.2° 5.9°

0.38 mm

10-23

15.8° 6.9°

1.94 mm

10-24

12.0° 5.7°

2.63 mm

10-25

13.7° 5.7°

10-26

13.6° 8.4°

3.62 mm

Both models agree Avg diff: 3.2°C

Where are air quality stations near Mercer Island?

SE 12th St, Bellevue, Washington, USA

6.5 km PM2.5: 7.9 µg/m³

SE 12th St, Bellevue, Washington, USA

6.5 km PM2.5: 5.5 µg/m³

Beacon Hill, Seattle, Washington, USA

6.5 km PM2.5: 3.1 µg/m³

Beacon Hill, Seattle, Washington, USA

6.5 km PM2.5: 5.0 µg/m³

Beacon Hill, Seattle, Washington, USA

6.5 km PM2.5: 7.0 µg/m³

Seattle-S Myrtle St

6.5 km PM2.5: 4.9 µg/m³

Seattle-16th Ave S

6.8 km PM2.5: 3.8 µg/m³

10th and Weller, Seattle, Washington, USA

7.9 km PM2.5: 4.1 µg/m³

10th and Weller, Seattle, Washington, USA

7.9 km PM2.5: 4.8 µg/m³

Olive St, Seattle, Washington, USA

8.1 km PM2.5: 4.3 µg/m³

What cities are near Mercer Island?

24 Columbia City 32 Bryn Mawr-Skyway 34 West Lake Sammamish 20 Seattle 30 Renton 32 Tukwila 22 Kirkland 29 Sammamish 25 Redmond 31 City of Sammamish

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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 2026-10-20T20:58 UTC.