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Mercer Island, WA
Full City Profile · Washington · Kitsap County County
3.1
/5.0
B
Good
25,282
Population
3,963/sq mi density
$202,359
Median Income
$120,120 per capita
$1,884,200
Home Value
$2,281,504 Zillow
$2,464
Median Rent
28.5% income on rent
54°F
Avg Temperature
249 sunny days/yr
30
Violent Crime/100K
1,405 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$202,359 median income, 1.5% unemployment
F
Affordability
1.4 / 5.0
$1,884,200 home value, $2,464/mo rent
F
Safety
1.0 / 5.0
30 violent crimes/100K
A+
Education
5.0 / 5.0
78.8% bachelor's degree or higher
Mercer Island experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 43°F in January while summers reach 67°F in July. The area gets 249 sunny days per year. Annual precipitation totals 36.5 inches. Air quality is rated Good with a median AQI of 28.
Temperature
43°F Jan (6°C)
67°F Jul (20°C)
| Annual Average | 53.8°F |
| 0% below US avg | |
| January Average | 43°F (6°C) |
| July Average | 67°F (20°C) |
| Sunny Days | 249 days/yr |
Geography
| Elevation | 78 ft (24 m) |
| Area | 6.4 sq mi (16.5 km²) |
| Population Density | 3,963/sq mi |
| Coordinates | 47.5640°N, 122.2312°W |
| Timezone | America/Los_Angeles |
| County | Kitsap County County |
| Nearest Airport | Boeing Field/King County International (BFI) 4 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| PM2.5 (Fine Particles) | 4.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 92.3 / 100 |
| Social Vulnerability | 12.2 / 100 |
| Community Resilience | 72.9 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | No Rating |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1894 | PUYALLUP RIVER DELTA, TACOMA, WA | Meteorological | 3.0 m | 2 | 35 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 107 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | — | 37 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | — | 8 | 53 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 56 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
7 volcanoes within 200 km. Closest: Rainier (87 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 87 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 103 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 138 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 152 km |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 161 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 184 km |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 188 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 43°F (6°C) | 5.3 in | |
| February | 42°F (6°C) | 4.2 in | |
| March | 45°F (7°C) | 4.1 in | |
| April | 49°F (10°C) | 3.0 in | |
| May | 55°F (13°C) | 2.0 in | |
| June | 60°F (16°C) | 1.7 in | |
| July | 67°F (20°C) | 1.0 in | Warmest, Driest |
| August | 65°F (19°C) | 1.2 in | |
| September | 60°F (16°C) | 1.8 in | |
| October | 52°F (11°C) | 3.3 in | |
| November | 45°F (7°C) | 5.8 in | |
| December | 40°F (4°C) | 6.3 in | Coldest, Wettest |
Mercer Island has a seasonal temperature swing of 27°F / from 40°F in December to 67°F in July. Total annual precipitation is 39.5 inches, with December being the wettest month (6.3") and July the driest (1.0").