All Countries
Marietta-Alderwood, WA
Full City Profile · Washington · Island County County
2.7
/5.0
C+
Fair
3,569
Population
613/sq mi density
$62,243
Median Income
$46,807 per capita
$493,200
Home Value
$608,145 Zillow
$1,450
Median Rent
31.9% income on rent
51°F
Avg Temperature
248 sunny days/yr
215
Violent Crime/100K
2,888 property/100K
C+
Overall
2.7 / 5.0
Fair overall score based on economy, affordability, safety and education
B+
Economy
3.9 / 5.0
$62,243 median income, 1.4% unemployment
C
Affordability
2.2 / 5.0
$493,200 home value, $1,450/mo rent
F
Safety
1.0 / 5.0
215 violent crimes/100K
B+
Education
3.6 / 5.0
33.1% bachelor's degree or higher
Marietta-Alderwood experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 40°F in January while summers reach 64°F in July. The area gets 248 sunny days per year. Annual precipitation totals 34.7 inches. Air quality is rated Good with a median AQI of 28.
Temperature
40°F Jan (5°C)
64°F Jul (18°C)
| Annual Average | 51.2°F |
| 5% below US avg | |
| January Average | 40°F (5°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 248 days/yr |
Geography
| Elevation | 120 ft (37 m) |
| Area | 2.9 sq mi (7.4 km²) |
| Population Density | 613/sq mi |
| Coordinates | 48.7881°N, 122.5552°W |
| Timezone | America/Los_Angeles |
| County | Island County County |
| Nearest Airport | Bellingham International (BLI) 1 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.0 / 100 |
| Social Vulnerability | 36.8 / 100 |
| Community Resilience | 80.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very Low |
| Volcano | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 38.0 m (125 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2007 | CHEHALIS LAKE, CHILLIWACK | Meteorological | 38.0 m | — | 85 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 112 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 82 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Baker (54 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 54 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 122 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 130 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 131 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 157 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 5.1 in | |
| February | 41°F (5°C) | 3.8 in | |
| March | 44°F (7°C) | 3.4 in | |
| April | 49°F (9°C) | 3.0 in | |
| May | 54°F (12°C) | 2.5 in | |
| June | 58°F (15°C) | 2.1 in | |
| July | 64°F (18°C) | 1.4 in | Warmest, Driest |
| August | 63°F (17°C) | 1.4 in | |
| September | 58°F (15°C) | 1.9 in | |
| October | 51°F (10°C) | 3.6 in | |
| November | 44°F (6°C) | 6.1 in | Wettest |
| December | 39°F (4°C) | 5.5 in | Coldest |
Marietta-Alderwood has a seasonal temperature swing of 25°F / from 39°F in December to 64°F in July. Total annual precipitation is 39.7 inches, with November being the wettest month (6.1") and July the driest (1.4").