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Sumas, WA
Full City Profile · Washington · Island County County
3.0
/5.0
B
Good
1,384
Population
942/sq mi density
$86,500
Median Income
$37,088 per capita
$362,000
Home Value
$490,954 Zillow
$997
Median Rent
40.2% income on rent
50°F
Avg Temperature
233 sunny days/yr
65
Violent Crime/100K
523 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$86,500 median income, 1.7% unemployment
A
Affordability
4.3 / 5.0
$362,000 home value, $997/mo rent
F
Safety
1.0 / 5.0
65 violent crimes/100K
C
Education
2.0 / 5.0
12.7% bachelor's degree or higher
Sumas experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 38°F in January while summers reach 64°F in July. The area gets 233 sunny days per year. Annual precipitation totals 49.9 inches. The area receives 10.8 inches of snow annually. Air quality is rated Good with a median AQI of 28.
Temperature
38°F Jan (3°C)
64°F Jul (18°C)
| Annual Average | 50.3°F |
| 7% below US avg | |
| January Average | 38°F (3°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 233 days/yr |
Geography
| Elevation | 40 ft (12 m) |
| Area | 0.6 sq mi (1.5 km²) |
| Population Density | 942/sq mi |
| Coordinates | 48.9955°N, 122.2685°W |
| Timezone | America/Los_Angeles |
| County | Island County County |
| Nearest Airport | Bellingham International (BLI) 19 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 | — | 56 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 143 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 104 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Baker (41 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 41 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 109 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 117 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 130 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 145 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (3°C) | 7.3 in | |
| February | 39°F (4°C) | 5.6 in | |
| March | 42°F (6°C) | 5.3 in | |
| April | 47°F (8°C) | 4.5 in | |
| May | 53°F (12°C) | 3.6 in | |
| June | 58°F (14°C) | 3.1 in | |
| July | 64°F (18°C) | 2.1 in | Warmest |
| August | 63°F (17°C) | 2.1 in | Driest |
| September | 58°F (14°C) | 3.0 in | |
| October | 49°F (10°C) | 5.5 in | |
| November | 41°F (5°C) | 8.5 in | Wettest |
| December | 36°F (2°C) | 7.6 in | Coldest |
Sumas has a seasonal temperature swing of 27°F / from 36°F in December to 64°F in July. Total annual precipitation is 58.0 inches, with November being the wettest month (8.5") and August the driest (2.1").