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Weather & Climate in South Arm, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
South Arm experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 40°F in January while summers reach 65°F in July. The area gets 233 sunny days per year, above the national average. Annual precipitation totals 53.1 inches (wetter than the 38-inch national average). The area receives 20.8 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 10 feet.
Temperature
40°F Jan (5°C)
65°F Jul (19°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 40°F (5°C) |
| July Average | 65°F (19°C) |
| Sunny Days | 233 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 126.2 sq mi (326.8 km²) |
| Population Density | 59/sq mi |
| Coordinates | 49.1403°N, 123.1248°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
315 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Apr 14, 1990 | 4 km ENE of Deming, Washington | M5.0 | 78 km | 12 km |
| Feb 21, 2025 | 28 km W of Squamish, Canada | M4.8 | 69 km | 10 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 63 km | 16 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 38 km | 3 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 77 km | 0 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 68 km | 5 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 73 km | 23 km |
| Feb 22, 1996 | 31 km NNE of South Pender Harbour, Canada | M4.1 | 101 km | 2 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 77 km | 3 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 77 km | 1 km |
| Dec 27, 2012 | 12 km E of North Saanich, Canada | M4.0 | 55 km | 54 km |
| Sep 26, 2024 | 12 km E of Saanichton, Canada | M4.0 | 63 km | 52 km |
| Jul 1, 2009 | 4 km SE of Coupeville, Washington | M4.0 | 111 km | 58 km |
| Apr 7, 2001 | 36 km NNW of Neah Bay, Washington | M3.9 | 128 km | 32 km |
| Mar 6, 2025 | 14 km SW of Blyn, Washington | M3.9 | 135 km | 42 km |
| Mar 17, 2004 | 3 km SW of Clear Lake, Washington | M3.8 | 99 km | 0 km |
| Sep 8, 2022 | 7 km WNW of Lofall, Washington | M3.7 | 147 km | 23 km |
| Jun 16, 2017 | 2 km NNW of Quilcene, Washington | M3.7 | 146 km | 55 km |
| Dec 11, 1999 | 10 km NNE of Oak Bay, Canada | M3.7 | 68 km | 49 km |
| Aug 19, 2025 | 17 km NNW of Sekiu, Washington | M3.7 | 123 km | 38 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
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 | — | 89 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 130 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 133 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
7 volcanoes within 200 km. Closest: Garibaldi (79 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 79 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 89 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 104 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 110 km |
| Meager | Complex | 2,680 m (8,793 ft) | -410 | 168 km |
| Bridge River Cones | Volcanic field | 2,500 m (8,202 ft) | Unknown | 186 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 187 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (5°C) | 6.5 in | |
| February | 41°F (5°C) | 4.7 in | |
| March | 44°F (7°C) | 4.3 in | |
| April | 49°F (9°C) | 3.5 in | |
| May | 55°F (13°C) | 2.7 in | |
| June | 60°F (16°C) | 2.3 in | |
| July | 65°F (19°C) | 1.6 in | Warmest, Driest |
| August | 64°F (18°C) | 1.7 in | |
| September | 59°F (15°C) | 2.1 in | |
| October | 51°F (11°C) | 4.5 in | |
| November | 44°F (6°C) | 7.4 in | Wettest |
| December | 39°F (4°C) | 6.6 in | Coldest |
South Arm has a seasonal temperature swing of 27°F / from 39°F in December to 65°F in July. Total annual precipitation is 47.9 inches, with November being the wettest month (7.4") and July the driest (1.6").