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Weather & Climate in Cowichan Bay, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Cowichan Bay experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 37°F in January while summers reach 62°F in July. The area gets 253 sunny days per year, above the national average. Annual precipitation totals 45.9 inches (wetter than the 38-inch national average). The city sits at an elevation of 292 feet.
Temperature
37°F Jan (3°C)
62°F Jul (17°C)
| Annual Average | 49.1°F |
| 9% below US avg | |
| January Average | 37°F (3°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 253 days/yr |
Geography
| Elevation | 292 ft (89 m) |
| Area | 8.9 sq mi (23.2 km²) |
| Population Density | 313/sq mi |
| Coordinates | 48.7337°N, 123.6174°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
463 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 | 107 km | 12 km |
| Jun 23, 1997 | 2 km NE of Enetai, Washington | M4.9 | 148 km | 13 km |
| Apr 25, 2003 | 26 km W of Brinnon, Washington | M4.8 | 121 km | 51 km |
| Feb 21, 2025 | 28 km W of Squamish, Canada | M4.8 | 107 km | 10 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 130 km | 62 km |
| Jan 24, 2020 | 46 km WNW of Neah Bay, Washington | M4.5 | 117 km | 10 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 61 km | 16 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 56 km | 3 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 105 km | 0 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 125 km | 5 km |
| Jan 23, 2001 | 9 km NNW of Ucluelet, Canada | M4.3 | 147 km | 10 km |
| Feb 22, 1996 | 31 km NNE of South Pender Harbour, Canada | M4.1 | 131 km | 2 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 46 km | 23 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 146 km | 15 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 106 km | 1 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 105 km | 3 km |
| Sep 26, 2024 | 12 km E of Saanichton, Canada | M4.0 | 32 km | 52 km |
| Dec 27, 2012 | 12 km E of North Saanich, Canada | M4.0 | 28 km | 54 km |
| Jul 1, 2009 | 4 km SE of Coupeville, Washington | M4.0 | 94 km | 58 km |
| Nov 20, 1994 | 26 km N of Ucluelet, Canada | M3.9 | 149 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 | — | 143 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 82 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 119 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Garibaldi (132 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 132 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 132 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 141 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 156 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 197 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 37°F (3°C) | 7.8 in | Coldest, Wettest |
| February | 40°F (4°C) | 4.8 in | |
| March | 43°F (6°C) | 4.3 in | |
| April | 47°F (8°C) | 2.8 in | |
| May | 53°F (11°C) | 1.9 in | |
| June | 58°F (14°C) | 1.5 in | |
| July | 62°F (17°C) | 0.9 in | Driest |
| August | 63°F (17°C) | 1.2 in | Warmest |
| September | 58°F (14°C) | 1.3 in | |
| October | 50°F (10°C) | 4.3 in | |
| November | 42°F (6°C) | 7.7 in | |
| December | 38°F (3°C) | 7.5 in |
Cowichan Bay has a seasonal temperature swing of 25°F / from 37°F in January to 63°F in August. Total annual precipitation is 45.9 inches, with January being the wettest month (7.8") and July the driest (0.9").