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Weather & Climate in Halfmoon Bay, BC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Halfmoon Bay experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 36°F in January while summers reach 60°F in July. The area gets 230 sunny days per year, above the national average. Annual precipitation totals 58.2 inches (wetter than the 38-inch national average). The area receives 7.8 inches of snow annually. The city sits at an elevation of 128 feet.
Temperature
36°F Jan (2°C)
60°F Jul (16°C)
| Annual Average | 46.8°F |
| 13% below US avg | |
| January Average | 36°F (2°C) |
| July Average | 60°F (16°C) |
| Sunny Days | 230 days/yr |
Geography
| Elevation | 128 ft (39 m) |
| Area | 4.2 sq mi (10.8 km²) |
| Population Density | 672/sq mi |
| Coordinates | 49.5129°N, 123.9087°W |
| Timezone | America/Vancouver |
Precipitation & Snow
Air Quality
Earthquake History
195 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 | 147 km | 12 km |
| Jan 8, 2015 | 19 km E of Tofino, Canada | M4.8 | 132 km | 25 km |
| Feb 21, 2025 | 28 km W of Squamish, Canada | M4.8 | 33 km | 10 km |
| Jan 24, 2020 | 46 km WNW of Neah Bay, Washington | M4.5 | 142 km | 10 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 129 km | 16 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 37 km | 3 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 146 km | 0 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 88 km | 5 km |
| Jan 23, 2001 | 9 km NNW of Ucluelet, Canada | M4.3 | 133 km | 10 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 128 km | 23 km |
| Feb 22, 1996 | 31 km NNE of South Pender Harbour, Canada | M4.1 | 43 km | 2 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 147 km | 1 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 147 km | 3 km |
| Dec 27, 2012 | 12 km E of North Saanich, Canada | M4.0 | 107 km | 54 km |
| Sep 26, 2024 | 12 km E of Saanichton, Canada | M4.0 | 114 km | 52 km |
| May 16, 2001 | 35 km NE of Tofino, Canada | M3.9 | 119 km | 10 km |
| Nov 20, 1994 | 26 km N of Ucluelet, Canada | M3.9 | 124 km | 38 km |
| Feb 18, 2017 | 103 km NE of Campbell River, Canada | M3.9 | 145 km | 8 km |
| Apr 7, 2001 | 36 km NNW of Neah Bay, Washington | M3.9 | 110 km | 32 km |
| Sep 5, 2017 | 9 km NNE of Ucluelet, Canada | M3.8 | 126 km | 33 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 | — | 137 km |
| 1946 | BRITISH COLUMBIA | Eruption + Earthquake | 9.0 m | 1 | 83 km |
| 1958 | RIPPLE ROCK, BC | Earthquake + Landslide | 0.5 m | — | 118 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Garibaldi (75 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 75 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 80 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 81 km |
| Meager | Complex | 2,680 m (8,793 ft) | -410 | 128 km |
| Bridge River Cones | Volcanic field | 2,500 m (8,202 ft) | Unknown | 148 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 173 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 8.0 in | |
| February | 38°F (3°C) | 5.6 in | |
| March | 40°F (4°C) | 5.4 in | |
| April | 44°F (7°C) | 4.1 in | |
| May | 50°F (10°C) | 3.2 in | |
| June | 56°F (13°C) | 2.8 in | |
| July | 60°F (16°C) | 1.8 in | Driest |
| August | 61°F (16°C) | 2.0 in | Warmest |
| September | 55°F (13°C) | 2.3 in | |
| October | 47°F (8°C) | 6.1 in | |
| November | 40°F (4°C) | 9.2 in | Wettest |
| December | 36°F (2°C) | 7.8 in | Coldest |
Halfmoon Bay has a seasonal temperature swing of 25°F / from 36°F in December to 61°F in August. Total annual precipitation is 58.1 inches, with November being the wettest month (9.2") and July the driest (1.8").