Mill Bay (BC) Temperature by Month

The average annual maximum temperature in Mill Bay, British Columbia, Canada is 14°C (57°F), with daytime highs ranging from 7°C (45°F) in December to 23°C (73°F) in August. This page covers monthly averages, day-night differences, and how Mill Bay compares to cities worldwide.

In Mill Bay, temperatures can shift dramatically between warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 14°C (57°F) in August to 2°C (36°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Mill Bay by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. August, the city's warmest month, gets 300 hours of sunshine.

The chart below shows the average temperature throughout the year:

Mill Bay's average annual maximum temperature is 14°C (57°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Mill Bay, December is the coolest month, with average highs of 7°C (45°F) and humidity around 78%, considered high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

For more on Mill Bay's weather, including monthly rainfall, sunshine hours, and humidity, visit our Mill Bay climate page.