Millbrae Weather in December

December in Millbrae brings moderate temperatures around 14°C (57°F) during the day, dropping to 7°C (45°F) at night, with the most rainfall of the year.

Rainfall in Millbrae in December

Since this month has the highest rainfall, keep an umbrella with you to handle sudden showers. Typically, you can expect about 13 days of rain this month, with 117 mm (4.6 in) on average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Millbrae in December

December in Millbrae brings moderate temperatures, with highs of 14°C (57°F) and nights around 7°C (45°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows around 7°C (45°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep. This month is marked by the mildest temperatures of the year.

Sunshine in Millbrae in December

The city usually sees around 160 hours of sunlight, indicating a moderately sunny period.

Wind Speed in Millbrae in December

Average wind speeds reach 3 m/s (6 knots) in December, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.

Average water temperature in December

The water is 13°C (55°F) this month, cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

December in Millbrae can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.