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.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Millbrae's climate page.

Millbrae Temperature in December

Min Temperature 7°C (45°F)  

Max Temperature 14°C (57°F)  

Water Temperature 13°C (55°F) *  

Chance of Rain 43%  

Precipitation 117 mm (4.6 in)  

Rainy days 13 days  

Humidity 78% *  

Windspeed 3 m/s (6 knots) *  

Sunshine 160 hours *  

Percentage Sunshine 54% *  

* Data from: San Francisco, the United States of America (2 KM, 1 Miles).

What to Wear in Millbrae in December

The weather can be unpredictable in December, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 13°C (55°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Millbrae in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

5/10

Walking

5/10

Camping

3/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Millbrae's climate page.

More climate data for Millbrae

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Millbrae climate overview or explore weather in the United States of America.