Belmont Weather in December

December in Belmont averages 15°C (59°F) during the day and 5°C (41°F) at night. It is the wettest month of the year, with 99 mm (3.9 in) of rainfall on average, so waterproof gear is a must.

Rainfall in Belmont in December

Being the wettest month, having an umbrella on standby can help you avoid getting caught in the rain. Typically, you can expect about 12 days of rain this month, with 99 mm (3.9 in) on average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Belmont in December

In December, Belmont sees moderate temperatures, with highs of 15°C (59°F). Nights drop to around 5°C (41°F). December is in the winter season. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 5°C (41°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets. This month often claims the chilliest averages of the year.

Sunshine in Belmont in December

The area enjoys a balanced 160 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Wind Speed in Belmont 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.

If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Belmont. Our weather planner can help you explore destinations with more pleasant weather conditions.

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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 Belmont's climate page.

Belmont Temperature in December

Min Temperature 5°C (41°F)  

Max Temperature 15°C (59°F)  

Water Temperature 13°C (55°F) *  

Chance of Rain 41%  

Precipitation 99 mm (3.9 in)  

Rainy days 12 days  

Humidity 78% *  

Windspeed 3 m/s (6 knots) *  

Sunshine 160 hours *  

Percentage Sunshine 54% *  

* Data from: San Francisco, the United States of America (14 KM, 8 Miles).

What to Wear in Belmont in December

The weather can swing between comfortable and chilly in December, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. 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. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Belmont in December

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

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

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 Belmont's climate page.

More climate data for Belmont

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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