Half Moon Bay Weather in December
Half Moon Bay in December sees moderate daytime temperatures of 15°C (59°F) and nighttime lows of 6°C (43°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.
Rainfall in Half Moon Bay in December
With frequent rain showers this month, having an umbrella on hand will keep you dry. You can typically expect 14 days of rain this month, averaging around 144 mm (5.7 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Half Moon Bay in December
In December, expect moderate temperatures in Half Moon Bay, with highs of 15°C (59°F) and lows of 6°C (43°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights drop to 6°C (43°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet. With moderate temperatures, December stands out as the chilliest month of the year.
Sunshine in Half Moon Bay in December
The area enjoys a moderate level of sunlight, with around 160 hours. It's a good balance between sunny and cloudy days.
Wind Speed in Half Moon Bay in December
Wind speeds average 3 m/s (6 knots) during December. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.
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 Half Moon Bay. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Half Moon Bay's climate page.
Half Moon Bay Temperature in December
Min Temperature
6°C (43°F)
Max Temperature
15°C (59°F)
Water Temperature
13°C (55°F) *
Chance of Rain
47%
Precipitation
144 mm (5.7 in)
Rainy days
14 days
Humidity
78% *
Windspeed
3 m/s (6 knots) *
Sunshine
160 hours *
Percentage Sunshine
54% *
Best Places in the United States of America in December
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in December →
perfect weather
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tolerable
unpleasant
poor
What to Wear in Half Moon Bay in December
Pack for changing conditions in Half Moon Bay in December. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. With water temperatures around 13°C (55°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Half Moon Bay in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Half Moon Bay's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Half Moon Bay climate overview or explore weather in the United States of America.
