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.