Half Moon Bay Weather in January
January in Half Moon Bay averages 16°C (61°F) during the day and 6°C (43°F) at night. Quite a bit of rainfall is typical this month, with around 91 mm (3.6 in) on average. An umbrella is a good idea.
Rainfall in Half Moon Bay in January
Looking at the last 30 years, the data shows about 10 days with rain, averaging 91 mm (3.6 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Half Moon Bay in January
In January, Half Moon Bay gets moderate temperatures, with highs of 16°C (61°F). Nights cool to around 6°C (43°F). The difference between afternoon and evening temperatures is usually noticeable. At 6°C (43°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Half Moon Bay in January
The area experiences a moderate amount of sunshine, with approximately 186 hours of sunlight expected. This means a decent mix of sun and overcast.
Wind Speed in Half Moon Bay in January
January has wind speeds averaging 3 m/s (6 knots). You can expect comfortable light winds that steadily move flags and feel mild throughout the day. Since this is an average, daily conditions vary from gentle winds to more active breezes.
Average water temperature in January
The water temperature is only 12°C (54°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.If you prefer dry days with pleasant temperatures, May, June, July, August, September and October typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 January
Min Temperature
6°C (43°F)
Max Temperature
16°C (61°F)
Water Temperature
12°C (54°F) *
Chance of Rain
33%
Precipitation
91 mm (3.6 in)
Rainy days
10 days
Humidity
80% *
Windspeed
3 m/s (6 knots) *
Sunshine
186 hours *
Percentage Sunshine
61% *
Best Places in the United States of America in January
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 January →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Half Moon Bay in January
The weather can swing between comfortable and chilly in January, 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. The water temperature sits at about 12°C (54°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Half Moon Bay in January
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.
