Cool
Average highs are around 14°C, so pack for cooler days.
December verdict
Half Moon Bay, California, United States in December
Weather score24Poor
Poor for holiday weather
Average highs are around 14°C, so pack for cooler days. Sunshine averages 5h per day, enough for a balanced month. Rainfall averages 114mm, so some wet days are possible.
December weather
Monthly averages
Temp
14°C
Rain
114mm
Sun
5h
Sea
13°C
Weather score
24
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 114mm, so some wet days are possible.
Some sun
Sunshine averages 5h per day, enough for a balanced month.
Cool sea
Sea temperatures average 13°C, so the water can feel cool.
Map
Weather map
Compare Half Moon Bay, California, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December14°C average high
December has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJune to October
This stretch sets the upper range for average daytime heat.
Rain
December114mm average rain
December is wetter than Half Moon Bay's yearly average, so flexible plans matter more.
Driest monthsApril to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December5 hours average sun
December is one of Half Moon Bay's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December13°C average sea
December is below Half Moon Bay's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to October
Sea temperatures are usually near 14°C in this stretch, so swimming comfort is at its strongest.
Weather score
December24 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsMay to September
These months have the strongest weather score in the monthly averages.
