Cool
Average highs are around 19°C, so pack for cooler days.
December verdict
San Diego, California, United States in December
Weather score44Mixed
Mixed for holiday weather
Average highs are around 19°C, so pack for cooler days. Sunshine averages 7.4h per day, enough for a balanced month. Rainfall averages 37mm, which is relatively low for holiday planning.
December weather
Monthly averages
Temp
19°C
Rain
37mm
Sun
7.4h
Sea
16°C
Weather score
44
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 37mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 7.4h per day, enough for a balanced month.
Cool sea
Sea temperatures average 16°C, so the water can feel cool.
Map
Weather map
Compare San Diego, California, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December19°C average high
December has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJuly to September
This stretch sets the upper range for average daytime heat.
Rain
December37mm average rain
December is wetter than San Diego'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
December7.4 hours average sun
December is one of San Diego's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril and July to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December16°C average sea
December is below San Diego's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.
Weather score
December44 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 monthsJuly to September
These months have the strongest weather score in the monthly averages.
Hotels in San Diego, California, United States
Marriott
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The US Grant, a Luxury Collection Hotel, San DiegoSan Diego, California, USA
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