Converting the averages to celsius, the avgerages work out to about 19c for the high, 9.5c for the low in December.
The link I referenced above will also allow you to see what the all-time highs and lows have been.
It does rain in December but Jan., Feb., March usually have more rainfall.Edited: 12:36 pm, July 12, 2011
Oops, I just realized that there is a box in the top, right-hand corner of the link I referenced that will change everything to celsius and metrics. My bad.
Weather can be iffy, I certainly would not plan on lying at the beach in 80 degree weather (though a Santa Ana condition is possible, but not likely)...it also could be possible for some rain. I would expect low-mid 60's and plan on bringing a jacket for early morning or late evening....I like to tell everyone San Diego has the warmest and coldest 60 degrees F I have ever felt.
That is so true... 60 degrees on a sunny winter day in my backyard is pleasant, and even warm if the sun reflects off the house. But 60 degrees on a summer night at the bay with a breeze can seem surprisingly cold.
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