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December signals the beginning of winter and is generally one of the coldest months of the year in the Northern Hemisphere. It's a time when many locations start getting frosty and snow may even start to fall, but there's no chance of building a snowman in San Diego. In December, San Diego's average temperature is around 57 °F (14 °C), which actually makes December the joint-coldest month of the year in the city alongside January.
Temperatures can reach highs of around 66 °F (19 °C) in San Diego in January, which is relatively mild, but can also drop down to cool lows of 49 °F (9 °C). These average December temperatures show us that even at the coldest time of year, conditions remain tolerably mild in San Diego, allowing people to go outside without fear of being too cold.
Average temperatures in San Diego in December start off relatively high and begin to decrease over the course of the month. For example, the early days of December have average temperatures of around 64 °F (18 °C), but the latter parts of December will see those temperatures drop down closer to 57 °F (14 °C), so if you do want to visit San Diego in December and want to enjoy the warmer temperatures, it makes sense to visit in the early weeks of the month.
In terms of rainfall, December is the second wettest month of the year in San Diego on average, with an estimated 51mm of rain expected to fall during this month. December sees an average of six rainy days in San Diego, and most of the city's annual precipitation falls during the winter months, so this is definitely one of the worst times of the year if you want to stay dry in San Diego.
Finally, it's worth noting that December is one of the least sunny months of the year for San Diego. The city gets an average of eight hours of sunshine per day during December, which is the same as the previous month of November and a little higher than the following month of January, which only sees seven hours of sunshine on average each day.
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