December San Diego Weather

December San Diego Weather is heavenly in comparison to the most of the rest of the US. The average high temperature is around 19C, and the average low is barely brisk at 9C. December is the wettest month of the year in San Diego, however, at around 23cm on average for December the amount of precipitation is still very low. You may want to bring an umbrella or poncho, although the chances are still in your favor for a dry, warm San Diego day.