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The average sea surface temperature in February 2015 for San Diego was 63.6Â°F. The maximum and minimum values were 63.0Â°F and 64.0Â°F respectively.
1 According to the Holdridge life zones system of bioclimatic classification San Diego, California is situated in or near the warm temperate thorn steppe biome.  The annual average temperature is 17.9 degrees Celsius (64.2 degrees Fahrenheit). See the temperatures page for a monthly breakdown and the fixed scale graph.