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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.
The average low temperature in January for the country is 26.5 Â°F (â3.1 Â°C), and for San Diego it is 50 Â°F (10 Â°C). The average high temperature in July for San Diego is 76 Â°F (24 Â°C). The national average is 86.8 Â°F (30.4 Â°C).