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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.
Guide to San Diego weather in March. The average maximum daytime temperature in San Diego in March is a comfortable 19Â°C (66Â°F). The average night-time temperature is usually a cool 10Â°C (50Â°F). There are usually 9 hours of bright sunshine each day, which represents 71% of the 12 hours of daylight.