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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.
Weather in San Diego in September. The average maximum daytime temperature in San Diego in September is a warm 26Â°C (79Â°F) with low heat & humidity. There are usually 9 hours of bright sunshine each day, which represents 70% of the 12 hours of daylight. The average sea temperature in and around San Diego in September is 20Â°C (68Â°F). Expect 4mm (0.2 inches) of rainfall across the whole of September with 1 day with some rain falling. Maximum UV levels will be very high (8 UV index) at midday when the skies are clear.