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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.
Rating Newest Oldest. Best Answer: I agree with the first poster, San Diego in March is not that great for spring break. It can be sunny and in the 70's and 80's in March if there are Santa Ana winds or it can be cool, cloudy and in the 60's. But the average high is 66 so most likely it will be in the 60's.