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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 March 2018. Expect 19Â°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in San Diego in March. Check more long-term weather averages for San Diego in March before you book your next holiday to California in 2018.