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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.
Key weather averages for San Diego in March. 1  19. 19Â°C max day temperature. 2  9. 9 hours of sunshine per day. 3  6. 6 days with some rainfall. 4  10. 10Â°C min night temperature. 5  12. 12 hours of daylight per day. 6  0. No heat & humidity. 7  51. 51 mm of monthly rainfall. 8  6. 6 (High) UV index. 9  15. 15Â°C sea temperature.