San Diego, California weather in March

Averages from 2021–2025 (155 days of record).

Average high: 63°F
Average low: 49°F
Rainy days: ~9 per month
Total precipitation: 3.3 in
Warmest recorded: 83°F
Coldest recorded: 39°F

Expect March days in San Diego, California to top out around 63°F and cool to about 49°F overnight, with roughly 9 days of measurable rain across the month. In recent years March has ranged from 39°F to 83°F.

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Current San Diego, California forecast → · Historical data by Open-Meteo (ERA5).