San Juan weather in March

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

Average high: 83°F
Average low: 72°F
Rainy days: ~16 per month
Total precipitation: 2.2 in
Warmest recorded: 92°F
Coldest recorded: 65°F

Expect March days in San Juan to top out around 83°F and cool to about 72°F overnight, with roughly 16 days of measurable rain across the month. In recent years March has ranged from 65°F to 92°F.

Other months

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Current San Juan forecast → · Historical data by Open-Meteo (ERA5).