San Juan weather in April

Averages from 2021–2025 (150 days of record).

Average high: 84°F
Average low: 73°F
Rainy days: ~19 per month
Total precipitation: 3.6 in
Warmest recorded: 93°F
Coldest recorded: 66°F

Expect April days in San Juan to top out around 84°F and cool to about 73°F overnight, with roughly 19 days of measurable rain across the month. In recent years April has ranged from 66°F to 93°F.

Other months

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