San Juan weather in June

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

Average high

88°F

Average low

77°F

Rainy days

~17 per month

Total precipitation

2.7 in

Warmest recorded

97°F

Coldest recorded

72°F

Expect June days in San Juan to top out around 88°F and cool to about 77°F overnight, with roughly 17 days of measurable rain across the month. In recent years June has ranged from 72°F to 97°F.