San Juan weather in July

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

Average high: 86°F
Average low: 78°F
Rainy days: ~20 per month
Total precipitation: 3.3 in
Warmest recorded: 92°F
Coldest recorded: 73°F

Expect July days in San Juan to top out around 86°F and cool to about 78°F overnight, with roughly 20 days of measurable rain across the month. In recent years July has ranged from 73°F to 92°F.

Other months

January February March April May June August September October November December

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