Weather in San Juan in September
San Juan, Puerto Rico averages a high of 31.1°C (88°F) and low of 24.6°C (76.3°F) in September, with 20 rain days and 10.8 hours of daily sunshine. Travel score: 67.6/100 (Good). The best time to visit San Juan is March.
High
31°C88°F
Low
25°C76°F
🌧️
20
rain days
☀️
10.8
hrs/day sunshine
💧
82%
humidity
68— Good
September in San Juan is hot and rainy — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in San Juan?
How much does it rain in San Juan in September?
San Juan receives an average of 127.3mm of rainfall across 20 rainy days in September. The annual total is 912.5mm.
What should I pack for San Juan in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light, breathable clothing
Hot weather with highs around 31°C
🧢
Sun hat or cap
Protection from intense sun
🧥
Waterproof jacket
Frequent rain expected (20 rainy days)
☔
Umbrella
Essential for the rainy season
👢
Waterproof shoes
Keep your feet dry in wet conditions
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to Puerto Rico in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31