Weather in St. Barts in September
St. Barts, Saint Barthélemy averages a high of 28.3°C (82.9°F) and low of 26.6°C (79.9°F) in September, with 16 rain days and 11.1 hours of daily sunshine. Travel score: 69.8/100 (Good). The best time to visit St. Barts is March.
High
28°C83°F
Low
27°C80°F
🌧️
16
rain days
☀️
11.1
hrs/day sunshine
💧
81%
humidity
70— Good
September in St. Barts is hot and rainy — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in St. Barts?
How much does it rain in St. Barts in September?
St. Barts receives an average of 115.9mm of rainfall across 16 rainy days in September. The annual total is 760.4mm.
What should I pack for St. Barts in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 28°C
🧥
Waterproof jacket
Frequent rain expected (16 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 Saint Barthélemy 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