The month in detail
What to expect in September
Autumn marks the end of peak season in Saint Barthélemy. Temperatures drop (82°F) and rain returns (32% of days). Expect rain on 32% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. May (8.8/10) is significantly better if possible.
September ranks 10 out of 12 months in Saint Barthélemy. Compared to August: 8 pts more rainy days, −0.5h of sun per day.
This month's conditions
What it's like in September
UV index
9 · very high
protection essential
Feels like
very humid
24°
Sea
30°C
warm, ideal
Daylight
12.1h of daylight
Air quality
good
AQI 20
Compare
Is September the right month?
The best month in Saint Barthélemy is May (8.8/10), 3.1 pts higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Saint Barthélemy
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Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
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🎟️ Activities & tours · Saint Barthélemy
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.
Country · Saint Barthélemy
🗣️LanguageFrench
💶CurrencyEuro (€)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘExpensive · 4/5
🌡️ Climate
🌍Climate typeTropical
📈Climate trend ⓘ+1.77°F/decade
🔥Hottest monthJuly · 82°F
❄️Coolest monthFebruary · 77°F
🌧️Rainiest month ⓘSeptember · 32%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘSeason Nov-Apr
🛂VisaSchengen · 90 days
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Similar climate
Saint MartinSaint Martin
Saint ThomasUS Virgin Islands
Turks and CaicosTurks and Caicos
Saint LuciaSaint Lucia
GrenadinesSaint Vincent and the Grenadines
Location
Where is Saint Barthélemy ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
Saint BarthélemyTropical climate with a 8.8 → 5.6 gap between best and worst month. 10 years of ERA5 data to choose by project.
17.90°N · 62.83°W
Questions
Frequently asked questions
What is the best time to visit Saint Barthélemy?
May is the best month with 81°F highs, 77°F lows, 8.0h of sunshine and 17.0% rainy days. The months of May & March offer comparable conditions.
How many hours of sunshine does Saint Barthélemy get in May?
Saint Barthélemy averages 8.0 sunshine hours per day in May. It is the sunniest month with a climate score of 8.3/10.
What is the rainiest month in Saint Barthélemy?
September is the most unfavourable month with September has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Saint Barthélemy in May?
In May, overnight lows reach 77°F, while afternoon highs average 81°F.
Is Saint Barthélemy good in winter?
In winter (December-February), Saint Barthélemy scores 7.9/10 on average — Acceptable conditions for cultural visits.. The best month overall remains May with a score of 8.3/10.
When should you avoid Saint Barthélemy?
September is the most difficult month to visit Saint Barthélemy, with September has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Saint Barthélemy in September?
In September, the sea averages 86°F in Saint Barthélemy: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Saint Barthélemy in September?
The average UV index reaches 9 in September in Saint Barthélemy (very high), with about 12.1h of daylight. Protection essential.