The month in detail
What to expect in September
Autumn marks the end of peak season in Saint Martin. Temperatures drop (81°F) and rain returns (31% of days). Expect rain on 31% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. June (8.8/10) is significantly better if possible.
September ranks 12 out of 12 months in Saint Martin. Compared to August: 5 pts more rainy days.
This month's conditions
What it's like in September
UV index
8 · very high
protection essential
Feels like
very humid
22°
Sea
30°C
warm, ideal
Daylight
12.1h of daylight
Air quality
excellent
AQI 19
Compare
Is September the right month?
The best month in Saint Martin is June (8.8/10), 3.2 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 Martin
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Saint Martin
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 Martin
🗣️LanguageFrench
💶CurrencyEuro (€)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘExpensive · 4/5
🌡️ Climate
🌍Climate typeTropical
📈Climate trend ⓘ+1.57°F/decade
🔥Hottest monthAugust · 81°F
❄️Coolest monthJanuary · 75°F
🌧️Rainiest month ⓘSeptember · 31%
🏝️ 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 BarthélemySaint Barthélemy
Saint ThomasUS Virgin Islands
Saint LuciaSaint Lucia
San JuanPuerto Rico
AntiguaAntigua and Barbuda
Location
Where is Saint Martin ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
Saint MartinTropical climate with a 8.8 → 5.6 gap between best and worst month. 10 years of ERA5 data to choose by project.
18.07°N · 63.05°W
Questions
Frequently asked questions
What is the best time to visit Saint Martin?
June is the best month with 79°F highs, 77°F lows, 8.3h of sunshine and 16.0% rainy days. The months of June & March offer comparable conditions.
How many hours of sunshine does Saint Martin get in June?
Saint Martin averages 8.3 sunshine hours per day in June. It is the sunniest month with a climate score of 8.2/10.
What is the rainiest month in Saint Martin?
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 Martin in June?
In June, overnight lows reach 77°F, while afternoon highs average 79°F.
Is Saint Martin good in winter?
In winter (December-February), Saint Martin scores 7.8/10 on average — Acceptable conditions for cultural visits.. The best month overall remains June with a score of 8.2/10.
When should you avoid Saint Martin?
September is the most difficult month to visit Saint Martin, 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 Martin in September?
In September, the sea averages 86°F in Saint Martin: warm, ideal. Ideal conditions for swimming and snorkeling.
Do you need sun protection in Saint Martin in September?
The average UV index reaches 8 in September in Saint Martin (very high), with about 12.1h of daylight. Protection essential.