Saint Martin Weather in September

Saint Martin in September sees high temperatures, with highs around 30°C (86°F) and overnight lows of 27°C (81°F). Rainfall is fairly high at around 134 mm (5.3 in) on average, so pack waterproofs just in case.

Rainfall in Saint Martin in September

Expect around 19 days of rain based on historical data, with 134 mm (5.3 in) average. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.

Temperature in Saint Martin in September

Daytime temperatures in Saint Martin reach 30°C (86°F) in September, dropping to 27°C (81°F) at night. This kind of day-to-night contrast is typical for this time of year. Nights are warm at 27°C (81°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.

Sunshine in Saint Martin in September

Enjoy a sunny month with about 232 hours of sunshine, the clear skies make Saint Martin even more beautiful.

Wind Speed in Saint Martin in September

Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.

Average water temperature in September

At 29°C (84°F), the water is very warm — more like a heated pool than the sea. Great for those who like warm water, though some may find it less refreshing on a hot day.

September in Saint Martin can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.

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For a detailed overview over the year and the best time to visit Saint Martin, check out our Saint Martin's climate page.

Saint Martin Temperature in September

Min Temperature 27°C (81°F)  

Max Temperature 30°C (86°F)  

Water Temperature 29°C (84°F) *  

Chance of Rain 62%  

Precipitation 134 mm (5.3 in)  

Rainy days 19 days  

Humidity 78% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 232 hours *  

Percentage Sunshine 61% *  

* Data from: Sint Maarten, Sint Maarten (5 KM, 3 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Saint Martin typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 27°C (81°F).

Average temperatures in September

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Historical weather for Saint Martin in September

Browse day-by-day weather records for Saint Martin spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Saint Martin historical weather extremes in September

Based on 35 years of weather observations in Saint Martin between 1990 and 2025, these are the recorded extremes.

• The hottest September day on record in Saint Martin reached 36°C (97°F) (September 3, 1992).
• The lowest daytime temperature in September was 27°C (81°F), recorded on September 4, 2009.
• The lowest overnight temperature recorded in September was 22°C (72°F) (September 30, 2017).

What to Wear in Saint Martin in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 29°C (84°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Saint Martin in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Saint Martin, check out our Saint Martin's climate page.

More climate data for Saint Martin

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Saint Martin climate overview or explore weather in Saint Martin.