Cul de Sac Weather in September

With daytime temperatures of 30°C (86°F) and nighttime lows of 27°C (81°F), September in Cul de Sac brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 134 mm (5.3 in) falls on average.

Rainfall in Cul de Sac in September

On average, there are about 19 days with rain during this month, averaging 134 mm (5.3 in). 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 Cul de Sac in September

In September, Cul de Sac sees high temperatures, with highs of 30°C (86°F). Nights drop to around 27°C (81°F). This kind of day-to-night contrast is typical for this time of year. Nights remain warm at around 27°C (81°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.

Sunshine in Cul de Sac in September

The days are predominantly sunny, with an estimated total of around 232 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

Wind Speed in Cul de Sac 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 Cul de Sac has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations 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 Cul de Sac's climate page.

Cul de Sac 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 (10 KM, 6 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Cul de Sac 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 Cul de Sac in September

Browse day-by-day weather records for Cul de Sac 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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Cul de Sac historical weather extremes in September

Based on weather observations in Cul de Sac between 1990 and 2025, these are the recorded extremes during September.

• Cul de Sac recorded its highest September temperature of 38°C (100°F) on September 1, 2016.
• Cul de Sac experienced its chilliest September day on September 4, 2009, reaching only 27°C (81°F).
• The lowest overnight temperature recorded in September was 20°C (68°F) (September 8, 2012).

What to Wear in Cul de Sac 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Cul de Sac 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 Cul de Sac's climate page.

More climate data for Cul de Sac

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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