Upper Princeʼs Quarter Weather in September
September in Upper Princeʼs Quarter brings high temperatures, with highs of 30°C (86°F) and nights dropping to 27°C (81°F). Rainfall is on the higher side this month, averaging around 134 mm (5.3 in), so keep a rain jacket handy.
Rainfall in Upper Princeʼs Quarter in September
The climate data from previous years indicates about 19 days of rain, averaging 134 mm (5.3 in) for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Upper Princeʼs Quarter in September
Temperatures in Upper Princeʼs Quarter in September top out at 30°C (86°F) and drop to 27°C (81°F) overnight. This kind of day-to-night contrast is typical for this time of year. With overnight lows of 27°C (81°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably.
Sunshine in Upper Princeʼs Quarter in September
With approximately 232 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.
Wind Speed in Upper Princeʼs Quarter 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
With water at 29°C (84°F), conditions are warm and calm. Perfect for those who like tropical water temperatures, though it won't cool you down much.September in Upper Princeʼs Quarter 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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sint Maarten, check out our Upper Princeʼs Quarter's climate page.
Upper Princeʼs Quarter 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% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Upper Princeʼs Quarter 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
Historical weather for Upper Princeʼs Quarter in September
Browse day-by-day weather records for Upper Princeʼs Quarter spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Upper Princeʼs Quarter historical weather extremes in September
Based on weather observations in Upper Princeʼs Quarter between 1990 and 2025, these are the recorded extremes during September.
- On September 3, 1992, temperatures climbed to 36°C (97°F), marking the warmest September day on record.
- On September 21, 2008, Upper Princeʼs Quarter saw its coldest September day with temperatures maxing out at 27°C (81°F).
- The coldest night in September in Upper Princeʼs Quarter was on September 30, 2017, with a minimum of 22°C (72°F).
Best Places in Sint Maarten in September
Find out more about the weather in Sint Maarten and which places have the best travel conditions in this month. See all of Sint Maarten in September →
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What to Wear in Upper Princeʼs Quarter 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 Upper Princeʼs Quarter in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sint Maarten, check out our Upper Princeʼs Quarter's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Upper Princeʼs Quarter climate overview or explore weather in Sint Maarten.
