Les Terres Basses Weather in September

Les Terres Basses in September averages 30°C (86°F) during the day and 27°C (81°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Les Terres Basses in September

You can typically expect 19 days of rain this month, averaging around 134 mm (5.3 in). Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.

Temperature in Les Terres Basses in September

Les Terres Basses in September gets highs of 30°C (86°F) during the day and drops to 27°C (81°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 27°C (81°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.

Sunshine in Les Terres Basses in September

Enjoy a sunny month with about 232 hours of sunshine, the clear skies make Les Terres Basses even more beautiful.

Wind Speed in Les Terres Basses 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

The water reaches 29°C (84°F) this month. It's on the warm side, which suits people who prefer that, but don't expect a cooling dip if the air temperature is also high.

September in Les Terres Basses 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 Les Terres Basses's climate page.

Les Terres Basses 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 (3 KM, 1 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Les Terres Basses 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 Les Terres Basses in September

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

Historical weather Temperatures Precipitation

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

‹ January February March April May June July August September October November December ›

Les Terres Basses historical weather extremes in September

Based on 35 years of weather observations (1990-2025), these are the most extreme conditions recorded in Les Terres Basses.

• On September 3, 1992, temperatures climbed to 37°C (99°F), marking the warmest September day on record.
• The lowest daytime temperature in September was 27°C (81°F), recorded on September 4, 2009.
• The coldest night in September in Les Terres Basses was on September 29, 2017, with a minimum of 22°C (72°F).

What to Wear in Les Terres Basses in September

Warm but pleasant conditions in Les Terres Basses in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. 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 Les Terres Basses 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 Les Terres Basses's climate page.

More climate data for Les Terres Basses

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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