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Grand Case weather in September (Saint Martin)

Is Grand Case, Saint Martin a good destination in September, weather-wise? Here’s everything you need to plan your visit.

Temperatures

Typically, September in Grand Case includes high temperatures and high rainfall. Monthly maximum daytime temperatures generally peak at 30°C, but after sunset, they often decrease to around 27°C.

Precipitation

Grand Case in September usually receives high rainfall, averaging around 134 mm for the month. Climate statistics over the past 30 years suggest around 19 days of rain.

Average sunshine

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.

Average windspeed

September has wind speeds averaging 5 m/s. You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in September

With a water temperature of 29°C, the water has moved into genuinely warm territory that feels more like a heated pool than cool water. These tropical conditions are perfect for those who prefer their water on the warmer side.

September in Grand Case 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.

Select a Month of Interest

Check the conditions for any month of the year.

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

Grand Case, monthly averages in September

Min TemperatureMin Temperature 27°C  
Max TemperatureMax Temperature 30°C  
Water TemperatureWater Temperature 29°C *  
Chance of RainChance of Rain 62%  
PrecipitationPrecipitation 134 mm  
Rainy daysRainy days 19 days  
HumidityHumidity 78% *  
WindspeedWindspeed 5 m/s *  
SunshineSunshine 232 hours *  
Percentage SunshinePercentage Sunshine 61% *  
* Data from: Sint Maarten, Sint Maarten (8 KM, 5 Miles).

Where to go in Saint Martin in September

Find out more about the weather in Saint Martin and which places have the best travel conditions in this month.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Select a Month of Interest

Check the conditions for any month of the year.

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

So, what should you wear in this month?

It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool. However, there's a good chance of rain, so bring a raincoat just in case. With a water temperature of around 29°C this is a great month to swim so bring your swimwear.

What To Do

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

Interested in more climate information?

This site provides you with all the information you need about the climate in Grand Case.

Our site offers climate and forecast data for every country in the world. Are you going to Saint Martin? On this website you can find historical weather averages for many cities in Saint Martin. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.