Saint-Barthelemy weather in September 2025
Saint-Barthelemy weather in September 2025
Day
31 °C
Night
25 °C
Sea
29 °C
Precipitation
104 mm
in month
Rainy days
13 days
in month
Daylight
12 hours
average
Sunshine
8 hours
average
Humidity
77 %
Day
31 °C
Night
25 °C
Sea
29 °C
Precipitation
104 mm
in month
Rainy days
13 days
in month
Daylight
12 hours
average
Sunshine
8 hours
average
Humidity
77 %
Overview: Saint-Barthelemy
Travel information
Weather charts for Saint-Barthelemy
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.
Find more destinations like this
Destinations in Saint-Barthelemy
Destinations with similar weather to Saint-Barthelemy
Weather overview and FAQs
Weather overview
In September in Saint-Barthelemy, the average air temperature ranges from 31 °C (87 °F) during the day to 25 °C (77 °F) at night. There are 13 days of rain on average, where the rainfall is 104 mm (4.09 in).
Is September a good month to visit Saint-Barthelemy?
September is one of the best months to visit Saint-Barthelemy. The daily temperatures in this month reach pleasant 31 °C (87 °F). The seawater temperature reaches ideal 29 °C (83 °F). At night, temperatures hover around a pleasant 25 °C (77 °F).
What is the temperature in Saint-Barthelemy during the day in September?
In Saint-Barthelemy in September, the average daily temperatures will be 31 °C (87 °F). The great temperature for lying by the sea or pool and sunbathing, everywhere else you will probably be a bit hot. Don't forget to drink during the day, in these temperatures you should hydrate yourself a lot.
What is the sea temperature in Saint-Barthelemy in September?
In September in Saint-Barthelemy expect the sea to be warm at 29 °C (83 °F). This temperature is someone's dream come true, while for someone it may no longer be ideal for the purpose of refreshment.
What is the average number of rainy days in Saint-Barthelemy in September?
There are 13 days, which are rainy in September in Saint-Barthelemy, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 3.1 days of the week, or in general - 44 % days.
How heavy is the precipitation in Saint-Barthelemy in September?
There is precipitation of 104 mm (4.09 in) in September in Saint-Barthelemy, which means 4 mm (0.14 in) rainfall per day on average.
What is the air temperature in September in Saint-Barthelemy at night?
The average night temperature in Saint-Barthelemy in September is 25 °C (77 °F). A very pleasant temperature for long evening walks, fun over a drink outside, or doing sports in the morning. If possible, look for a hotel with air conditioning.
How many hours of sun to expect in September in Saint-Barthelemy?
In Saint-Barthelemy in September, you can expect around 8 hours of sunshine.
How long is the day (from dawn till dusk) in Saint-Barthelemy in September?
The length of daylight in Saint-Barthelemy in September is 12 hours.
Is it hot in Saint-Barthelemy in September?
In Saint-Barthelemy in September, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
How humid is Saint-Barthelemy in September?
In Saint-Barthelemy in September, expect humidity around 77 %. This humidity is rather above average, but except for sensitive individuals, it should not be a problem.
Is Saint-Barthelemy rainier in September than in August?
No, September in Saint-Barthelemy is not a rainier month than August.
How windy is it in September in Saint-Barthelemy?
In Saint-Barthelemy in September, there will be an average wind scale of 5.
Is the weather in Saint-Barthelemy warmer in September than in August?
No, in Saint-Barthelemy in September the temperature is not higher than in August.