Swimming in Saint-Barthelemy in september 2025 Sea temperature by city in september
Do you want to go to the beach in Saint-Barthelemy in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in Saint-Barthelemy by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Saint-Barthelemy in september 2025
Here, find the average sea temperature in Saint-Barthelemy in september in several coastal cities.
85°F
min: 84°F / max: 87°F
Grand Cul-de-Sac
85°F
min: 84°F / max: 87°F
Colombier (Saint-Barth)
85°F
min: 83°F / max: 87°F
Chevreau Island
85°F
min: 84°F / max: 87°F
Fourchue Island
85°F
min: 84°F / max: 87°F
Frégate Island
85°F
min: 84°F / max: 87°F
Nikki Beach
85°F
min: 83°F / max: 87°F
Where should you go swimming in Saint-Barthelemy in the month of september?
Swimming in Saint-Barthelemy in september is ideal
In september in Saint-Barthelemy swimming conditions are generally the same everywhere.
In september in Gustavia, Grand Cul-de-Sac, Colombier (Saint-Barth), Chevreau Island, Fourchue Island, Frégate Island and Nikki Beach, swimming conditions are perfect! With water reaching a maximum of 87°F and an average of 85°F, going in the water (and staying there!) feels great.
Where to go swimming in Saint-Barthelemy in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Gustavia
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 84°F | ||
| Maximum sea temperature | 87°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 86°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 8.3in | ||
| Number of days of precipitation | 11 jour(s) (38%) | ||
| Cloud cover | 39% | ||
| Our opinion | ideal swimming |
More information on swimming in Gustavia in september
Grand Cul-de-Sac
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 84°F | ||
| Maximum sea temperature | 87°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 86°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 8.3in | ||
| Number of days of precipitation | 11 jour(s) (38%) | ||
| Cloud cover | 39% | ||
| Our opinion | ideal swimming |
Colombier (Saint-Barth)
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 83°F | ||
| Maximum sea temperature | 87°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 86°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 8.3in | ||
| Number of days of precipitation | 11 jour(s) (38%) | ||
| Cloud cover | 39% | ||
| Our opinion | ideal swimming |
Chevreau Island
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 84°F | ||
| Maximum sea temperature | 87°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 86°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 8.3in | ||
| Number of days of precipitation | 11 jour(s) (38%) | ||
| Cloud cover | 39% | ||
| Our opinion | ideal swimming |
Fourchue Island
| September | |||
| Average sea temperature | 85°F | ||
| Minimum sea temperature | 84°F | ||
| Maximum sea temperature | 87°F | ||
| Average outside temperature | 85°F | ||
| Maximum outside temperature | 86°F | ||
| Minimum outside temperature | 83°F | ||
| Precipitation | 8.3in | ||
| Number of days of precipitation | 11 jour(s) (38%) | ||
| Cloud cover | 39% | ||
| Our opinion | ideal swimming |
List of coastal cities in Saint-Barthelemy
| Gustavia in september | ideal swimming |
| Grand Cul-de-Sac in september | ideal swimming |
| Colombier (Saint-Barth) in september | ideal swimming |
| Chevreau Island in september | ideal swimming |
| Fourchue Island in september | ideal swimming |
| Frégate Island in september | ideal swimming |
| Nikki Beach in september | ideal swimming |