In Saint-Barthélemy, the climate is tropical, hot all year round, with a relatively cool season, from December to April, called "the Lent", and a warm and humid season, from May to November, called "the Wintering". Despite the name, the latter is a sultry period, characterized by many sunshine hours, but also by showers or thunderstorms, especially in the afternoon.
The temperature varies little throughout the year: the minimum ranges from 23 degrees Celsius (73 °F) in the period from January to March, to 26 °C (79 °F) in the period from June to September, while the maximum ranges from 29 °C (84 °F) to 32 °C (90 °F). In the hot and muggy period, however, sea breezes temper the heat.
Here are the average temperatures of the capital, Gustavia.
Gustavia - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)232323242526262626262524
Max (°C)292929303132323232313130
Min (°F)737373757779797979797775
Max (°F)848484868890909090888886

Precipitation is not abundant, since it amounts to about 1,000 millimeters (40 inches) per year. In the wettest months, from August to November, from 115 to 130 mm (4.5 to 5 in) of rain fall per month. From January to April, the driest period, the rainfall hovers around 45/65 mm (1.7/2.6 in) per month.
Here is the average precipitation.
Gustavia - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)65455565906080115125130125951050
Prec.(in)2.61.82.22.63.52.43.14.54.95.14.93.741.3
Days129891210111214141313137

The amount of sunshine is good in all seasons because the rains are usually intense but short-lived, so the sun often shines throughout the year.
Gustavia - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours889988898888

Saint-Barthélemy (also known as Saint-Barth or St. Barts) is a small island, which before 2007 was part of the French overseas department of Guadeloupe, while before 2003 it was an overseas territory of France.
Because of the lack of mountains and rivers, there is a certain shortage of water available, so the water is collected from the rain, desalinated from the sea or obtained from incinerators.

Saint-Barthélemy

In Saint-Barthélemy, as generally happens in the Lesser Antilles, being the sea always warm, you can swim all year round.
St.Barths - Sea temperature
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Temp (°C)262626262728282829292827
Temp (°F)797979798182828284848281

Hurricanes



From June to November, in Saint-Barthélemy as in all the Caribbean, there is the danger of tropical storms and hurricanes, which, however, are more likely from August to October.

Best Time



The best period to visit Saint-Barthélemy runs from December to April, since it is the least hot and the least rainy. The driest months are February and March. In May, both temperature and moisture increase, but the rains are not yet too abundant, and we are still out of the hurricane season. In June and July, we are by now in the hot and muggy season, although the rains are less frequent than in August and September, and hurricanes are less likely to occur.

What to pack



All year round: bring light clothes of natural fabric; possibly a light sweatshirt and a light raincoat for thunderstorms, especially from August to December; a light sweatshirt for the evening from December to March.
When going to the reef, you can bring snorkeling equipment, including water shoes or rubber-soled shoes.