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St. Barts Monthly Weather Averages: Rain, Temperatures

St. Barts monthly weather ranges from the low 80s Fahrenheit in the winter to the high 80s in the summer. Rainfall ranges from two inches a month in the dry season to six inches in the rainy season.

The weather is fairly predictable thanks to the historical data from Princess Juliana International Airport on St. Maarten, which is only about 15 miles away.

Visitors to St. Barts will find that this southern Caribbean island is warm throughout the year. But it’s the tropical storms in the fall that can ruin a vacation there.

The following temperature and rainfall numbers are based on historical averages and may easily vary from month to month. But they give St. Barts vacation planners a good sense of which months have the best and worst climate.

Average Daytime Temperatures

St. Maarten average temperatures
St. Barts has the same temperatures as St. Maarten, which is only 15 miles away. © 2020 Scott S. Bateman

The average high temperature in January, the coolest month of the year, is 83 degrees Fahrenheit, according to the Meteorological Department of St. Maarten. That average reaches 89 degrees from July through September.

The average low temperatures, which occur mainly at night, hover around 74 degrees from January through March and peak at 79 degrees from June through September. Ocean temperatures can reach as high as 86 degrees in the summer.

St. Barts Rainy Season

St. Barth average monthly rainfall
St. Barts average monthly rainfall

The island has a dry season that runs from December through May. The St. Barts rainy season goes from June through November.

The rainy season coincides with the annual Caribbean hurricane season that also goes from the beginning of June to the end of November.

The risk of storms or heavy rain is quite low in June and July. But it begins to pick up in August and reaches a high point in September, October and November.

Rainfall can reach five to six inches on average during those peak months. The fall is a risky time of year to visit St. Barth.

For the rest of the year, rainfall averages about two to three inches except for a brief spike to four inches in May. February and June are the months with the lowest rainfall at about two inches total.

Visitors who think about going to St. Barts during the fall may find prices are lower as a result of the risky weather.

In that case, they should consider travel insurance to protect themselves in case of a severe tropical storm or hurricane forces them to leave the island unexpectedly.

Scott S. Bateman is a professional journalist who has traveled widely throughout the Caribbean and the America.
September 08, 2021