September Weather in the CaribbeanSeptember temperatures typically range from about 77 degrees Fahrenheit (25 degrees Celsius) to 88 degrees Fahrenheit (25 degrees Celsius), and the summer humidity is still lingering.
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Caribbean weather SeptemberThe more easterly islands including St Lucia and Trinidad are quite rainy at this time of year, while the western islands such as the Dominican Republic and Jamaica are relatively dry.
What month should you avoid in the Caribbean? Due to the risk of hurricanes, September and October are the months when it is wise to avoid the Caribbean.
Lying just off the coast of South America, desert-like Aruba is one of the best Caribbean islands to visit in September as it's a considerable distance from the seasonal storm belt and generally basks in sunshine year-round.
The average high in St Lucia is 31ºC in September so you can look forward to plenty of time on the beach. Temperatures only fall to 24ºC at night, meaning you won't need anything more than shorts and t-shirt for the evenings. The sea temperature's 29ºC, which is perfect for swimming, while humidity's high.
The wet season's from June to November so you'll get quite a lot of rain in September however there's still plenty of sun. The average high in St Lucia is 31ºC in September so you can look forward to plenty of time on the beach.
According to the U.S. National Weather Service (NWS), hurricane season in the Caribbean runs from June 1 through November 30 and normally peaks in August and September. The Caribbean region is a part of the Atlantic hurricane season, which also impacts Florida and other parts of the coastal southern United States.
The wettest months are September, October and November. As previous posters have noted, weather patterns are changing and, in particular, the rainy season seems to finish later (ie January) than used to be the case.
The heart of the Caribbean's high season is December, January, and February when the region experiences both moderate temperatures and its driest months. Because of spring holidays and generally good weather, March and April are also regarded as part of the high season.