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Caribbean Weather in August

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Curacao is one of the driest islands in August. Credit: © Curacao Tourist Bureau
The volume of rainfall takes a step up throughout the Caribbean in August as the annual hurricane season gets more active.

Caribbean weather in August historically averages three major storms with two that become hurricanes.

The chart below shows figures from the World Weather Organization that indicate August weather averages over various 30-year periods for 17 major Caribbean destinations.

It is important to keep in mind that the figures are averages and may vary from one year to the next. But they show trends that help in knowing what kind of weather to expect.

Caribbean Rain in August

Anyone wanting the lowest risk of rain will have an easy choice. Aruba and Curacao average about one inch of rain each August.

The ABC islands of Aruba, Bonaire and Curacao lie off the coast of Venezuela and just on the edge of the Caribbean hurricane belt.

They are the most arid islands in the region all year and see only slight increases of rain during the hurricane season.

On average, their rainfall increases from about one to two inches each month during most of the year to about three inches in September, October and November, according to Netherland Antilles Meteorology.

August Rain and Temperature Chart
LocationAvg Daily Min TempAvg Daily Max TempAvg Monthly Rainfall InchesAverage Monthly Rain Days
Cayman Islands73.091.96.418.0
Costa Rica62.177.49.9
Dominican Republic76.687.34.110.0
San Juan76.688.75.314.9
St. Lucia77.487.46.221.0
St. Maarten79.289.13.9
Several other destinations average about four inches of rain in August and also may be lower risk. They include Antigua, Cancun, Montego Bay, Punta Cana and St. Maarten.

Islands with a higher than normal risk of rain include Bahamas, Dominica and Martinique. Total rainfall in the Bahamas jumps by 50 percent versus July.

The popular Central American destinations of Belize and Costa Rica, which are famous for their rainforests, usually see high levels of rain as well.

Caribbean Temperatures in August

Staying warm won’t be a problem. Places such as Cancun, Cayman Islands, Cozumel, Aruba and Curacao all see average high temperatures exceed 90 degrees Fahrenheit.

Anyone who has visited those locations in the summer know that the heat can be unbearable at times, especially inland or walking on beach sand in the middle of the afternoon. Aruba and Curacao in particular have arid interiors with little to no shade.

Locations with more moderate temperatures include Antigua, St. Lucia and Dominican Republic.

Cruise Weather in August

Higher rainfall and hot temperatures make western Caribbean cruises less appealing in August for Cancun, Cozumel, Grand Cayman and the Central American countries.

Eastern cruise are only slightly better, but avoid the Bahamas because of much higher than normal rainfall. San Juan and St. Lucia also have wet months.

Southern Caribbean cruises are a better choice, especially for ones that visit the dry islands of Aruba and Curacao.

Anyone who wants to take a Caribbean cruise during the summer and has some flexibility with their schedules may want to cruise during July and especially during June. The average rainfall is lower for most destinations.

But August is better than September. September is the worst month of the year for rain, storms and hurricanes in the Caribbean.

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