As for rainfall, averages vary across the region, with the driest islands — Anguilla and Aruba — lying at the Caribbean's northern and southern extremities.

If you are looking for the driest island in the Caribbean during August, your best bets are the "ABC Islands" (Aruba, Bonaire, and Curaçao). Unlike the majority of the Caribbean, which enters its peak rainy and hurricane season in August, the ABC islands are located in the far southern Caribbean, just off the coast of South America, and sit outside the hurricane belt. They have an arid, desert-like climate with very little annual rainfall. Aruba, in particular, is famous for its "guaranteed sun," receiving only about 18 inches of rain per year. While lush islands like St. Lucia or Jamaica might experience daily tropical downpours in August, Aruba typically remains sunny and breezy, with the constant trade winds helping to mitigate the humid 90°F (32°C) heat. This makes it a premier 2026 summer destination for travelers who want to avoid the risk of storm-related travel disruptions. Other relatively dry options in August include the Turks and Caicos, though they do carry a higher risk of being affected by passing tropical systems compared to the deep-south ABCs.