In Aruba, the ocean temperature is consistently warm year-round, but it reaches its absolute peak in September and October. During these months, the Caribbean Sea temperatures around the island typically hover between 28°C and 29.5°C (82°F to 85°F). This "bathwater" temperature is the result of months of intense summer sun heating the shallow turquoise waters. Even in the "coolest" months of February and March, the water only dips to about 26°C (79°F), which is still remarkably comfortable for swimming and snorkeling. Because Aruba is located outside the traditional hurricane belt, these warm-water months of September and October are perfect for diving and seeing the diverse marine life at the Antilla Shipwreck without the need for a thick wetsuit. For travelers in 2026, this period also offers some of the calmest sea conditions, as the island's famous trade winds are slightly less intense than they are during the breezy winter months.