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Historical averages and packing recommendations for your September visit to Grand Cayman.
"Peak hurricane risk"
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Grand Cayman is the largest of the Cayman Islands and a regular western Caribbean port. Seven Mile Beach runs down the island's west side, calm and lined with beach bars. At Stingray City, a shallow sandbar offshore, you can stand in waist-deep water while southern stingrays glide past your legs.
Grand Cayman in September is warm and sunny, with average highs around 89°F and lows that rarely dip below 77°F. September sees roughly 13 rainy days, so waterproof layers and flexible plans are wise. Showers are often short-lived but can be intense. Peak hurricane risk
It's the shoulder season in Grand Cayman: fewer crowds than the winter peak, but the heat and humidity are at their highest. A light rain jacket and early-morning excursions will serve you well. Pack reef-safe SPF 50+ sunscreen, a hat, and breathable fabrics. The sun at 89°F is intense, especially near the water.
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The average high temperature in Grand Cayman during September is 89°F, with a low of 77°F.
Grand Cayman typically sees 13 days of rain in September. Peak hurricane risk
For a September cruise to Grand Cayman, you should pack lightweight, breathable clothing, swimwear, and sun protection.