Your Cruise, Your Weather
Plan Your Cruise With Free Weather Forecasts
Loading Travel Forecast…Loading Travel Forecast…Loading Travel Forecast…Historical averages and packing recommendations for your September visit to Grand Cayman.
"Peak hurricane risk"
Affiliate links — these help keep our site free by earning us a commission at no extra cost to you.
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.
Caribbean Round-trip Orlando (Port Canaveral): Great Stirrup Cay & Cozumel
NCL Cruises · Jul 19, 2026
Festival At Sea
Celebrity Cruises · Jul 24, 2026
Western Caribbean Cruise From Port Canaveral
Disney Cruises · Jul 25, 2026
Western Caribbean
Carnival Cruises · Jul 26, 2026
Grand Cayman, Mexico & Perfect Day
Celebrity Cruises · Jul 26, 2026
Grand Cayman, Bahamas & Mexico
Celebrity Cruises · Aug 1, 2026
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.