East winds and moderate temperatures make the climate pleasant year-round. Average daytime temperatures range from the mid-70s to mid-80s F/23-30 C but do climb into the low 90s F/32-35 C on occasion during the summer months. Rain falls primarily during hurricane season (July-November); the wettest months are September-November. The best diving conditions are in the summer (warmest water, best visibility and calmest seas). No matter when you go, take a light sweater for the evenings and a waterproof Windbreaker for boat trips.
What to Wear
Modest dress is expected in the business district of Grand Cayman—which means no swimwear in town. Aside from this restriction, casual summer clothing is recommended year-round, day and night. Most restaurants require shoes and a T-shirt if you are going straight from the beach. During the winter months (especially January-March) take a light sweater. Some restaurants are quite smart, and you will want to dress up a little for them. If you're spending time on a boat, a waterproof Windbreaker will come in handy if the sea turns choppy.
