The strongest reading on the islands right now is 9 kph at Grand Cayman — a light air day on the water.

Diving

Favourable — flat-water visibility, easy entries.

Sailing

Slow, drifting day — best for cruisers and instruction.

Fishing

Comfortable on any side of the island.

Rule of thumb: under 10 knots (about 18 kph) is favourable for diving; 10–20 knots suits keelboat sailing; above 20 knots, treat the day as small-craft caution and check the National Weather Service for any active marine warning before sailing.

What wind speeds are best for diving in the Cayman Islands?

Calm conditions — sustained wind below about 10 knots (roughly 18 kph) with gentle swell — are generally considered favourable for shore and boat diving on Cayman’s leeward sites. Between 10 and 20 knots, conditions are workable on the lee side but uncomfortable on exposed coast. Above 20 knots, most operators relocate to sheltered sites or stand down for the day.

When is it unsafe to take a small boat out around Cayman?

Sustained winds above 20 knots (about 37 kph), or any active small-craft caution, marine warning or thunderstorm advisory issued by the Cayman Islands National Weather Service, are the standard signal to stay ashore in a small craft. Visibility below about 5 km in squalls or rain is another good reason to delay.

What is the best time of day for fishing in Cayman waters?

Most charter captains prefer the first and last few hours of daylight, when light wind, calmer seas and a feeding tide overlap. The "Sun & moon" panel above shows today’s sunrise and sunset; pair those with the wind reading for each location to plan a window.

How accurate is the marine forecast on this page?

Observations and forecasts come from WeatherAPI.com, which aggregates measurements from the Cayman Islands National Weather Service and downstream regional sources. Marine and overland conditions can differ on exposed reefs and headlands; treat this page as a planning reference and check VHF or the operator on the day.