Grand Cayman Sea Temperature

Cayman Islands · Forecast updated Jul 15, 2026, 06:21 UTC · refresh delayed

Current Sea Temperature

29.9°C

85.8°F

Very warm water

Versus this month's average

Close to average

The July average in our archive is 30.0°C (85.9°F).

Recent trend

Holding fairly steady

Seven-day average: 29.9°C, versus 30.1°C in the prior seven days.

What to wear

Very warm water

Swimwear is usually enough; a rash guard adds sun protection.

Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not mean the sea is safe.

Sea Surface Temperature Over the Year

In the data collected for Grand Cayman, monthly averages range from about 29.5°C (85.0°F) in June to 30.0°C (85.9°F) in July.

Over the past 30 days, the average sea temperature in Grand Cayman has been 29.8°C.

Month	Min	Average	Max
June	28.9°C / 84.0°F	29.5°C / 85.0°F	30.1°C / 86.2°F
July	29.6°C / 85.3°F	30.0°C / 85.9°F	30.4°C / 86.7°F

Profile calculated from 1071 hourly forecast records across 2 monthly periods. This is a growing archive, not a long-term climate normal.

Home to Stingray City and the shallow coral gardens of the North Sound.

The current sea surface temperature in Grand Cayman is 29.9°C. Over the last 30 days, the average has been 29.8°C.

The warmest monthly average in the Grand Cayman archive is July, at around 30.0°C (85.9°F).

The coldest monthly average in the archive is June, at around 29.5°C (85.0°F).

Yes — at 29.9°C the water is warm enough for comfortable swimming and snorkeling.

See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Grand Cayman.