Grand Cayman Sea Temperature

Looking to find out what the sea water temperature in Grand Cayman is for today and the next few days? Below are data and charts that will give you information about sea temperatures in Grand Cayman and nearby locations.

Water temperature in Grand Cayman right now

Below is the current sea temperature for Grand Cayman, Cayman Islands on 29th March 2024.

27.56° C

(81.61° F)

  • yesterday: 27.43° C (81.37° F)
  • a week ago: 27.66° C (81.79° F)

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

The average sea temperature for Grand Cayman on March 29th over the last 10 years is 26.98° C (80.57° F), with a low temperature of 25.65° C (78.17° F) and a high of 27.61° C (81.7° F).

Analysis and forecast for Grand Cayman water temperatures

The water temperature in Grand Cayman today is higher than the average temperature of 26.98° C (80.57° F) and the temperature on this day last year, 29th March 2023, was 27.54° C (81.57° F).

The chart and table below shows the change in water temperature in Grand Cayman over the last 30 days:

Date Temperature (Celsius) Temperature (Fahrenheit)
March 29 27.56° C 81.61° F
March 28 27.43° C 81.37° F
March 27 27.72° C 81.9° F
March 26 27.62° C 81.72° F
March 25 27.62° C 81.72° F
March 24 27.66° C 81.79° F
March 23 27.63° C 81.73° F
March 22 27.66° C 81.79° F
March 21 27.84° C 82.11° F
March 20 27.7° C 81.86° F
March 19 27.71° C 81.88° F
March 18 27.78° C 82° F
March 17 27.76° C 81.97° F
March 16 27.74° C 81.93° F
March 15 27.66° C 81.79° F
March 14 27.74° C 81.93° F
March 13 27.75° C 81.95° F
March 12 27.61° C 81.7° F
March 11 27.58° C 81.64° F
March 10 27.45° C 81.41° F
March 9 27.32° C 81.18° F
March 8 27.24° C 81.03° F
March 7 27.14° C 80.85° F
March 6 27.19° C 80.94° F
March 5 27.14° C 80.85° F
March 4 27.04° C 80.67° F
March 3 26.98° C 80.56° F
March 2 26.92° C 80.46° F
March 1 26.9° C 80.42° F
February 29 26.89° C 80.4° F
February 28 26.87° C 80.37° F

The actual nearshore temperatures may vary by several degrees and this can also be heavily affected by weather. Strong winds can cause cold, deep waters to replace the surface waters that had been warmed by the sun, and heavy rain can also reduce the temperature of the sea surface temperature as well.

Water temperature in Grand Cayman by month

The chart below shows the monthly average water temperature in Grand Cayman.

For more detailed information on how the sea temperature in Grand Cayman changes for each month of the year, choose from the months below.

Grand Cayman map and nearby water temperatures

Locations near Grand Cayman

The highest temperature in Cayman Islands today is 27.13° C (80.83° F) in East End. The lowest is in Cayman Brac, where the temperature of the water is 27.03° C (80.65° F).

Why measure sea surface temperatures (SST) in Grand Cayman?

The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as Grand Cayman because they want to understand and learn how the ocean communicates with the atomosphere of Earth.

SST is one measure that provides information on the global climate, and it can be used to predict the weather in Grand Cayman as well as atmospheric model simulations and to study marine ecosystems in the area.

Data source and citation

Raw data for the calculations made to find the sea surface temperature in Grand Cayman comes from the National Oceanic and Atmospheric Administration (NOAA) and their 1/4° daily Optimum Interpolation Sea Surface Temperature.

The water temperature data is constructed by combining observations from different platforms (satellites, ships, buoys, and Argo floats) on a regular global grid. A spatially complete sea surface temperature map is then built by interpolating to fill in gaps in the data.

If you'd like to use any of the information above in the format it is presented, please use the citation tool below.

  • "Grand Cayman Sea Temperature". SeaTemperatures.net. Accessed on March 29, 2024. http://seatemperatures.net/central-america-and-the-caribbean/cayman-islands/grand-cayman/.

  • "Grand Cayman Sea Temperature". SeaTemperatures.net, http://seatemperatures.net/central-america-and-the-caribbean/cayman-islands/grand-cayman/. Accessed 29 March, 2024

  • Grand Cayman Sea Temperature. SeaTemperatures.net. Retrieved from http://seatemperatures.net/central-america-and-the-caribbean/cayman-islands/grand-cayman/.