Key West Sea Temperature

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

Analysis and forecast for Key West water temperatures

The water temperature in Key West today is higher than the average temperature of 27.36° C (81.24° F) and the temperature on this day last year, 19th May 2023, was 28.57° C (83.43° F).

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

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 Key West by month

The chart below shows the monthly average water temperature in Key West.

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

Key West map and nearby water temperatures

Locations near Key West

Fort Zachary Taylor

United States, North America

2.00 miles away

Stock Island

United States, North America

2.77 miles away

Big Coppitt Key

United States, North America

8.06 miles away

Sugarloaf Key

United States, North America

15.63 miles away

Cudjoe Key

United States, North America

19.43 miles away

Marquesas Keys

United States, North America

20.37 miles away

The highest temperature in United States today is 27.95° C (82.3° F) in Big Coppitt Key. The lowest is in Barrow, where the temperature of the water is -1.63° C (29.06° F).

Why measure sea surface temperatures (SST) in Key West?

The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as Key West 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 Key West 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 Key West 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.