World sea water temperatures

Water temperature in Key West (FL) in May

Is it warm enough to swim in Key West in May? Average water temperature in Key West in May is 81.3°F and therefore suitable for comfortable swimming. The warmest sea in Key West in May is 86.9°F, and the coldest is 77°F. Average high air temperature in Key West in May is 85°F, and average low temperature is 76°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Key West

Changes water temperature in Key West in May 2025, 2024

To get an accurate forecast for the water temperature in Key West for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Key West, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
May 179.3°F80.4°F77°F80.6°F
May 279.5°F80.2°F77.4°F81°F
May 379.7°F80.8°F77.7°F82°F
May 480.4°F80.6°F77.9°F81.3°F
May 579.9°F80.8°F78.1°F81.5°F
May 680.6°F80.8°F78.1°F81.7°F
May 780.8°F81°F78.3°F82.2°F
May 880.6°F80.8°F78.6°F82.4°F
May 981.1°F81.5°F79°F82°F
May 1081°F82°F79.2°F82.8°F
May 1181.7°F82.6°F79.3°F82.9°F
May 1282°F82°F79.2°F82.6°F
May 1381.7°F82.2°F79.2°F82.6°F
May 1481.7°F82.9°F78.6°F83.1°F
May 1581.7°F83.5°F78.3°F83.8°F
Day 2025 2024 Min Max
May 1682.9°F83.7°F79.2°F84.7°F
May 1782.4°F83.8°F79.3°F84.4°F
May 1882.9°F83.7°F79.5°F84.6°F
May 1983.3°F83.7°F79.5°F84.4°F
May 2083.7°F82.9°F79.7°F84.2°F
May 2183.3°F84.6°F79.3°F84.6°F
May 2284.6°F84.7°F79.5°F84.7°F
May 2384.9°F84.7°F79.3°F84.9°F
May 2485.3°F85.3°F79.2°F85.3°F
May 2584.4°F84.7°F79°F84.7°F
May 2683.8°F85.5°F78.1°F85.5°F
May 2783.7°F85.1°F78.6°F85.1°F
May 2884.2°F85.8°F78.1°F85.8°F
May 2983.7°F85.5°F78.6°F85.5°F
May 3084.4°F86.9°F79.9°F86.9°F
May 3184.2°F86.2°F79.7°F86.2°F
Key West water temp chart in May

Average water temperature in Key West in May over a decade

20162017201820192020
81.5°F81°F79.3°F82°F81°F
20212022202320242025
81.1°F81.7°F82.4°F83.1°F82.4°F

Key West sea state in May

Chart comparing the height of waves in Key West in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Key West in May

Weather and climate in Key West in May

This data display average monthly climate indicators in Key West in May based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature85°F
  • Average LOW temperature76°F
  • Average humidity
    72
  • Average rainfall days7 days
  • Average rainfall107mm/4.2''
  • Average daylight13h
  • Average sunshine11h
  • Average UV index11

Key West water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in May?

Want to know where the water temperature in May is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Key West is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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