Key West in May
Find out everything about the water temperature in Key West in May. Average, minimum and maximum recorded temperatures as well as daily temperature in May for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in May
Minimum:
77.8 °F
Average:
82.2 °F
Maximum:
90.0 °F
Sea water temperature in Key West in May
In the city of Key West, the month of May is a great time for swimming. The minimum recorded temperature during this month was 77.8°F on May 27, 2018, with an average temperature being 82.2°F and a maximum temperature reaching 90.0°F on May 31, 2024.
| Date | 10 years average | 2025 | 2024 |
|---|---|---|---|
| May 1 | 80.4°F | 79.2°F | 78.4°F |
| May 2 | 80.4°F | 79.2°F | 80.1°F |
| May 3 | 80.4°F | 79.7°F | 80.0°F |
| May 4 | 80.8°F | 79.5°F | 80.5°F |
| May 5 | 81.0°F | 80.9°F | 80.7°F |
| May 6 | 81.2°F | 80.1°F | 81.1°F |
| May 7 | 81.4°F | 82.1°F | 81.2°F |
| May 8 | 81.6°F | 82.2°F | 81.8°F |
| May 9 | 81.6°F | 82.6°F | 81.6°F |
| May 10 | 81.5°F | 82.6°F | 82.8°F |
| May 11 | 81.6°F | 82.6°F | 82.8°F |
| May 12 | 81.6°F | 82.7°F | 82.9°F |
| May 13 | 81.5°F | 82.2°F | 82.7°F |
| May 14 | 81.6°F | 82.1°F | 82.9°F |
| May 15 | 82.0°F | 82.6°F | 85.5°F |
| May 16 | 82.1°F | 82.7°F | 85.6°F |
| May 17 | 82.5°F | 84.4°F | 85.7°F |
| May 18 | 82.6°F | 83.3°F | 86.8°F |
| May 19 | 82.8°F | 85.0°F | 85.8°F |
| May 20 | 83.0°F | 85.3°F | 85.8°F |
| May 21 | 83.1°F | 85.9°F | 85.5°F |
| May 22 | 83.3°F | 84.5°F | 86.8°F |
| May 23 | 83.5°F | 85.7°F | 86.8°F |
| May 24 | 83.5°F | 86.9°F | 86.2°F |
| May 25 | 83.5°F | 86.8°F | 87.3°F |
| May 26 | 83.2°F | 86.1°F | 86.8°F |
| May 27 | 83.0°F | 86.4°F | 87.7°F |
| May 28 | 83.3°F | 85.8°F | 87.5°F |
| May 29 | 83.5°F | 86.4°F | 88.7°F |
| May 30 | 83.3°F | 85.3°F | 88.4°F |
| May 31 | 84.0°F | 86.4°F | 90.0°F |
In Key West, almost every month besides January is comfortable for swimming. Which amounts to 333 swimming days.
The warmest water in Key West was recorded on August 12, 2023, reaching a 91.4°F. While the coldest temperature occurred on January 26, 2025, dipping to 66.0°F. The average readings by season are 74.2°F in Winter, 79.1°F in Spring, 86.4°F in Summer, and 82.9°F in Autumn.
The average temperature in May is slightly warmer than April's average of 78.9°F. And in June, the temperature is expected to rise further, potentially reaching an average of 84.9°F.