Monthly Key West water temperature chart
The bar chart below shows the average monthly sea temperatures at Key West over the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 21.8 | 21.8 | 22.9 | 25.4 | 27.0 | 28.5 | 29.7 | 30.5 | 29.7 | 28.2 | 25.8 | 23.6 |
| °F | 71.2 | 71.2 | 73.2 | 77.7 | 80.6 | 83.3 | 85.5 | 86.9 | 85.5 | 82.8 | 78.4 | 74.5 |
Monthly average max / min water temperatures
The graph below shows the range of monthly water temperatures over several years.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min °C | 19.8 | 19.5 | 20.3 | 23.5 | 24.8 | 27.1 | 28.3 | 29.3 | 28.7 | 26.3 | 23.8 | 22.2 |
| Max °C | 23.8 | 24.1 | 25.6 | 27.3 | 29.3 | 29.9 | 31.1 | 31.7 | 30.8 | 30.2 | 27.9 | 25 |
| Min °F | 69.2 | 68.9 | 70.6 | 75.8 | 78.4 | 81.9 | 84.1 | 85.7 | 84.5 | 80.9 | 76.4 | 73.1 |
| Max °F | 73.2 | 73.5 | 75.9 | 79.6 | 82.9 | 84.7 | 86.9 | 88.1 | 86.6 | 84.8 | 80.5 | 75.9 |