Monthly San Juan water temperature chart
The bar chart below shows the average monthly sea temperatures at San Juan over the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 21.9 | 22.2 | 21.1 | 19.4 | 18.6 | 17.6 | 16.0 | 15.6 | 15.6 | 16.4 | 17.9 | 19.9 |
| °F | 71.4 | 72 | 70 | 66.9 | 65.5 | 63.7 | 60.8 | 60.1 | 60.1 | 61.5 | 64.2 | 67.8 |
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 | 20.4 | 18 | 17.3 | 17.1 | 15.9 | 14.6 | 14.4 | 14.6 | 14.8 | 16.5 | 17.6 |
| Max °C | 24.9 | 24 | 24.2 | 21.6 | 20.2 | 19.3 | 17.5 | 16.8 | 16.7 | 18.1 | 19.4 | 22.2 |
| Min °F | 68.5 | 70.2 | 66.9 | 64.8 | 64 | 62 | 59.4 | 58.9 | 59.1 | 59.9 | 62.8 | 65.5 |
| Max °F | 74.4 | 73.8 | 73.1 | 69.1 | 67.1 | 65.4 | 62.3 | 61.3 | 61.2 | 63.2 | 65.7 | 70.1 |