These figures are calculated from several years of recorded data and are the maximum, minimum and average temperatures of all the recorded years
The bar chart below shows the average monthly sea temperatures at Hạ Long over the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 19.3 | 19.3 | 19.9 | 22.4 | 27.3 | 29.3 | 30.7 | 30.1 | 29.2 | 26.9 | 24.8 | 21.6 |
| °F | 66.7 | 66.7 | 67.8 | 72.3 | 81.1 | 84.7 | 87.3 | 86.2 | 84.6 | 80.4 | 76.6 | 70.9 |
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 | 17.9 | 17.4 | 17.6 | 18.8 | 24.1 | 27.7 | 29.3 | 29.1 | 27.1 | 24.7 | 23.2 | 18.9 |
| Max °C | 20.7 | 21.2 | 22.2 | 26 | 30.5 | 31 | 32.2 | 31.2 | 31.4 | 29.1 | 26.5 | 24.3 |
| Min °F | 65.3 | 64.8 | 65.5 | 68.7 | 77.9 | 83.1 | 85.9 | 85.2 | 82.5 | 78.2 | 75 | 68.2 |
| Max °F | 68.1 | 68.6 | 70.1 | 75.9 | 84.3 | 86.4 | 88.8 | 87.3 | 86.8 | 82.6 | 78.3 | 73.6 |