Bali has a tropical climate and hence offers warm sea temperatures to go swimming. The water temperature at the surface around Bali is usually between 27°C and 30°C all year round. The coldest month is in July, and the warmest month is in January. Knowing what the water temperature will be at the time of your trip will help you determine if this is the best time to dive in Bali.
However, seasonal migrations of marine animals can sometimes have greater importance when a scuba diver decides to go diving in Bali. Scuba divers must note that the water temperature drops with depth and currents. For example, if we take water temperatures in Tulamben. In October, the surface temperature is, on average, 28°C; at 20 m deep, the temperature is 26°C. As a rule of thumb, you can estimate the water to be 1°C colder every 10 m.
There are some geographical differences, too, which affect the weather in Bali. The waters around Nusa Penida are colder than the average, while the water around Menjangan Island in the northwest is warmer than the average.
Bali average water temperature
You will find below, month by month, the average water temperature in Bali:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 29°C | 29°C | 29°C | 29°C | 29°C | 28°C | 27°C | 27°C | 27°C | 28°C | 29°C | 29°C |
Bali weather data source climatetotravels.com
Amed water temperature
You will find below, month by month, the average water temperature in Amed:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 29°C | 29°C | 29°C | 30°C | 30°C | 29°C | 28°C | 28°C | 27°C | 29°C | 30°C | 29°C |
Amed weather data source: climate-data.org
Nusa Lembongan water temperature
You will find below, month by month, the average water temperature in Nusa Lembongan:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 29°C | 29°C | 29°C | 29°C | 28°C | 28°C | 27°C | 26°C | 27°C | 27°C | 28°C | 29°C |
Nusa Lembongan weather data source: climate-data.org
Pemuteran (near Menjangan Island) water temperature
You will find below, month by month, the average water temperature in Pemuteran (near Menjangan Island):
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sept | Oct | Nov | Dec |
| 29°C | 29°C | 29°C | 29°C | 29°C | 28°C | 28°C | 27°C | 28°C | 28°C | 29°C | 29°C |
Pemuteran weather data source: climate-data.org
Other factors, of course, such as rainfall, which impacts the level of visibility underwater, must be taken into account. In this case, it is better to check Bali climate information.