Java Sea Water Temperature Today & Regional Overview
We find every place where you can swim and show you the water temperature there today and throughout the year.
Current Water Temperature
The water temperature in the Java Sea today ranges from 27.6°C (Banyuwangi, Indonesia) to 30.1°C (Tegal, Indonesia).
As of today, the minimum water temperature in the Java Sea ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Sea Temperature Trends
Over the past month, the water temperature in the Java Sea has remained almost unchanged. In general, the sea water temperature remains within the statistical range for this time of year.
Water Temperature and Swimming Conditions Throughout the Year
| Month | Min | Max |
|---|---|---|
| January | 26°C | 32°C |
| February | 27°C | 32°C |
| March | 27°C | 32°C |
| April | 28°C | 32°C |
| May | 26°C | 32°C |
| June | 26°C | 32°C |
| July | 23°C | 31°C |
| August | 23°C | 31°C |
| September | 23°C | 31°C |
| October | 24°C | 32°C |
| November | 25°C | 32°C |
| December | 26°C | 32°C |
The Java Sea lies in the tropical waters between the Indonesian islands and maintains warm temperatures throughout the year. Surface water temperatures typically range from about 26°C to 30°C, with average values near 28–29°C. Seasonal variation is relatively modest: the coolest months tend to be during the southeast monsoon around June to August when sea surface temperatures commonly drop toward 26–27°C, while the warmest period is often in the months just before and after the northwest monsoon, roughly February to April, when temperatures can reach 29–30°C. Short-term fluctuations also occur with tides, currents, and local upwelling, but large departures from this band are uncommon in the Java Sea’s sheltered, low-latitude setting.
Swimming Conditions
Swimming in the Java Sea is generally possible and comfortable from a temperature standpoint because waters remain pleasantly warm year-round. However, whether swimming is advisable in any given spot depends on local conditions. Many coastal resorts and islands offer safe swimming areas with gentle waves, but parts of the sea are busy shipping lanes, have strong tidal currents, or suffer from water quality issues near ports and urban runoff, making swimming hazardous or discouraged. Seasonal monsoons can produce rougher seas and stronger currents, reducing safe opportunities during certain months. Visitors should follow local signage and advice, choose monitored beaches or resort areas, and be mindful of boat traffic, currents, and potential pollution despite the generally warm and inviting temperatures.