Java Sea Water Temperature Today & Regional Overview

Current Water Temperature

The water temperature in the Java Sea today ranges from 28.1°C (Banyuwangi, Indonesia) to 30.4°C (Tegal, Indonesia).

As of today, the minimum water temperature in the Java Sea is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating.

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.

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.

Popular Resorts with the Warmest Water Today