A lot of factors influence the water temperature in seas such as ocean currents, winds, coastal rivers, climate of the surrounding territory, and natural barriers. However, the main factor is the location. 

The warmest seas are located near the equator in the Indian Ocean. The waters of this ocean are surrounded by sun-heated land and protected from cold ocean currents. 

Red Sea

The Red Sea is a part of the Indian Ocean. It washes eight countries located on the Arabian Peninsula and the African continent, including such popular tourist destinations as Egypt, Jordan, and Israel. This is the warmest and saltiest sea on our planet that heats up to +35 ºC (and sometimes up to +38 ºC), never dropping below + 18 or +20 ºC.

Many travelers come to this seashore in the winter, enjoying not only its warm waters, but also the crystal-clear subterranean depths, as well as the unusually rich and diverse underwater flora and fauna. This is an ideal place for diving, fishing and taking photos.

Arabian Sea

The Arabian Sea is located in the northern part of the Indian Ocean, and gulfs connect it with the Red Sea and the Persian Gulf. It washes the territory of Somalia and the Arabian Peninsula in the west, India in the north and northeast, and the Maldives in the east. This is one of the most salty seas in the world due to intensive evaporation.

Here, the water temperature in summer reaches + 29 ... + 31 ºC and in winter it is + 21 ... + 22 ºC in the north-eastern part of the water area. The monsoon climate with periodic gusty winds prevails.

Timor Sea

The Timor Sea washes the coastal zone of several states: the Philippines, Indonesia, Brunei, and the Indochina Peninsula. The sea is considered to be quite shallow, but it has a seismically active trough, the Timor Trough, which is 3.3 thousand meters in depth. 

Though the temperature of the local waters may reach +31 ºC, the geographical location, the difficult topography of the seabed and almost unobstructed water flow in the Indian Ocean make the local climate very changeable. The water temperature in some places can be rather low. 

Andaman Sea

The tropical waters of the Andaman Sea wash the shores of Myanmar in the north, Thailand and Malaysia in the east, and Indonesia in the south.

The temperature of sea water in the summer period ranges from + 30 to + 32 ºC. It remains warm even in winter, sliding not lower than +23 ºC. A large number of rivers flow into the Andaman Sea. Its water is not too salty, which forms a unique flora and fauna in its depths. In addition, the Andaman Sea is a combination of the key transportation hub in the region and one of the most popular tourist destinations in the world.

Persian Gulf

The waters of the Persian Gulf first pass through the Strait of Hormuz into the Gulf of Oman, then into the Arabian Sea and only then it flows into the Indian Ocean. Therefore, this water body can rightly be called a sea. The water in this gulf is not as salty as in the Red Sea since several rivers flow into it.

The relatively shallow depth of about 100 meters makes it possible for the water to warm up to almost +36 ºC in the summer and to +18 ºC in the winter. In addition, almost the entire water area is surrounded by the land of such hot countries as the United Arab Emirates, Iran, Qatar, Bahrain, and others.