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３５°Ｓ以北的印度洋位于热带和副热带。北印度洋和印度次大陆及东南亚是全球最显著的季风气候区。北印度洋冬季为东北季风控制；但由于青藏高原阻断了冷空气，没有寒冷天气。夏季风在南亚和东南亚陆上主要表现为暴雨，在北印度洋上主要表现为强劲的西南风；特别是在阿拉伯海的索马里急流区，夏季经常有６～８级以上的西南大风。在春秋季的季风过渡季节，北印度洋时有台风发生，强风暴潮给孟加拉国造成极大的灾难。在南印度洋的副热带，全年都有副热带高压控制。南印度洋热带海区则为信风气候区，夏半年热带辐合带活跃，东西两部分都有台风发生发展，强西南季风和台风是海上航行的主要灾害性天气。
The Indian Ocean north of 35 ° S is located in the tropics and subtropics. The North Indian Ocean and the Indian subcontinent and Southeast Asia are the most prominent monsoon climates in the world. The North Indian Ocean is controlled by the northeast monsoon in winter; however, there is no cold weather due to the blockage of cold air in the Tibetan Plateau. The summer monsoon is mainly characterized by heavy rainfall on land in South and Southeast Asia and mainly by the strong southwest wind in the North Indian Ocean. Especially in the Somali Rapids area in the Arabian Sea, the southwest gales with magnitude of 6 to 8 are often in summer. During the monsoon transitional season in spring and autumn, typhoon occurred in the northern Indian Ocean. The strong storm surges caused great disaster in Bangladesh. In the subtropical South Indian Ocean, subtropical highs are controlled throughout the year. In the tropical South Indian Ocean region, there is a credible climatic zone. During the summer half year, the tropical convergence zone is active. Typhoon occurs in both east and west. Strong southwest monsoon and typhoon are the major disastrous weather for sea voyage.