July, August, and September are the peak months, when the sun's heat evaporates an unusual amount of water, which becomes an ever-accumulating cloud formation. The earth's rotation influences their direction, as do weather patterns further north in the northern hemisphere.
颱風的形成有二項不可缺的要素：「熱」與「水氣」。在熱帶海洋，經太陽照射，水氣容易蒸發，升空凝結成雲，數量愈聚愈多，成為巨大積雲；加上受地球自轉方向的影響，整個雲團在北半球呈反時針方向旋轉，遂成一團不斷轉動的風雨。