August in Bora-Bora is the sunniest and the coldest month of the year. In August, the weather in Bora-Bora is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Bora-Bora has 22 sunny, 6 partly cloudy, and 3 rainy days in August. The rains are usually light. August as well as September is considered the most comfortable time to visit Bora-Bora.