August in Bordeaux is the sunniest and the warmest month of the year. In August, the weather in Bordeaux is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Bordeaux has 20 sunny, 9 partly cloudy, and 2 rainy days in August. The rains are usually light. August as well as July is considered the most comfortable time to visit Bordeaux.