August in Burnaby is the warmest month of the year. In August, the weather in Burnaby is typically warm. Average daily high temperature in August is about 20 degrees above zero. On average, Burnaby has 19 sunny, 8 partly cloudy, 3 rainy, and 1 cloudy day in August. The rains are usually light. August as well as July is considered the most comfortable time to visit Burnaby.