August in Olympia is the warmest month of the year. In August, the weather in Olympia is typically warm. Average daily high temperature in August is about 24 degrees above zero. On average, Olympia has 22 sunny, 7 partly cloudy, 1 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 Olympia.