August in Tillamook is the warmest month of the year. In August, the weather in Tillamook is typically warm. Average daily high temperature in August is about 17 degrees above zero. On average, Tillamook has 15 sunny, 15 partly cloudy, and 1 rainy day in August. The rains are usually light. August as well as July is considered the most comfortable time to visit Tillamook.