August in Oban is the rainiest and the warmest month of the year. In August, the weather in Oban is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Oban has 22 rainy, 4 partly cloudy, 3 cloudy, and 2 sunny days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Oban.