October in Okayama is the sunniest month of the year. In October, the weather in Okayama is typically warm. Average daily high temperature in October is about 21 degrees above zero. On average, Okayama has 15 sunny, 11 partly cloudy, 4 rainy, and 1 cloudy day in October. The rains are usually moderate. October as well as May is considered the most comfortable time to visit Okayama.