June in Oyama is the cloudiest month of the year. In June, the weather in Oyama is typically warm. Average daily high temperature in June is about 24 degrees above zero. On average, Oyama has 17 rainy, 7 cloudy, 3 sunny, and 3 partly cloudy days in June. The rains are usually heavy. June as well as February, July, and August is considered the most uncomfortable time to visit Oyama.