June in Kailua-Kona is the windiest and the cloudiest month of the year. In June, the weather in Kailua-Kona is typically warm. Average daily high temperature in June is about 23 degrees above zero. On average, Kailua-Kona has 30 rainy days in June. The rains are usually heavy. June as well as January, February, March, and April is considered the most uncomfortable time to visit Kailua-Kona.