If you're looking for summer vibes, the best time to travel to Kailua - Kona, HI is in January, February and March, when the average temperature reaches 28.08 °C, while August, July and June are the 3 sunniest months of the year, with an average of 80.88 hours.
However, if you prefer colder temperatures, make sure you visit Kailua - Kona, HI during January, July or February to experience an average of 15.68 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, March and April, when the average precipitation in Kailua - Kona, HI is 8.25 mm, while the months of January, February and March are drier, with an average of 0 mm.