April in Waikoloa is the cloudiest month of the year. In April, the weather in Waikoloa is typically warm. Average daily high temperature in April is about 21 degrees above zero. On average, Waikoloa has 16 partly cloudy, 8 cloudy, 4 sunny, and 2 rainy days in April. The rains are usually light. April as well as January, February, May, and June is considered the most comfortable time to visit Waikoloa.