January in Waikoloa is the sunniest month of the year. In January, the weather in Waikoloa is typically warm. Average daily high temperature in January is about 21 degrees above zero. On average, Waikoloa has 15 partly cloudy, 12 sunny, 3 cloudy, and 1 rainy day in January. January as well as February, April, May, and June is considered the most comfortable time to visit Waikoloa.