If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Punaluu: The hottest months are usually August and July with an average temp of 70°F, while the coldest months are January and February with an average of 65°F. The rainiest months in Punaluu are August, July, September, and June, with each month seeing an average of 17 inches of rainfall.