If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Kokopo: The hottest months are usually May and October with an average temp of 81°F, while the coldest months are August and September with an average of 80°F. The rainiest months in Kokopo are March, April, December, and February, with each month seeing an average of 16 inches of rainfall.