Planning for the weather is a good way to make your trip to Kokopo relaxing and enjoyable, especially when you're splurging. The hottest months are usually May and October, with an average temperature of 27°C, while the coldest months are August and September, with an average of 27°C. The rainiest months in Kokopo are March, April, December and February, with each month seeing an average of 415 mm of rainfall.