Weather will likely play an important role when you plan your trip to Coconut Island, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and December with an average temp of 81°F, while the coldest months are August and July with an average of 78°F. The rainiest months in Coconut Island are March, May, April, and February, with each month seeing an average of 15 inches of rainfall.