Weather will likely play an important role when you plan your trip to Ambon, 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 82°F, while the coldest months are August and July with an average of 79°F. The rainiest months in Ambon are May, June, July, and April, with each month seeing an average of 14 inches of rainfall.