If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Ambon: The hottest months are usually January and December, with an average temperature of 28°C, while the coldest months are August and July, with an average of 26°C. The rainiest months in Ambon are May, June, July and April, with each month seeing an average of 350 mm of rainfall.