Planning for the weather is a good way to make your trip to Batam relaxing and enjoyable, especially when you’re splurging. The hottest months are usually May and April with an average temp of 83°F, while the coldest months are January and February with an average of 81°F. The rainiest months in Batam are December, November, May, and January, with each month seeing an average of 13 inches of rainfall.