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 temperature of 28°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Batam are December, November, May and January, with each month seeing an average of 319 mm of rainfall.