Weather will likely play an important role when you plan your trip to Tinian, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 28°C, while the coldest months are February and March, with an average of 27°C. The rainiest months in Tinian are August, October, September and July, with each month seeing an average of 385 mm of rainfall.