There's nothing like an all-inclusive vacation in Samaná to rejuvenate you, especially when you know what kind of weather to expect. Here's some info to help you choose when to book: The hottest months are usually August and September with an average temp of 70°F, while the coldest months are January and December with an average of 68°F. July and January are the driest months while October and November are the rainiest months.