April to May and October to December are the two best windows for visiting Taiwan. Between April and May, the weather is warm and not at all humid, making it conducive for travelling around. Another reason is that the festival of the goddess Mazu's birthday falls in spring, on a date that shifts each year, and this is a great time to be in Taiwan. From October onwards the summer humidity drops away and the days stay comfortably warm, though the north sees showers as the northeast monsoon sets in.