Taiwan’s subtropical climate means that it experiences short lived and relatively mild winters (though it’s common to see a snow tipped mountain or two at the height of the season) and wet, humid summers. As one might expect, the north tends to be a few degrees colder than the rest of the country and typically much wetter. The northern monsoon season lasts from October to March and mainly affects the east side of the island – leaving the central and southern regions relatively dry, while the southern monsoon season generally lasts around 4 months from May to September and is at its worst towards the end of the season when typhoons hit the east coast and the central mountain range.
Average temperatures are between 15 to 20°C in the winter months and 25 to 35°C in the summer. If you plan on visiting the north of the country – in particular the higher elevations of the mountains – then the most pleasant time to visit is the early summer (May to July) when temperatures are quite tolerable, and hot along the southern coastlines – which is perfect if you intend to do a little sunbathing or some water sports.