It gets warmer and more tropical the further south you go and the vegetation becomes lusher; you can see, feel and smell the difference. Hualien is always slightly cooler than Taitung, and anywhere in the mountains will be cooler than along the coast.
Unlike in the north, there are not afternoon showers every day in summer, which makes the area more suitable for outdoor activities. Mid-August to October is typhoon season and the east coast is frequently battered with severe storms. Winters are chilly and the pervasive dampness and overcast skies can make it seem much colder than the actual temperature. Don’t go to the east coast looking to swim in winter; head to Kenting instead.