A thin sweater is enough for you if you plan to remain indoors, but bring a thick coat if you go outside, especially if you want to see the sunrise since the early mornings are cold. Since April sees a lot of rain, bring a raincoat.
The coming of the spring brings green trees as well as various flowers all over the mountains and plains, making for gorgeous scenery. What's more, be sure to see the sunrise from the sea of clouds, as it is quite a visual feast. See our Huangshan Tours.