Well, There is no distinct surfing season in Mui Ne. It depends on how you define it. Then yes or no surfing season in here! ))
However, I will show you some of info about this topic in this article.
There are two seasons in Mui ne that the South Wind and North Wind. This will affect to the way you surf.
In the south wind the beautiful to surfing in Mui Ne, Blue water, warm, nice waves (but not big)… This easy to surf for newbie.
In the storm day or raining day, the wave will bigger and good for pro surfers.
In the north wind the waves bigger, because the strong wind then make water floating and created the ugly waves. in the basically surfing in this season so tided and not fun. However there are big waves in these day at Mui Ne. You can find the small waves and good waves in morning of this season.
There are many places to surf in Mui ne for both seasons. you can change depend the waves conditions for each season.