是rainy，因为rain不是重读闭音节。Sometimes it's rainy in summer.

夏天有时会下雨。

They take a walk on rainy day.

他们在下雨天散步。

I will not come on a rainy day.

我不会在雨天来。I'm not used to the rainyseason in the south.

我不太适应南方地区的多雨季节。