都是对的，如果是第一种说法，那强调的是天气，如果是第二种说法，强调的是潮湿，综合来讲还是第一种符合你的说法

潮湿(的) is a noun and adjective . 这是一个 潮湿（的）天气 It is a wet weather. 天气潮湿 The weather is wet.

潮湿天气 damp weather 天气潮湿 the weather is damp we usually say "潮湿的天气"

For "wet weather", it should be 潮湿的天气。 “潮湿天气” sounds weird. And "天气潮湿" is "the weather is wet". It is not a noun phrase.

I hate the [ wet waether ] (潮湿天气) The [ weather is wet ] (天气潮湿)