rain weather的意思是下雨的天气，而rainy weather是“雨季”的意思，都对的。
1、rainy weather 英[?reini ?we] 美[?reni ?w?]
[词典] 雨季;
[例句]Rainy weather brings blessed relief to hay fever victims.
雨天会给枯草热患者带来欣喜，减轻他们的痛苦。
2、rain weather：下雨的天气
[例句]The rain weather is been really disconsolate the person!
阴雨的天气真叫人惆怅！