Дождевой - свойственный дождю Дождевая вода, Дождевые черви, Дождевые грибы, Дождевые тучи, потоки Дождевой навес, сток, плащ Дождливый - отличающийся обилием дождей; с частыми, непрерывными дождями Дождливая погода, Дождливое лето, Дождливая улица (залита дождем) Может быть и такое === дождевая пора — пора, в которую выпадают дожди; дождливая пора — пора, обильная дождями.

It's a little bit difficult to explain. We use "дождевой" when we talk about thing which are caused by rain. For example, "дождевой плащ" - raincoat. "Дождливый" is about the weather. "Дождливый день" means "a rainy day"

Дождливый is something like rainful Дождливый день - a rainful day, дождливое лето - a rainful summer. And дождевой is simply somehow related to rain.

many people will be at me for giving this suggestion but from my international experience that's the best way to learn any language. In Russian language (like in any other) there are many words meaning basically the same thing. The difference is so subtle that it's not worth the efforts to learn them (well at least at the beginning). Focus on the vocabulary and learn as many different words as possible + a bit of grammar (only at bit!) will help you along. In this regard, both words mean the same to me and if you would use any of them, I would understand you. Goof luck!