Keep these two rating in mind when buying a rain jacket. In down-pour rains, you’ll want a jacket that has a high waterproof raining to prevent from getting soaked. While in windy or cool conditions, maybe you don’t need a high waterproof rating. In warm and humid conditions, a rain jacket that breathes is an absolute necessity. For example, the afternoon summer showers in Florida can soak you, but if you’re not wearing a breathable rain jacket, your sweat will soak you from inside the jacket.