I have an earlier version of the Seattle Sombrero, made of heavier fabric. It has worked better for me in rain, and I love the ventilation it provides. If the wind is up and moving rain sideways, nothing is going to keep you dry.

I always like to have a set of clothing reserved for wearing in my dry area- the tent interior or the cabin. I also keep a set reserved for walking in the rain; that set gets wet and stays wet, but if you are moving it is no problem.

Avoid cotton in damp conditions; it is worse than useless.

Hiking in the rain can be extremely interesting. Familiar landscapes look entirely different.