Outdoor Speakers

Hi, I have a small place a block from the beach with a porch out front where we spend weekends in the Summer. My family spends a fair amount of time eating meals, reading, playing board games on the porch. I would like to install out door speakers so we (me) can listen to music. The porch is covered so they would not be exposed to the rain but the salt air does corrode just about everything very quickly. I think I would likely store them inside the house during the week for that reason. Are there any speakers that anyone can recommend? Thank you.