adjust. i take two rifles if going on a hunt where it might rain. one scope and one with peeps. be aware that deer as well as you will move quieter. that is if you move.
if hunting from a stand, they won't change habits too much, if anything will feed longer before bedding down.
besides, being in the woods in the rain, if it isn't a downpour, isn't a bad experience in itself. if it rains, you will also have less competition if you are on public land.
