Do you have your heart set on photos at the Arboretum? Or maybe you're getting married at Revolution Mill Studio and can't wait to have wedding photos taken on the railroad tracks. Do you have a rain plan? If it rains the night before, do you really want to drag the train of your white dress through the mud?
Think it through! Have an alternate location and communicate this to your planner (or coordinator) and your photographer.
Otherwise, be prepared to embrace the rain! (You may even prefer this option, rain does open up lots of great photo ops!)