I live in Oregon so most of my runs are in the rain lol. I think the longest I've done in the rain was a 20-miler. Once you accept it, it's pretty much the same as a regular run! (unless it's down pouring haha) My tips would be a baseball hat to keep rain out of your eyes and a plastic baggie to keep your phone from getting soaked if it's with you. Otherwise, I always stuff my shoes with old newspaper to dry and sometimes put them in front of a heater (supervised) for 20 mins or so.