If you have your poncho with you (large enough to cover your backpack) and it’s a light rain, you can keep on hiking, unless it is a steep incline. Of course, lightning is a different story. In that case, take cover and wait it out. When you’re planning where to put your tent at night, make sure to not make it at the bottom of a hill, where all the water will run down to. If it starts to get cold, use your hand warmers to heat yourself up until you can light a fire. As soon as the rain lets up, try to get dry as fast as possible to minimize discomfort.