Dream, if it's just lightly raining, I still let my chickens out, as long as they have a place to go to get dry. The pop door is open, and you have a half covered run and you have the area under your coop. Chickens would love to go and dust bathe. Chickens sure don't like being cooped up. And, on hot days, they don't seem to be bothered by the light rain.
Have a great day, all
Have a great day, all