m0useanswered grow question 6 months ago Rain on outdoor plants is normal and should be fine. If the plant is going to be stressed by rain and under-perform then you should not grow it again because its a little bitch lol.
Jokes aside it will be fine, I have let my auto go from seed to harvest outside before and they got rained on a lot, did fine. If you worried you can place a tarp over them or bring them inside. Clear plastic also works and lets light in still but have to remember to remove it and water them accordingly if you shielded them from all the rain.
One note on bringing plants inside from outside is pests. lots of things like to get into the soil and will come out when they are bring indoors. I had seen aphids and flays catch rides on plants when I do this.
Best Of Luck!