Geez Maura, I never think about these things, I just put them outside when I have the deck ready - which is late this year for me. I just finished painting on the water seal on the deck railings at 9AM. I'm going to power wash the deck on Sunday and Monday, including the balusters. Then if doesn't rain for 3 days next week I'll apply the water seal to the balusters. Once that's all done the orchids finally go out. Temp's are predicted for low 90's by then.
Perhaps you could put them out in the evening so that they can warm up with the day the next morning. Hang the shade cloth in the morning. They are going to love the humidity. I don't think the thunderstorms will hurt them, has that happened in the past? - martha