From my experience in placing orchids outside for the summer...the majority of mine have experienced a week or so of 35-40 temps...that being said, I wouldn't leave them out for months at a time in those temps, but once they are outside, if it comes a brief cold snap..mine stay out..all except phals, paphs and phrags...these never go outside..
Do your temps stay in the cold range long or is it just a few days ??? If just a few days , I wouldn't worry too much.
PS...I love cymbidiums... I had a huge Golden Elf(loved the lemon pledge fragrance) ,but they take up too much of my growing space !