| I think many orchids can handle 10C (50F) for a short period of time. If it is going to be a prolonged exposure ( like the onset of fall/winter I think it will be better to bring them inside when the temp. drops to about 12C(54F).
This is not my experience and I am hardly an expert. But this what I gathered over the last few months.
I plan to bring all of mine indoor at the middle of oct. when the outside temp. may be around 15C (59F), as kmarch suggested.
Some may require 'acclimatization'. I try to bring some of them indoors at nights. It is a hard work.
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