It's not unusual for temperatues to get down to 37 degrees farenheit here in Australia in winter. Our sugar gliders are outside and wild ones are living in the neighbourhood. There pouch is always nice and warm when you put your hand in it.
In summer it can easily get up to 109 degrees farenheit and again they seem to be able to tolerate this weather. Both ko and I try to do things like hose down the cage and branches and it was suggested to put a small pack of frozen peas in with them and this works fine, again in the wild they wouldn't have someone looking out for them.
Sugar gliders are much more resilient than you would think.