I've left my scope on its mount outside for about a week in a row (early-mid May when the seeing was so good and I was out every night).
It got very wet with dew every night so I didn't seem to notice any problems during the day? I'm not sure if i'd leave it out like that during 30+ deg hot summer days but during the cooler months it's probably fine.
I use a motorcycle weather cover, which apparently "breathes" so you won't get the problems described by Leon. Problem is, it's not exactly heavy duty and doesn't completely cover my scope + mount so i'm not sure if it would cover yours.
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