Probably would need to know the specifics of the resins used in a specific guitar to understand the upper bounds on temperature. Carbon fiber is used in the braking systems of aircraft so CF in theory can take very high temperatures. My understanding is that even basic CF resins are good to north of 100°C. In practice I think this means a CF guitar could be put in the coldest or hottest surface conditions pretty much indefinitely. On board electronics might be an issue, if the turning machines have any plastic bushings maybe these could be an issue too, that's about all I can think of. We leave cars outside year round so surely overnight in the trunk of a car for even a few days would be harmless.
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