I'm like everybody else who says it should be fine. Wrap it up and you're good. It won't hurt a thing. The temperatures there won't be high enough to be an issue.
Maybe if you live in Arizona where the car temp with the windows up would be life threatening might be different. Or minus 10. I'd at least think twice about that. But you're in reasonable weather. No big deal.
I have a nice black G&L USA L 2500 that I paid decent money for. Shoot, you get on a gig facing the hot sun, 90 plus degree temps, high humidity etc. and that bass gets so hot you have to play it without touching the body. Man that thing gets hot. It doesn't hurt a thing.
Fast humidity and temperature changes are usually to be avoided. But if its in the case, wrapped, AND in a car, it's fine and I wouldn't worry about it.