Got the car sealed and ready to shoot base and clear. Now we have this weird thunder storm crap coming in and it's already pretty humid in my garage booth with the hot lights and wet floor.

Any adjustments I need to make? What differences will this make?

Unless you are shooting a waterborne product humidity really makes little difference. Your flash times might be extended a couple of minutes if the ambient air is so saturated that the solvents out-gas slower but it'll most likely be unnoticeable.

Chris is right. also watch for condensation, sometimes it will be just on the lower part of the body. depends on were warm humid air meets cooler air or metal.
Jay D.