Moisture Inside Cabin?

[Cboy1]

Tried to do a search but didn't find anything and thought I'd reach out to the community before taking it to the dealer. So I know it's been raining a lot the past few days here in SoCal, and everything has been fine until just now... I walk outta my office to find fog inside my glass and thinking to myself wtf...? The fog/moisture is primarily coming from the back glass area so initially I check the trunk lining/weather stripping and all that appears okay and even the outer glass molding appears to be fine... I didn't leave any doors open or any windows not closed, however I do have a habbit of driving a lot with the windows down even when it's sprinkling but I don't think that's enough to cause moisture issues... Anyone else have this problem or has it occured to them?