You 3 door or 5 door?
It has been raining a lot lately so there is a lot of damp in the atmosphere that you can't avoid, so it will happen.
If you've got any manual windows check that winder handles are pointed to the 6 oclock position or close by when the window is shut. I have known them manage to drop before now.
Make sure you keep your air conditioning turned ON even if you've got the heater on. That dries the air.
Also check the carpet under any floor mats you've got installed to make sure carpets aren't wet - which might indicate water ingress. Of course drivers side you might expect to be a little damp depending on usage with you getting in and out.
Sometimes it can be stupid things... My old Alfa 156, if left parked facing down hill during heavy rain, would leak water into the rear foot well. It would run down the back of the door, along the bottom of the door and into the footwell at the front side of the rear doors. If you left it parked facing up hill, no problem.