You need airflow in the tent and you need to air your bedding out in the sun around midday.
Most inexpensive tents are cheaply constructed and use small mesh windows to vent the tent. You have to be careful to set this up so the cross breeze will flow through the tent. I have a Bid Agnes Seedhouse that uses a "bathtub" nylon bottom and the top is all mesh. If you can find something constructed like this, it is far more forgiving at site placement and orientation.
Make sure the fly sits off the mesh/nylon by a couple inches and lets plenty of air move through. I take the fly off during the day and let the sun finish drying everything inside of the tent.
A big problem I see is that people don't use their guylines effectively, if at all. They should be taught and allow air to move between the tent and the fly.
If you know it is going to be wet, and you're car camping, you can sometimes be better off leaving the fly at home and bringing a big hardware store tarp and make a lean-to over your tent. It'll keep the rain off, allow air to move around the tent, and if you bring a big enough tarp, let you set up some camp chairs out of the rain. Make sure to hang the tarp high enough you can stand up straight. Nothing worse than being cold and damp, than being cold, damp, and feeling cramped.
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