I haven't had problems in our Hallmark popup, including camping in heavy rain on the Oregon coast in February. I do think inside/outside temp variation has a lot to do with it, similar temps means there's less of a cold surface to condense on. Type of construction has a lot to do with it to (composite vs. alum framed, i.e. thermal bridges) as does the pop up fabric. Of course, not boiling soup for a few hours can make a big difference too. Good ventilation is always key too.
While the PNW is known for it's wet gloomy weather, heavy humidity is not near as much of a problem as it is back east and in the south. Relative humidity is just that, relative. The amount of moisture at 80% rh at 70 degrees is much less than it is at 95 degrees. That warm moist air coming into a cooler space is going to drop that moisture somewhere.