Never noticed if it was worse after it rained. I do notice it in the evening when the temps drop there is a lot of accumulation on the inside of the windows. I don't put the car in the garage, so it's always outside. Nothing in the trunk except the things that came with the car. Don't use full auto. Here's the thing, I have another car, parked right in front of the Legacy and I don't have the same problem. When I had my '18 Impreza, it had the same problem, just less severe. I have no idea where all this moisture is coming from.