I would not worry about it one way or another. If it rains often outside the car gets wet as well.
If the weather is dry, and the forecast is dry all day, leave it outside.
Keep in mind that all cars sold in North America are engineered for the RUST BELT in the Mid West. The Pacific North West is very gentle on cars, no excesive heat and hardly any salt.
When I wash my car, I do it before a shopping trip; the driving blows off any remaining water. If you rent a car in the Seattle or Vancouver area, they often smell musty inside, mainly because they are washed after every use and they're parked with the windows shut.