[Chris in WNC]

closed car?
unless there's something seriously wrong with the top fabric, a few days outside will be no problem.
I usually keep ours outside Friday-Sunday as it is easier than squeezing it into my basement garage at the rear of the house.
Had some short hard Florida-style showers last week but all stayed dry inside.
Open car? no worries, they are designed to get wet :-)

I once had a California car cover for a Tudor but sold it after a couple years.
If you drive frequently, putting it on and off gets old very quickly.....