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Does rain cause rust on cars?

I live in Seattle, but I’ve been out of town for about three months. It just occurred to me that I left my car on the street instead of in the garage. It’s been raining non-stop back home. Is there a danger of my car becoming rusted?

avatar
Patrick Price · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Unfortunately, the answer is yes—rain does cause rust on cars and there is a real possibility that you’ll return to find rust on your car.
As you may know, rust is simply oxidized iron. Virtually every car on earth is absolutely riddled with iron. More specifically, they are made with steel—which is an alloy of iron mixed with carbon. This mixture makes steel stronger than pure iron, but it also makes it rust easier.
Steel is incorporated into your car’s chassis, body, roof, doors, frame, and (in some cases) mixed into the car’s paint. This means rust can grow on virtually every inch of your car—inside and out.
Normally it takes a long time for a car to rust since the speed of its movement will dry it out pretty effectively, even after it rains. If your car has been sitting stationary for three months, and has been getting rained on regularly for that entire time, then there’s a good chance rust may have developed.
Rust can be hard to eradicate on your car. And it’s just one of the many threats your car faces every day! To keep your investment protected, you should make sure that your auto insurance is up to snuff!
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