Yes, you can leave some types of tiki torches outside. Metal torches and solar-powered torches are designed to hold up against the elements. Glass torches won’t rust, but a strong storm can knock them over and break the glass. You should always bring the torches inside if possible during a strong rainstorm. This will ensure the torches last as long as possible. Wood and bamboo torches should never be left out in the rain or the material will crack and crumble.