I had the opposite happen once–5W-20 was put in the car instead of the specified 5W-30. It was in the winter when this happened. I didn’t think it would hurt anything. We even made a 700 mile road trip. I kept my eye on the oil level, but none was used. In your situation, I am certain that nothing bad will happen due to putting in 5W-30 oil. At your next oil change, just put in the 5W-20.