What To Wear to Six Flags in 68 degree weather?

I'm going to Six Flags tomorrow with my sister, her boyfriend & my best friend. We're going to the one in Gurnee, Illinois but it's supposed to be partly cloudy with a high of 68; that's where I'm confused. I was planning on wearing shorts with a muscle tank from Victorias Secret but with it being 68 degrees, would I be too cold? Should I bring a light columbia jacket? & also, what to do with my iPhone since none of my pockets have buttons or zippers?
Any tips are appreciated!

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