There's no school June, July, and August, and there's school in September. That's a big factor as well.
You're missing my point.
School factors in very little in my point. School goes to about the 20th of June in New England before letting out for summer. However, what I said was WEEKENDS get very busy in June on the Cape. School doesn't factor into weekends in June, just like it doesn't factor into weekends in September (outside of kids sporting events for both periods).
July and August was never brought up and are irrelevant to my point.
June on Cape Cod is like November and December skiing in New England. The conditions really aren't that good, but it gets super busy and towards the end of June on the beach or December in the mountains, resorts charge HUGE money.
September on Cape Cod is like March / April in the mountains. The beach conditions are incredible in comparison to June, prices are way more affordable, but no one goes.
September weekends should be WAY busier on the Cape than they are in June, but that's just not the case. April weekends in ski country should be WAY busier than December. In both cases they aren't because people have moved on from those seasons.