Your question about the weather in Boston and the best time to travel (for warm weather) is a bit iffy.

As they say in New England... "If you don't like the weather here, wait 5 minutes and it will change." This is true - and after this spring with a month of cold and rain during May, I would recommend June. It should be warm and it maybe hot, but the sticky, horrid weather of summer probably (?) won't get here until the later part of that month or July.

July and August on the Cape can be beautiful, but there will be wall to wall people.

Good luck. Susie Newton MA