I really really enjoy the first week of June. Its a little over cast until noon but then the sun comes out and it gets really really warm but is totally bareable. Put on some sunscreen and away you go. You can wear shorts and tshirts all day. Go on water rides, get soaked and you dry out in 20 minutes. Come the evening you will need a lighter jacket but the weather is still really nice. This past june I found it to be quite warm in the evenings and went without a jacket several times, but I brought one anyways just in case.