I'm kind of amazed at how quickly the weather can change. You can't even trust the forecasts a few days out.
A few years ago we were at Typhoon Lagoon in March. The whole week was forecast to be sunny with highs of about 75-81. It was a hot and bright day, the kind that will give me a sunburn very quickly even at 10:00am. But sometime by 1:30pm, after a brief rain, the skies were cloudy and the winds were gusty. While the water was still heated and well-regulated, once getting out, it felt a bit uncomfortably cold to walk around without a shirt and we ended up leaving to eat. But by 3:00pm that afternoon, it was really hot again.