Yeah--those long range forecasts are mostly guesswork--in fact, the "short-range" forecast seems to be that way too. We were down there week of 9/20 to 9/27. The daily forecast by the local weather experts was "CHANCE" of rain each day. Some days a 40% chance, some days a 60% chance. That's not exactly pinpoint accuracy!!
And on Tuesday of that week, one of the local Orlando weather "experts" was on TV, wringing her hands and making a sad face, saying that if you wanted to get your swimming in, etc, better do it by Wed., as a front was coming and Orlando would be cloudy and rainy Thurs and Friday.
Well--no. Actually it was partly sunny--we swam each of those days. The whole week we had 3 thunderstorms, and all were over and done with in a hour or so.
Anyway--if you do get a long range forecast, I wouldn't put much stock in it.