Forecasting 15 days out, especially in Florida’s winter, is a crap shoot at best.
I’ve started tracking the 10 day forecasts for trips planning one type of weather only to have the picture firm up and change so many times that days that were originally expected to be sunny and warm became cold and wet while I’ve also seen nights that were supposed to be complete wash outs 10 days out become clear and balmy breezes 2 days before.
What I’m saying is, use the extended forecast as a guide, but still pack for anything.
I’ve lived in Florida for 25 years now and I’ve seen everything in February, short of snow and ice. I’ve seen highs in the upper 80’s and lows in the low 30’s. There is no rhyme or reason, other than to suggest you also look at the national picture and see what storms are coming on shore in the Pacific and what Arctic blasts are heading in from Canada. The more powerful they are, the more affect it will have on Orlando.