The weather will be WARM!!!
Don't forget to visit Universal Studios and Islands of Adventure (in the same park) they are awesome! I love Epcot Center which is Disney and I would like to go to Animal Kingdom someday but as for Magic Kingdom, I haven't been there in 17 years. I have no desire to go there since I have no kids and I think its geared more towards kids, but you should have a blast at all the parks.... they are all fun!
Have a GREAT trip! My longest car ride was from MASS to Myrtle Beach SC, it was 16 hours, We just cranked the radio and put the windows down, opened the sunroof and talked, laughed, joked, enjoyed the weather. It went pretty quick, esp the night hours.