We live here. Yes, the early mornings are cool (i.e. upper 50's/low 60's) but the day time temperatures are in the 80's.
A good source (well, as accurate as any weather forecast) is
www.weather.com. Enter Walt Disney World for the location to see what they
think the weather is going to be. Just keep in mind that this is
not accurate. Use it as a guide for what you might experience. None of us can do any better.