We have gone that time of year for the past 6-7 years. It is over Columbus Day, so it will be busy like a 5-7 crowd level, many kids have off from school. Try to stay away from Epcot on the weekend, especially in the evening, we have avoided it unless we have dinner reservations. We have always had hot weather in the 80's and humid and one trip it rained every day, but usually we've had 1 or two days with rain.
We followed crowd predictions and plan with the recommended parks and have always had success. After seeing crowds last year we moved to be there the first week of October, but your time is still better than going in summer/x-mas/Easter!