Other that the rainy day, that sounds like IDEAL WDW weather to me!! I was there superbowl weekend last year and it was downright cold at night and it was AWESOME! I did have to buy some clothes because I really wasn't prepared, but that's the kind of sacrifice I am always willing to make
First, I don't like the extreme heat at all, and second, the "cold" scares away the locals. Floridians seem to go into hibernation if it goes below 70! It was a delightful 4 days!! It was a little rainy (not too much though) the day I got in and I pretty much had the Animal Kingdom to myself. Really! It was unbelievable there was no one around. I could have walked onto the safari over and over had I been so inclined. You know the room on Pangani with the naked mole rats? I usually hustle through there because it is always so stinkin' hot and crowded. That day, the heat in there was welcom and th building was EMPTY except for me and one CM. The night of the Super Bowl, I got to Epcot in the evening and walked onto Soarin'. The place was practically a ghost town! Oh, and speaking of the Super Bowl, kind of a cool story: I took the Keys to the Kingdom tour the day before and when they took us into the building where they prepare the parade floats, the tourguide got a kind of puzzled look on his face. He was looking at a couple of cars and said "I wonder what they're doing here?" Then he said "OH! They're for the parade on Monday, waiting to be decorated with the colors of the winning team!" I thought that was pretty cool, but totally steared clear of the MK on Monday!
Anyway, cooler weather can be your friend! Embrace it!!