We visited Blizzard Beach last President's Week. It was 85 and sunny all week long, so the weather thing will really depend on well, the weather. You just can't predict what will happen. The day after we left, it poured rain for two or three straight days and was quite chilly.
Yes, TL is closed for next week. Interesting that it was also closed last year for President's Week. I always thought they tried to alternate closings year to year. Oh Well!
I did see that WDW is keeping the water temp a bit cooler than they had been before, I don't know how this will effect the water parks, but I don't like it for the resort pools at all! DH is going to have a fit!