Our family went to Disney two years ago. We went the week of January 11th.
I have to admit I was a little nervous about the weather this time of the year because I know the temperatures go up and down.

Not that we could complain about the temperature in Florida because we flew out of Detroit on January 10th and it was 2 degrees!!

I'm happy to report when we landed in Orlando, it was about 2:00 in the afternoon and it was 78 degrees and sunny!

Besides the day we landed, the temperature never dipped below 80 degrees!!

I packed for everything, but I can tell you that we did where hooded sweatshirts at night (with our shorts!!) because it got a little cooler at night.
The day we flew home, it poured rain (the only rainy day of our trip).

It made leaving Disney seem not so sad.... because none of us wanted to leave, as it was our first trip.
Hope this helps and have a fun, fun time!!