between december and january the average high temp is about 72 but the temps can range from the low 60 s to the low 80 s. the overnight low is about 51 and sometimes gets a little chillier than that. you will want to bring a variety like a few pairs of pants and a few pairs of shorts and t-shirts. and bring a light jacket or hoodie for early mornings and later at night. and if you are going to theme parks definitely wear sneakers. oh and pack your bathing suit as well.
I go there every year in January, it s usually high seventies to low eighties. But some years there has been random cooler weather in the fifties.
There is no such thing as regular temps this time of year in Orlando. It could be 85 or it could be 35 or anywhere in between.
i live in orlando and earlier it was 82 in my house. i had to turn the ac on