Hello, Francisca! Welcome to the Disney Parks Moms Panel and thanks for your question.
I personally think the weather at the Disneyland Resort is pretty perfect year-round. While you will certainly want to check the forecast a few days before you actually visit, you can expect average temperatures ranging from the 50s to the 70s. The mornings and evenings will definitely be cool so bring along a light jacket or a sweatshirt. The days may end up being warm enough to wear your shorts and t-shirts. Also, be ready for a bit of rain by packing an umbrella just in case.
December at the Happiest Place on Earth means that the parks are fully decked out for the
Holidays! You’ll discover towering Christmas trees, garland and lights festooned on nearly every available inch, special seasonal overlays on select attractions, and characters donning their holiday best. The sun goes down early this time of year which means that you can experience the lighting of the “it’s a small world” Holiday façade as early as 5:15 p.m. and the
Wintertime Enchantment at Sleeping Beauty's Winter Castle twice each evening around 7:00 p.m. and 8:00 p.m.
I hope your visit to the Disneyland Resort is full of happiness and holiday cheer!
-Linda