The New Year's Eve Countdown Celebration was set for 9 p.m. and midnight, but the park tweeted earlier in the evening the show will "likely" have "limited fireworks."
Due to the winds being unpredictable, the park said it wouldn't have definitive information until the start of each show.
Due to high winds, it is likely we will present limited fireworks in our New Year’s Eve Countdown Celebration at 9 p.m. and midnight. Wind conditions are unpredictable; we don’t expect definitive information until show time. Check the app for Countdown locations.— Disneyland Today (@DisneylandToday) January 1, 2019
Guests were urged to check the Disneyland app for more details.