Thailand public holidays in December 2027

December 2027 in Thailand runs 31 calendar days, the depth of Northern-hemisphere winter and Southern-hemisphere summer. Thailand observes 4 public holidays in December 2027: King Bhumibol's Birthday/Father's Day, King Bhumibol's Birthday/Father's Day Observed, Constitution Day, New Year's Eve. 3 of those fall on weekdays and reduce the working-day count accordingly. That leaves 20 working days for Thailand businesses, payroll cycles, and project schedules in December 2027. December centres on the Christmas long weekend in Christian countries and a cluster of solstice and winter-celebration days globally. For broader context, see the full 2027 calendar for Thailand or the global view of holidays observed in December 2027 across all 190 countries we cover.