The auspicious holiday honours the birthday of Queen Sirikit, mother of His Majesty King Maha Vajiralongkorn Bodindradebayavarangkun.
On Wednesday, all government offices will close, including Phuket Immigration Office, the Employment Office, the Land Transport Office and all three District Offices in Phuket.
All main bank branches will close, but branches in shopping centres will remain open.
All Royal Thai Police and Tourist Police stations will remain open and some local consulates will remain open to serve their respective citizens.
Although the sale of alcohol on the Queen’s Birthday is not prohibited by law, police traditionally encourage people to refrain from drinking alcohol on the auspicious day as a sign of respect and in honour of Queen Sirikit.