Thailand's King Maha Vajiralongkorn greeted thousands of his subjects from a balcony of his Grand Palace, the third and final day of coronation ceremonies.

The king and queen were greeted with a band playing the royal anthem and a 21-gun salute.

The monarch and new Queen Suthida waved to a large crowd wearing yellow, the colour associated with the king, and waving flags in a royal audience, a day after a grand procession through Bangkok.

"I and the Queen are very pleased and delighted to see all the citizens together to express goodwill for my coronation," he told them in his speech, thanking citizens for their blessings and wishing them happiness and success.

"May the unity in expressing your goodwill to me today be a good start for everyone, every party to unify your duties for the prosperity of our country."

The three branches of the armed forces saluted the king before the prime minister and crowd chanted, "Long live the king!"

The king then met foreign ambassadors and thanked them for their attendance, concluding the coronation ceremonies.

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The coronation started on Saturday, after a long period of official mourning for the king's revered father, who died in October 2016 having reigned for 70 years.

Yesterday, the king was carried through the streets on a gilded palanquin for the royal procession. 

Well-wishers, all wearing yellow, gathered from early morning along the 7km route from the Grand Palace to three royal temples.

Since becoming king 18 months ago, Vajiralongkorn has moved to consolidate the authority of the monarchy, including taking more direct control of the crown’s vast wealth with the help of the military government.

Vajiralongkorn spends a great deal of time in Germany and has been divorced three times.

The monarchy is shielded by some of the world's harshest lese majeste laws, making any critical discussion about the king all but impossible. 

But wall-to-wall coverage and social media posts of the ceremony provided rare glimpses into the private lives of the ultra-guarded royal family. 

After today's address, the king's fashion designer daughter Princess Sirivannavari was seen capturing the moment on a smartphone and waving to the crowd.

Over the weekend she took to Facebook to post personal shots of her and her family members, garnering more than 120,000 shares. 

The king's eldest sister Princess Ubolratana has long used Instagram as a way to communicate with fans. 

She drew headlines in February when she tried to stand for prime minister with an anti-junta party. The king thwarted the bid with a royal command and the party was later dissolved.

Though she was seen hugging the king at the ceremony, she was asked in the comments section of a photo she posted on Saturday why she did not receive a royal title during the event.

"Because my work is in this style," she said. "It's more convenient and effective this way."