As expected, former council member Kittisun Kuru placed third with only 580 total votes.
Just over 8,500 voters out of Patong's 12,651 registered voters came out to cast their ballots, about 68 per cent.
Ms Chalermluk, leader of the Patong Fah Mai (Patong New Sky) Party, was previously elected twice to represent Phuket in Thai Parliament with the Democrat Party.
Chalermluk comes from an influential local family - owners of hotels, restaurants, and commercial real estate -and her brother-in-law, Chai'anan Sutikul, is Mayor of neighboring Kathu.
She campaigned on a five-plank election platform, all of which involved wiping out negative aspects of Patong: people using public land for private gain, deterioration of natural environment, flooding, traffic woes, and "Mafia" activities.
Her main opponent was former mayor Pian, who was continuously elected to the position for many year until last September. At that time, he and four others were suspended pending investigation of allegations they had a hand in rigging the previous year's mayoral election by "importing" voters from Phang Nga and registering them at Patong addresses.
Former mayor Pian is also the chairman of the Patong Taxi Federation, whose members were expected to feature large in the electorate.
Kittisun, meanwhile, was regarded as a rank outsider in this election and was expected to receive only a handful of votes.
Alcohol sales will be banned until midnight tonight (April 26).