This year has been the hottest recorded for Tauranga and Te Puke, with other parts of the Bay close behind.
Warm weather is forecast to continue over the holiday break, leading to busy beaches and ringing tills for Mount Maunganui's shops and cafes.
But some other businesses are less likely to benefit.
A Niwa climate scientist yesterday confirmed 2016 was poised to break the 1998 record as New Zealand's hottest year, adding that the next three weeks were likely to be warmer than average in Tauranga and the Western Bay.
The scientist, Brett Mullan, said the average temperature at Tauranga Airport this year was 15.9C - the highest since records began in 1913.
Te Puke was also poised to be hotter than ever with an average of 15C, with Rotorua and Whitianga likely to have their second-highest temperatures, and Whakatane its third-highest.
"They are all running about a degree above normal," Dr Mullan said. "That's quite a lot, quite significant. We are seeing the stark reality of global warming."
Forecasters predict that most of New Zealand will have "normal" temperatures during the next three weeks, but eastern parts of the country such as the Bay of Plenty are likely to be warmer. This means Tauranga and Te Puke's temperature records are almost certain to be broken.
Mount Mainstreet manager Ingrid Fleming said Mount Maunganui would "absolutely" benefit from the warm weather.
"The beaches are going to be busy," she said. "When you're at the beach you pop into town for some shopping and a meal. Who doesn't enjoy sitting outside in the sunshine enjoying a nice meal and a tipple?"
This sentiment was echoed by Hamilton teacher Steve Horne, who spent yesterday morning swimming at Pilot Bay while his wife and daughter walked around Mauao.
"We enjoy the cafes and the swims," he said. "If you live in Hamilton, then any beach is good."
But the weather did not necessarily mean a windfall for businesses outside Mount Maunganui.