"While the growth spurt we've seen over the last few months has come during the traditional quiet winter months, and it's still inconsistent across regions and sectors, it's very promising to see the higher spending patterns continue," he said.
Building outlets and hospitality providers were once again the big winners during August, Whiston said.
Hardware stores saw 15.6 per cent annual growth, furniture and floor covering outlets 9.8 per cent and appliance stores 8.1 per cent.
Cafés and restaurants experienced an 11.7 per cent jump year-on-year, followed by bars and clubs (+7.4 per cent) and accommodation providers (+9.3 per cent).
Clothing stores, footwear shops and department stores all saw modest growth but things slowed amongst recreational goods retailers and chemists.
Annual spending rose in every region except for the West Coast, which saw a decline of 1.1 per cent.
Marlborough reported the biggest jump (+11.8 per cent), followed by Palmerston North (+10.5 per cent) and Canterbury (+9.5 per cent).
Canterbury spending was clearly benefiting from the rebuild, Whiston said.