Belief businesses aren't out of the woods yet, despite economic activity increasing in the September quarter

Infometrics data shows a 2.6 percent year-on-year rise, driven by stronger tourism and household spending.

Auckland and South Island areas have seen some of the strongest gains.

Tourism Export Council Chief Executive Lynda Keene told Kate Hawkesby Australian visitors through the winter months have played a key role.

She says the results are encouraging, but they won't be too excited until October's results are released, as that's when the season officially begins.

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