The survey came after government figures showed New Zealand's unemployment rate unexpectedly rose 0.1 per cent points to 6.8 per cent in the second quarter, the highest level since June 2010.
Separately, national property values rose 2.2 per cent in the three months ended July 31 as homes in Auckland and Christchurch continue to appreciate amid a shortage of supply, according to government valuer Quotable Value.
On a regional basis, Auckland recorded the largest increase in confidence up 9.2 per cent points to 119. Wellington was the lowest on 105 per cent points, little changed from 105.7 in July.
Confidence of consumers older than 25 rebounded in August, while the 25 to 34 age group was the only group to report a decline.
"Confidence levels tend to be higher for the younger cohorts, with those ages 50 years or older remaining the least confident age group," Bagrie said.
Inflation expectations eased to 3.1 per cent from 3.3 per cent a month earlier.
Meanwhile, confidence among farmers took another fall this month in light of prevailing uncertainty in global markets, softer commodity prices, and the expectation that the run of good seasonal conditions wouls not continue.
Rabobank's latest Rural Confidence Survey showed farmer pessimism had increased in regard to both the performance of their own farm businesses and the wider agricultural economy.
Compared to 27 per cent last quarter, 36 per cent expected the agricultural economy to worsen in the coming 12 months.
Only 11 per cent expected conditions to improve, a drop of six per cent from last quarter.