Activity in the services sector has risen after a wintry soft patch.
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The BNZ - Business New Zealand Performance of Services Index rose 1.3 points in August to 57.3.
A reading over 50 indicates expansion.
That gain follows a drop in July because of bad weather.
If the August data is broken down - activity, sales and new orders rose to sit in the 60 level, while employment fell.
BNZ senior economist Craig Ebert said there doesn't appear to be any pre-election jitters in the latest number.
"Melded with the Performance of Manufacturing Index, the latest PSI forms a picture of rude growth in the NZ economy, overall.
"Indeed, the composite index continues to point to annual GDP growth running in the order of 3 to 4 percent," he said.
Last month's PMI data rose after a weaker July result.