The September quarter's reprieve from inflation is likely to be temporary, according to one expert.

The Consumers Price Index measure of household expenses rose 3.7 percent in the year to September - down from 4.1 annually to June.

Infometrics Principal Economist Brad Olsen says changes since mean it'll go up again - pushed by many costs.

"Going through into building costs, we've seen the likes of international airfares that have gone up, we've seen property maintenance costs lift - all of that just makes us uncomfortable when you take all of that into account." 

LISTEN ABOVE