Spend in New Zealand as a whole was down 15.9 per cent for the same period.
Similarly, employment in Whanganui has been affected at a lower level than elsewhere in New Zealand.
Of the country's 67 districts, Whanganui has had the third smallest increase of people on the Jobseeker Support benefit.
Newly released house price data from REINZ was also positive, with the median price up 25 per cent from last June.
"That highlights the strong economy and that people are looking to move to the area or regard Whanganui as a firm place to plant themselves and their families," Olsen said.
As for the future, Olsen said that New Zealand is still in the early stages of the economic hit.
He noted that there is still economic buffering in place through the wage subsidy and Covid-19 income relief payment programmes.
Both programmes are set to expire in September.
He also noted the challenges posed by an interconnected global economy.
"New Zealand might be doing all right, and China might be doing all right, but if China's trading partners in the US and Europe aren't doing all right, eventually that feedback loop does come back to bite us too.
"We're certainly not out of the woods, but things are brighter than expected."