St John is having to increase staff and re-arrange the distribution of ambulances to cover what is expected to be the busiest next two months in its history, Radio New Zealand reports.
The charitable organisation has used forecasting technology to predict it will receive 35,000 callouts in July and just under that number in August.
In the Bay of Plenty region the increase will mean an average of 90 calls a day, and it could go up as high as 95 calls a day.
Bay of Plenty/East Cape District Operations Manager Jeremy Gooders said the increase in the workload in urban Bay of Plenty areas has usually been at about 4 percent, but in the past twelve months it has been 8.6 per cent.