It was moving into the quieter months for New Zealand production and therefore fresh product for the auction platform.
Any major price movements would be influenced by the urgency of buyers looking to obtain product prior to the new season, Ms Higgins said.
Mr Penny said there was clear potential for the bank's milk price forecasts to move higher.
While the sharp drop in the NZ dollar could reverse, the bank was more confident that butter prices would rise further and potentially take other key dairy prices like whole milk powder with it.
Fonterra was due to announce its opening 2018-19 milk price forecast next week and ASB expected it to front foot the new season with a healthy forecast of $6.50 or better.
With the 2017-18 season coming to a close at the end of May, Westpac senior economist Anne Boniface said Fonterra's $6.55 forecast for that season was unlikely to change signifcantly in the final wash-up. A feature of the season had been the remarkable stability in dairy prices.