Still, inventory levels at ports were moderate compared to past seasons and would act to counter some of the potential weakness, they said.
Meanwhile, the New Zealand domestic market is "sturdy", AgriHQ said.
"Supply and demand elements are in log harvesters' favour at present," the report said. "While many mills throughout the North Island would be more than willing to take in more logs than they currently are, there isn't enough volume available to do this without paying above the market rate."
While in-market returns for logs fell a little, the exchange rate had a large influence on wharf gate prices.
In the pruned market, P1 logs rose to $187 a tonne from $184 a tonne last month - the highest price since June 1995, AgriHQ said.
In the structural market, S1 logs gained to $115 a tonne from $114 a tonne last month, the highest level since June 2014, AgriHQ said.
Pulp prices were unchanged at $49 a tonne and have held within a range of $49 a tonne and $51 a tonne since September 2014, AgriHQ said.
Forest products are New Zealand's third-largest commodity export group behind dairy and meat products.