Farmers were already having to look outside the area for grazing and start using supplementary feed.
"Farmers are doing the best they can to deal with the current situations, but as dry conditions continue, the situation is getting worse. The Government needs to act immediately and support these farmers," he said.
O'Connor said he was aware of the weather situation in the district and it had been actively monitored for some time.
Local groups such as Federated Farmers were active on the ground providing advice and support to farmers.
"I've been told that support from local industry is meeting farmers' needs at this stage. I'm also told farmers in the area are doing the right thing and are actively managing the situation with the resources at their disposal," O'Connor said.
"At the end of the day, what is going to alleviate the situation is rain. There has been some good rain over the last week, more is needed, and I will continue to monitor the situation so we're ready to step in if required."
Southland farmers able to provide short-term grazing, particularly for ewes and hoggets, were asked to contact Otago Federated Farmers territory manager Nick Abbott.