A group of 25 whales stranded around 2pm yesterday at Triangle Flat. The whales were part of a pod of around 70 which were seen close to the beach earlier the day.
Seven of the whales unfortunately died.
Department of Conservation staff, Project Jonah volunteers and the public worked to keep the whales alive overnight and refloat them this morning.
DOC Golden Bay area manager John Mason said overnight conditions were working in the whale's favour.
"It's been dark which has been good for them, they suffer during daylight, if the sun's out they get sunburnt so it would have been cool last night, and it would have been dark so the whales had the best possible conditions to spend the night on the beach."
Ms Muncaster said the refloated whales "are not out of the woods yet".
"In their disoriented state they can easily restrand, so Project Jonah medics in the area and locals should remain on high alert for the next few days and keep informed through the Project Jonah website."
She asked locals to keep an eye out for the whales and call the Department of Conservation if any are seen to restrand.