Having caused widespread flooding and damage in Samoa and American Samoa as a category two storm, Gita had veered southeast and was forecast to pass close to Niue's east coast overnight.
The Fiji Meteorological Service, which is responsible for warnings in the region, said Gita continued to intensify, and would likely do so for the coming day.
On current forecasts, it is expected to pass very close to the island's east coast, possibly as a category three storm.