Niue is one raised coral atoll with limestone caves, chasms, and natural pools at Limu and Talava, with the second-largest concentration of marine reserves in the South Pacific surrounding the rock.
Dry season with humpback whales close to shore July-October, swimming with whales at Tamakautoga, and chasm exploration at Talava and Avaiki Cave.
Wet season with cyclone risk peaking January-March, but the limestone landscape stays accessible and rates drop. Many smaller guesthouses close.
Niue Constitution Celebrations the third week with traditional dance and feasting, the country's main annual cultural event.
Whale season at peak alongside dry trade winds, sea visibility at year-best, and the natural reef pools at Hio and Limu at their clearest.