Papua New Guinea in December: Weather, Crowds & What to Expect

The Highlands (Mount Hagen, Goroka, Mt. Wilhelm)

December is the wettest month for many highland pockets - warm daytime temps with heavy, sometimes all-day rain in the higher catchments, and strong mist that can hide trails. Rivers can flood quickly and remote lodges sometimes limit guest numbers; flights will be disrupted by low cloud. If visiting, allow long transit windows, keep spare clothing, and prioritize nearby village experiences rather than attempting high summits.

Southern Coast & Port Moresby (Papuan Gulf, Gulf Province)

December returns to the wet pattern with warm, humid days and often heavy, sustained rainfall in the afternoons and evenings; flooding is possible in low-lying coastal settlements near the Fly and Kikori estuaries. Holiday travel can be slower and some rural roads may be impassable-plan extra time if you must move between provinces. If diving, check operators’ advisories for reef conditions and avoid exposed passages during storms.

Trans‑Fly & Western Lowlands (Fly River, Western Province, Trans‑Fly)

December is often very wet, with heavy storms and persistent inundation across low-lying parts of Western Province and the Fly catchment; day trips by land can become lengthy and river travel takes over. Flights to remote airstrips are vulnerable to cancellations from low cloud and storms, and some lodges close seasonally. Arrange travel with operators who monitor river gauges and pack durable waterproofs and medical supplies.

Northern Coast & Sepik (Madang, Wewak, Sepik River)

Heavy squalls and high humidity dominate December along the northern coast and Sepik-daytime rains are frequent and river transport often becomes the only practical movement between settlements. Festive holiday travel can increase local traffic on the river and strain air services to the coast, so expect congestion in hubs like Wewak. Waterproof everything and be prepared for rapid changes in plans as creeks and tracks become impassable.

Bismarck & Solomon Islands Region (New Britain, New Ireland, Manus, Bougainville)

December often brings heavy, humid conditions and rough sea swells across the archipelago; Christmas and holiday travel increases local boat and flight traffic, compounding any weather-related delays. Some resorts and dive operators close for the wet season or run on limited schedules, so confirm availability well ahead. If travelling, bring storm-ready gear, keep full wet-weather protective cases for kit and expect slower inter-island connections.