Port Moresby experiences a tropical savanna climate with warm temperatures year-round and a pronounced dry season that makes it one of the driest capitals in the Pacific.

The wet season brings intense downpours and high humidity, though rainfall totals remain lower than most other Papua New Guinea locations due to the rain shadow effect from surrounding mountains.

Temperatures hover consistently between 24°C and 32°C throughout the year, with minimal variation between seasons but occasional spikes above 35°C during the dry months.

Humidity is oppressive during the wet season but surprisingly manageable during the dry months, while the afternoon sea breeze provides some relief for coastal areas.

Lightweight, quick-drying fabrics are essential year-round since even the dry season can produce surprise showers, and nothing stays fresh for long in this climate.