Port Moresby, Papua New Guinea Climate & Monthly Averages

The climate of Port Moresby

There is not much of a seasonal calendar in Port Moresby. Its warmest and coolest months differ by 2°C, against a dataset median nearer 15°C, which leaves 88°F (31°C) in December and 84°F (29°C) in August as the two ends of the year.

Climate quick facts

• Hottest month: December - highs near 88°F (31°C)
• Coldest month: August - highs near 84°F (29°C)
• Decade extremes (2015-2024): 95°F (35°C) high · 63°F (17°C) low
• Wettest month: March (24 rainy days) · Sunniest: November (11.1 h sun/day)
• Climate type: tropical wet-and-dry
• Annual swing: 2°C between the average warmest and coolest month · day to night: 6°C
• Months averaging 30°C or hotter: 6
• Average humidity: 82%

Temperatures through the year

August is the coolest month, with highs of 84°F (29°C) and lows near 74°F (23°C). Warmth peaks in December: highs of 88°F (31°C), lows of 76°F (24°C). The gridded 2015-2024 daily record for this location tops out at 95°F (35°C) and bottoms at 63°F (17°C) - decade extremes, not all-time station records. Between the average December and the average August lie 2°C, a narrower spread than all but 4% of the 3496 cities in our dataset.

Rain, sun and snow

Average highs hold at or above 30°C for 6 months of the year, October through March being the unbroken run. Days and nights are about 6°C apart on average - narrower than all but 8% of the 3496 cities in our dataset. Relative humidity averages 82% across the year, more humid than 92% of the 3496 cities in our dataset - enough that summer afternoons feel hotter than the thermometer says, which is what the dew point converter is for.

How Port Moresby compares

• Port Moresby averages 80°F (26°C) across the year - warmer than 91% of the 3496 cities we track.
• Rain or snow reaches the ground on 195 days a year - more wet days than 90% of the 3496 cities we track.

Ranked against every city in our dataset, each measured on the same ten-year window.

Best time to visit Port Moresby

Aim for June to September if you get the choice: humidity and rainfall are at their lowest, which is what actually varies here, and highs average 84°F (29°C) against roughly 11 wet days a month. For the same question asked the other way round, see where else is warm in June.

Pack for Port Moresby with light clothing for the warm months, proper waterproofs rather than an umbrella - wet days are the norm here and moisture-wicking fabrics for the humidity. Even in December, lows of 76°F (24°C) make an extra layer worth the space.