Port Moresby Weather in December

December in Port Moresby brings very high temperatures around 31°C (88°F) during the day, dropping to 24°C (75°F) at night, and as part of the rainy season, heavy rainfall is common.

Rainfall in Port Moresby in December

As part of the rainy season, Port Moresby sees around 13 days of rain in December, with an average of 195 mm (7.7 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours, often in the late afternoon.

Temperature in Port Moresby in December

Temperatures in Port Moresby in December top out at 31°C (88°F) and drop to 24°C (75°F) overnight. It's usually most comfortable outside during the morning and later in the day. Nights are warm at 24°C (75°F). It's worth making sure your accommodation has decent ventilation or air conditioning.

Sunshine in Port Moresby in December

Expect a lot of sunshine this month, with about 218 hours of sun. Showers typically arrive in the late afternoon or evening, keeping mornings and early afternoons sunny. Even during the wet season, there's plenty of sunshine for sightseeing.

Average water temperature in December

At 28°C (82°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.

If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Port Moresby. Our weather planner can help you explore destinations with more pleasant weather conditions.

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For a detailed overview over the year and the best time to visit Papua New Guinea, check out our Port Moresby's climate page.

Port Moresby Temperature in December

Min Temperature 24°C (75°F)  

Max Temperature 31°C (88°F)  

Water Temperature 28°C (82°F)  

Chance of Rain 43%  

Precipitation 195 mm (7.7 in)  

Rainy days 13 days  

Humidity 77%  

Sunshine 218 hours  

Percentage Sunshine  

Daily Historical Temperatures

48-year average (1976-2025)

Based on our historical records, temperatures in Port Moresby typically stay consistent throughout December, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).

Average temperatures in December

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Historical weather for Port Moresby in December

Browse day-by-day weather records for Port Moresby spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Port Moresby historical weather extremes in December

According to our 20 years of weather records for Port Moresby, the following extremes were recorded between 2005 and 2025.

• The warmest day in December was on December 31, 2017, with a maximum of 39°C (102°F).
• The coldest December day was on December 18, 2021, with a maximum of 27°C (81°F).
• The coldest night in December in Port Moresby was on December 17, 2012, with a minimum of 20°C (68°F).
• The wettest day in December Port Moresby was on December 12, 2022 with 121 mm (4.8 in) of precipitation.

What to Wear in Port Moresby in December

Warm temperatures in December make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! The water temperature sits at about 28°C (82°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Port Moresby in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

8/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Papua New Guinea, check out our Port Moresby's climate page.

More climate data for Port Moresby

Temperature Rainfall Sunshine Humidity Water Temp

See the full Port Moresby climate overview or explore weather in Papua New Guinea.