Port Moresby Weather in September
Port Moresby in September sees high temperatures, with highs around 30°C (86°F) and overnight lows of 23°C (73°F). Rainfall is fairly high at around 66 mm (2.6 in) on average, so pack waterproofs just in case.
Rainfall in Port Moresby in September
Typically around 7 days of rainfall are expected, averaging 66 mm (2.6 in) for the month. When rain does fall this month, it tends to come down hard. The low number of rain days makes each shower more significant.
Temperature in Port Moresby in September
If you're visiting Port Moresby in September, expect highs of 30°C (86°F) and overnight lows around 23°C (73°F). This kind of day-to-night contrast is typical for this time of year. With lows around 23°C (73°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Port Moresby in September
The month enjoys around 215 hours of sunshine, creating mostly sunny days with good weather conditions.
Average water temperature in September
At 26°C (79°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
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 September
Min Temperature
23°C (73°F)
Max Temperature
30°C (86°F)
Water Temperature
26°C (79°F)
Chance of Rain
23%
Precipitation
66 mm (2.6 in)
Rainy days
7 days
Humidity
75%
Sunshine
215 hours
Percentage Sunshine
Daily Historical Temperatures
48-year average (1976-2025)
Based on our historical records, temperatures in Port Moresby typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Historical weather for Port Moresby in September
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.
Port Moresby historical weather extremes in September
Based on weather observations in Port Moresby between 2004 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 9, 2024, with a maximum of 39°C (102°F).
- The lowest daytime temperature in September was 26°C (79°F), recorded on September 20, 2018.
- Nighttime temperatures dropped to 19°C (66°F) on September 17, 2023, marking the coldest September night on record.
Best Places in Papua New Guinea in September
Find out more about the weather in Papua New Guinea and which places have the best travel conditions in this month. See all of Papua New Guinea in September →
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What to Wear in Port Moresby in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Rain is likely on several days, so bring a good rain jacket. The water temperature sits at about 26°C (79°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Port Moresby in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Papua New Guinea, check out our Port Moresby's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Port Moresby climate overview or explore weather in Papua New Guinea.
