Port Moresby weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: June – August
What is the weather like in Port Moresby in September?
In September, Port Moresby is hot: daytime highs average 30 °C, and even at night it stays warm at around 22 °C. The sea averages 25.6 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 87 mm in total. On about 12 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Port Moresby.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 67 | 53 | 42 |
| Day | 29° | 30° | 30° |
| Night | 22° | 22° | 23° |
| Sea | 25° | 26° | 27° |
| Sun | 6 h | 6 h | 6 h |
| Rain days | 10 | 14 | 18 |
More details for September
- Daylight
- 12 h 2 min06:06 – 18:08
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 28 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 73 %on averageAll months
- Hot days
- 12 days30 °C or moreAll months
- Time zone
- UTC+10Pacific/Port_Moresby
How the score comes together
- Temperatureweight 50 %69 %
- Sunshineweight 20 %50 %
- Few rainy daysweight 30 %30 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Port Moresby in September: quick answers
Is Port Moresby hot in September?
Yes. In September, Port Moresby is hot: daytime highs average 30 °C and nights stay around 22 °C. On about 12 days the thermometer climbs to 30 °C or more.
Can you swim in Port Moresby in September?
Yes. In September the sea averages 25.6 °C – pleasant for swimming.
Does it rain much in Port Moresby in September?
Rain is frequent, with about 14 rainy days and 87 mm in total.
Port Moresby month by month
The whole year in Port MoresbyAll destinations: Papua New GuineaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences