Port Moresby weather in September
September in Port Moresby: sweltering, a little rain, with clean air — a great time to visit.
#4 of 12 months in Port Moresby · #417 of 604 destinations to visit in September · comfort 71/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Port Moresby climate normals — September
| Daytime high | 30°C / 86°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 23°C / 74°F | |
| Feels like (high) | 34°C / 93°F | |
| Rainfall | 59 mm / 2.3 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 22°C / 72°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 12.1 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Port Moresby in September — FAQ
- Is September a good time to visit Port Moresby?
- September in Port Moresby: sweltering, a little rain, with clean air — a great time to visit. It ranks #4 of 12 months for Port Moresby on SeasonMap's comfort score (71/100).
- What is the weather like in Port Moresby in September?
- In September, Port Moresby averages a daily high of 30.2°C and a low of 23.4°C, with about 59 mm of rain over roughly 10.2 rainy days.
- What is the air quality in Port Moresby in September?
- Port Moresby has a mean US Air Quality Index of about 38 in September.