Climate Insights for Port Moresby

The climate in Port Moresby is hot. The average annual temperature is 26°C and approximately 1686mm of precipitation falls per year. Port Moresby receives a notable amount of rainfall throughout the year, including during its driest month. Port Moresby sits near the equator, so seasonal temperature differences are minimal throughout the year.

Port Moresby has relatively stable temperatures year-round, staying within a 5°C range. The warmest month is February, when average highs reach 29°C and the mean temperature sits around 27°C. August is the coolest month, with minimum temperatures around 24°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows.

Port Moresby is a fairly wet location, receiving approximately 1686mm of precipitation annually, which averages out to around 141mm per month. The wettest month is March, averaging 326mm of rainfall. January and February also tend to see above-average precipitation. The driest month is July, with just 37mm. That's 289mm less than March, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Port Moresby is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 4km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 6km/h in winter, 5km/h in spring, 4km/h in summer, 4km/h in autumn.

It is currently winter in Port Moresby, which began on June 21, 2026. Port Moresby sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in February at around 29°C, while the coldest stretch bottoms out in August near 24°C. Spring is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Port Moresby is during August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 25°C with modest rainfall averaging 59mm per month. By contrast, February can be uncomfortably hot with temperatures reaching 29°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Port Moresby based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.