Climate Overview
The climate in Port Moresby is hot. The average annual temperature is 26°C and approximately 1712mm 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.
Temperature
Port Moresby has relatively stable temperatures year-round, staying within a 7°C range. The warmest month is December, when average highs reach 30°C and the mean temperature sits around 27°C. August is the coolest month, with minimum temperatures around 23°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows.
Precipitation
Port Moresby is a fairly wet location, receiving approximately 1712mm of precipitation annually, which averages out to around 143mm per month. The wettest month is March, averaging 281mm of rainfall. January and February also tend to see above-average precipitation. The driest month is July, with just 43mm. That's 238mm 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.
Wind
Port Moresby is relatively calm, with an average annual wind speed of 11km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 9km/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 15km/h in winter, 12km/h in spring, 9km/h in summer, 9km/h in autumn.
Seasons
2 days until Spring
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 December at around 30°C, while the coldest stretch bottoms out in August near 23°C. Spring is next, beginning on September 23, 2026 (2 days from now).
Spring
Temperatures range from 24 to 30°C. Rainfall is heavy, totalling around 307mm across the season with a monthly average of 102mm. Winds are generally light, averaging 12km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 30°C. Rainfall is heavy, totalling around 649mm across the season with a monthly average of 216mm. Winds are generally light, averaging 9km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 30°C. Rainfall is heavy, totalling around 614mm across the season with a monthly average of 205mm. Winds are generally light, averaging 9km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 23 to 29°C. Rainfall is relatively light, with around 141mm over the season and a monthly average of 47mm. Winds are moderate at around 15km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
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.
