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Average Weather in Port Moresby Papua New Guinea

In Port Moresby, the temperature typically varies from 73°F to 88°F over the course of the year, and is rarely below 71°F or above 92°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccomfortablecomfortablewarmwarmhothot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day in Port Moresby does not vary substantially over the course of the year, staying within 40 minutes of 12 hours throughout. In 2017, the shortest day is June 21, with 11 hours, 34 minutes of daylight; the longest day is December 21, with 12 hours, 41 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:39 AM on November 17, and the latest sunrise is 49 minutes later at 6:28 AM on July 14. The earliest sunset is at 5:57 PM on May 28, and the latest sunset is 43 minutes later at 6:40 PM on January 27.

Daylight saving time (DST) is not observed in Port Moresby during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Clouds

In Port Moresby, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Port Moresby begins around May 18 and lasts for 5.4 months, ending around October 30. On August 19, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 37% of the time, and overcast or mostly cloudy 63% of the time.

The cloudier part of the year begins around October 30 and lasts for 6.6 months, ending around May 18. On January 9, the cloudiest day of the year, the sky is overcast or mostly cloudy 92% of the time, and clear, mostly clear, or partly cloudy 8% of the time.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 992%Jan 992%Aug 1963%Aug 1963%May 1877%May 1877%Oct 3078%Oct 3078%overcastovercastmostly cloudymostly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Port Moresby varies significantly throughout the year.

The wetter season lasts 4.6 months, from December 13 to April 30, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 49% on March 1.

The drier season lasts 7.5 months, from April 30 to December 13. The smallest chance of a wet day is 7% on July 17.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 49% on March 1.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Port Moresby experiences very significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Port Moresby. The most rain falls during the 31 days centered around March 8, with an average total accumulation of 7.7 inches.

The least rain falls around September 4, with and average total accumulation of 0.7 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Port Moresby, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 96% throughout.

Humidity Comfort Levels

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecAug 1592%Aug 1592%100%Feb 17100%Feb 17miserablemiserableoppressiveoppressivemuggymuggy
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Port Moresby experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 5.3 months, from May 16 to October 25, with average wind speeds of more than 5.5 miles per hour. The windiest day of the year is July 31, with an average hourly wind speed of 6.9 miles per hour.

The calmer time of year lasts for 6.7 months, from October 25 to May 16. The calmest day of the year is March 23, with an average hourly wind speed of 4.0 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Port Moresby varies throughout the year.

The wind is most often from the west for 2.4 months, from January 5 to March 16, with a peak percentage of 47% on February 22. The wind is most often from the south for 9.6 months, from March 16 to January 5, with a peak percentage of 76% on August 7.

Wind Direction

WWSS0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Port Moresby is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 4.7 months, from December 3 to April 25, with an average temperature above 83°F. The day of the year with the warmest water is January 19, with an average temperature of 85°F.

The time of year with cooler water lasts for 3.4 months, from July 1 to October 12, with an average temperature below 79°F. The day of the year with the coolest water is August 15, with an average temperature of 77°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.4 months, from August 24 to November 7, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is September 16, with an average of 6.3 kWh.

The darker period of the year lasts for 6.2 months, from December 30 to July 5, with an average daily incident shortwave energy per square meter below 4.9 kWh. The darkest day of the year is May 7, with an average of 4.6 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Port Moresby are -9.443 deg latitude, 147.180 deg longitude, and 187 ft elevation (map ).

The topography within 2 miles of Port Moresby contains significant variations in elevation, with a maximum elevation change of 764 feet, and an average elevation above sea level of 278 feet. Within 10 miles contains very significant variations in elevation (1,539 feet). Within 50 miles contains extreme variations in elevation (13,173 feet).

The area within 2 miles of Port Moresby is covered by artificial surfaces (90%), within 10 miles by water (43%) and trees (18%), and within 50 miles by water (54%) and trees (37%).

Data Sources

This report illustrates the typical weather in Port Moresby, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There is only a single weather station, Jacksons International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Port Moresby.

At a distance of 4 kilometers from Port Moresby, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Port Moresby according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .