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September Weather in Mendi Papua New Guinea

Daily high temperatures are around 69°F, rarely falling below 66°F or exceeding 72°F.

Daily low temperatures are around 55°F, rarely falling below 53°F or exceeding 58°F.

For reference, on October 26, the hottest day of the year, temperatures in Mendi typically range from 56°F to 70°F, while on August 11, the coldest day of the year, they range from 55°F to 68°F.

Average High and Low Temperature in September in Mendi

Average High and Low Temperature in September in MendiSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303052°F52°F54°F54°F56°F56°F58°F58°F60°F60°F62°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°FAugOctSep 169°FSep 169°F55°F55°FSep 3069°FSep 3069°F56°F56°FSep 1169°FSep 1169°F55°F55°FSep 2169°FSep 2169°F56°F56°F
The daily average high (red line) and low (blue line) temperature, 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 hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in September in Mendi

Average Hourly Temperature in September in MendiSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOctcoldcoolcoolcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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The month of September in Mendi experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 90% throughout the month.

The clearest day of the month is September 3, with clear, mostly clear, or partly cloudy conditions 12% of the time.

For reference, on January 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 97%, while on August 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 14%.

Cloud Cover Categories in September in Mendi

Cloud Cover Categories in September in MendiSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 112%Sep 112%Sep 308%Sep 308%Sep 1110%Sep 1110%Sep 219%Sep 219%partly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Mendi, the chance of a wet day over the course of September is gradually increasing, starting the month at 29% and ending it at 32%.

For reference, the year's highest daily chance of a wet day is 56% on February 10, and its lowest chance is 27% on August 12.

Probability of Precipitation in September in Mendi

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September in Mendi is rapidly increasing, starting the month at 3.7 inches, when it rarely exceeds 7.4 inches or falls below 0.6 inches, and ending the month at 4.9 inches, when it rarely exceeds 8.7 inches or falls below 1.3 inches.

Average Monthly Rainfall in September in Mendi

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 snowfall.

Over the course of September in Mendi, the length of the day is essentially constant. The shortest day of the month is September 1, with 12 hours, 0 minutes of daylight and the longest day is September 30, with 12 hours, 9 minutes of daylight.

Hours of Daylight and Twilight in September in Mendi

Hours of Daylight and Twilight in September in MendiSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 6 minSep 2212 hr, 6 mindaydaydaydaynightSep 112 hr, 0 minSep 112 hr, 0 min
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 latest sunrise of the month in Mendi is 6:25 AM on September 1 and the earliest sunrise is 15 minutes earlier at 6:10 AM on September 30.

The latest sunset is 6:25 PM on September 1 and the earliest sunset is 5 minutes earlier at 6:19 PM on September 30.

Daylight saving time is not observed in Mendi during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:08 AM and sets 12 hours, 29 minutes later, at 6:37 PM, while on June 20, the shortest day of the year, it rises at 6:34 AM and sets 11 hours, 46 minutes later, at 6:20 PM.

Sunrise & Sunset with Twilight in September in Mendi

Sunrise & Sunset with Twilight in September in MendiSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:10 AM6:10 AMSep 306:19 PMSep 306:19 PM6:25 AM6:25 AMSep 16:25 PMSep 16:25 PM6:20 AM6:20 AMSep 116:23 PMSep 116:23 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of September. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in September in Mendi

Solar Elevation and Azimuth in September in MendiSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOct001010202020303040405050506060707080800001010202030303040405050606060707080
northeastsouthwest
Solar elevation and azimuth over the course of September 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for September 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in September in Mendi

Moon Rise, Set & Phases in September in MendiSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 49:14 PMAug 49:14 PMAug 204:26 AMAug 204:26 AMSep 311:56 AMSep 311:56 AMSep 1812:35 PMSep 1812:35 PMOct 34:50 AMOct 34:50 AMOct 179:27 PMOct 179:27 PM6:17 AM6:17 AM6:21 PM6:21 PM6:02 PM6:02 PM6:45 AM6:45 AM6:23 AM6:23 AM6:35 PM6:35 PM6:33 PM6:33 PM6:57 AM6:57 AM6:14 AM6:14 AM6:39 PM6:39 PM6:05 PM6:05 PM6:21 AM6:21 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Sep 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
4%5:01 AMENE5:06 PMWNW-11:04 AMN248,115 mi
2
1%5:44 AMENE5:52 PMWNW-11:48 AMN249,726 mi
3
0%6:23 AME6:35 PMW-12:30 PMN250,994 mi
4
1%7:01 AME7:17 PMW-1:09 PMN251,888 mi
5
4%7:37 AME7:58 PMW-1:47 PMN252,354 mi
6
8%8:13 AME8:40 PMW-2:26 PMS252,325 mi
7
15%8:50 AMESE9:23 PMWSW-3:06 PMS251,724 mi
8
22%9:30 AMESE10:09 PMWSW-3:48 PMS250,482 mi
9
31%10:12 AMESE10:57 PMWSW-4:33 PMS248,552 mi
10
41%10:59 AMESE11:49 PMWSW-5:23 PMS245,932 mi
11
50%11:50 AMESE--6:17 PMS242,679 mi
12
62%-12:45 AMWSW12:45 PMESE7:14 PMS238,928 mi
13
72%-1:42 AMWSW1:44 PMESE8:13 PMS234,903 mi
14
82%-2:40 AMWSW2:44 PMESE9:11 PMS230,905 mi
15
90%-3:36 AMWSW3:43 PMESE10:08 PMS227,290 mi
16
96%-4:30 AMWSW4:41 PMESE11:02 PMS224,417 mi
17
100%-5:20 AMWSW5:38 PME11:54 PMS222,591 mi
18
100%-6:09 AMW6:33 PME--
19
100%-6:57 AMW7:27 PME12:45 AMN222,009 mi
20
96%-7:46 AMW8:23 PMENE1:36 AMN222,719 mi
21
90%-8:36 AMWNW9:21 PMENE2:29 AMN224,615 mi
22
82%-9:30 AMWNW10:21 PMENE3:24 AMN227,460 mi
23
72%-10:26 AMWNW11:22 PMENE4:22 AMN230,934 mi
24
61%-11:24 AMWNW-5:22 AMN234,695 mi
25
50%12:22 AMENE12:23 PMWNW-6:22 AMN238,435 mi
26
39%1:19 AMENE1:19 PMWNW-7:20 AMN241,908 mi
27
29%2:11 AMENE2:13 PMWNW-8:13 AMN244,954 mi
28
20%3:00 AMENE3:03 PMWNW-9:02 AMN247,490 mi
29
13%3:43 AMENE3:50 PMWNW-9:47 AMN249,489 mi
30
7%4:23 AMENE4:34 PMW-10:29 AMN250,967 mi

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 chance that a given day will be muggy in Mendi is essentially constant during September, remaining around 0% throughout.

For reference, on May 3, the muggiest day of the year, there are muggy conditions 0% of the time, while on February 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in September in Mendi

Humidity Comfort Levels in September in MendiSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 160%Sep 160%Sep 10%Sep 10%Sep 300%Sep 300%humidhumidcomfortablecomfortabledrydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 Mendi is essentially constant during September, remaining within 0.1 miles per hour of 2.7 miles per hour throughout.

For reference, on July 30, the windiest day of the year, the daily average wind speed is 2.9 miles per hour, while on April 23, the calmest day of the year, the daily average wind speed is 2.3 miles per hour.

Average Wind Speed in September in Mendi

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

The wind direction in Mendi during September is predominantly out of the east from September 1 to September 24 and the south from September 24 to September 30.

Wind Direction in September in Mendi

Wind Direction in September in MendiESSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Mendi are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in September in Mendi

Time Spent in Various Temperature Bands and the Growing Season in September in MendiSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 16100%Sep 16coldcoolcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Mendi are increasing during September, increasing by 329°F, from 652°F to 981°F, over the course of the month.

Growing Degree Days in September in Mendi

Growing Degree Days in September in MendiSep112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030600°F600°F650°F650°F700°F700°F750°F750°F800°F800°F850°F850°F900°F900°F950°F950°F1,000°F1,000°F1,050°F1,050°FAugOctSep 1652°FSep 1652°FSep 30981°FSep 30981°FSep 11764°FSep 11764°FSep 21878°FSep 21878°F
The average growing degree days accumulated over the course of September, with 25th to 75th and 10th to 90th percentile bands.

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 in Mendi is essentially constant during September, remaining within 0.1 kWh of 4.8 kWh throughout.

The highest average daily incident shortwave solar energy during September is 4.9 kWh on September 3.

Average Daily Incident Shortwave Solar Energy in September in Mendi

Average Daily Incident Shortwave Solar Energy in September in MendiSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhAugOctSep 34.9 kWhSep 34.9 kWhSep 304.7 kWhSep 304.7 kWhSep 164.8 kWhSep 164.8 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Mendi are -6.148 deg latitude, 143.656 deg longitude, and 5,673 ft elevation.

The topography within 2 miles of Mendi contains large variations in elevation, with a maximum elevation change of 2,831 feet and an average elevation above sea level of 6,226 feet. Within 10 miles contains large variations in elevation (5,610 feet). Within 50 miles also contains extreme variations in elevation (14,006 feet).

The area within 2 miles of Mendi is covered by trees (65%) and cropland (18%), within 10 miles by trees (89%), and within 50 miles by trees (88%).

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

Mendi is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.

The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Mendi, according to the International Standard Atmosphere .

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

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