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September Weather in Nanortalik Greenland

Daily high temperatures decrease by 4°F, from 45°F to 41°F, rarely falling below 36°F or exceeding 52°F.

Daily low temperatures decrease by 3°F, from 38°F to 35°F, rarely falling below 30°F or exceeding 43°F.

For reference, on July 30, the hottest day of the year, temperatures in Nanortalik typically range from 38°F to 47°F, while on February 27, the coldest day of the year, they range from 21°F to 28°F.

Average High and Low Temperature in September in Nanortalik

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 Nanortalik

Average Hourly Temperature in September in NanortalikSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOctvery cold
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.

King Cove, Alaska, United States (3,768 miles away) and Diamond Ridge, Alaska, United States (3,273 miles) are the far-away foreign places with temperatures most similar to Nanortalik (view comparison).

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The month of September in Nanortalik experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 63% to 56%.

The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 44% of the time.

For reference, on February 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 75%, while on October 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 48%.

Cloud Cover Categories in September in Nanortalik

Cloud Cover Categories in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 137%Sep 137%Sep 3044%Sep 3044%Sep 1139%Sep 1139%Sep 2143%Sep 2143%clearmostly clearpartly 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 Nanortalik, the chance of a wet day over the course of September is gradually decreasing, starting the month at 36% and ending it at 33%.

For reference, the year's highest daily chance of a wet day is 38% on September 9, and its lowest chance is 27% on March 20.

Over the course of September in Nanortalik, the chance of a day with only rain decreases from 36% to 30%, the chance of a day with mixed snow and rain increases from 0% to 2%, and the chance of a day with only snow remains an essentially constant 0% throughout.

Probability of Precipitation in September in Nanortalik

Probability of Precipitation in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%AugOctSep 938%Sep 938%Sep 136%Sep 136%Sep 3033%Sep 3033%Sep 2133%Sep 2133%mixedrainsnow
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 Nanortalik is gradually decreasing, starting the month at 4.3 inches, when it rarely exceeds 7.6 inches or falls below 1.4 inches, and ending the month at 3.8 inches, when it rarely exceeds 7.3 inches or falls below 1.4 inches.

The highest average 31-day accumulation is 4.4 inches on September 7.

Average Monthly Rainfall in September in Nanortalik

Average Monthly Rainfall in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 in8 in8 inAugOctSep 64.4 inSep 64.4 inSep 303.8 inSep 303.8 inSep 214.2 inSep 214.2 in
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.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during September in Nanortalik is gradually increasing, starting the month at 0.1 inches, when it rarely exceeds 0.1 inches or falls below -0.0 inches, and ending the month at 1.0 inches, when it rarely exceeds 3.4 inches or falls below -0.0 inches.

Average Monthly Snowfall in September in Nanortalik

The average snowfall (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 rainfall.

Over the course of September in Nanortalik, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2 hours, 37 minutes, implying an average daily decrease of 5 minutes, 25 seconds, and weekly decrease of 37 minutes, 55 seconds.

The shortest day of the month is September 30, with 11 hours, 29 minutes of daylight and the longest day is September 1, with 14 hours, 6 minutes of daylight.

Hours of Daylight and Twilight in September in Nanortalik

Hours of Daylight and Twilight in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 18 minSep 2212 hr, 18 minnightnightdaydaySep 114 hr, 6 minSep 114 hr, 6 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 earliest sunrise of the month in Nanortalik is 6:56 AM on September 1 and the latest sunrise is 1 hour, 9 minutes later at 8:05 AM on September 30.

The latest sunset is 9:03 PM on September 1 and the earliest sunset is 1 hour, 28 minutes earlier at 7:34 PM on September 30.

Daylight saving time is observed in Nanortalik during 2024, but it neither starts nor ends during September, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 4:34 AM and sets 18 hours, 55 minutes later, at 11:30 PM, while on December 21, the shortest day of the year, it rises at 10:04 AM and sets 5 hours, 49 minutes later, at 3:54 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in September in Nanortalik

Sunrise & Sunset with Twilight and Daylight Saving Time in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMAugOct6:56 AM6:56 AMSep 19:03 PMSep 19:03 PM8:05 AM8:05 AMSep 307:34 PMSep 307:34 PM7:20 AM7:20 AMSep 118:32 PMSep 118:32 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 Nanortalik

Solar Elevation and Azimuth in September in NanortalikSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct0010102020304000101020203030
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 Nanortalik

Moon Rise, Set & Phases in September in NanortalikSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 410:14 AMAug 410:14 AMAug 195:26 PMAug 195:26 PMSep 312:56 AMSep 312:56 AMSep 181:35 AMSep 181:35 AMOct 25:50 PMOct 25:50 PMOct 1710:27 AMOct 1710:27 AM5:03 AM5:03 AM11:00 PM11:00 PM10:05 PM10:05 PM7:12 AM7:12 AM5:50 AM5:50 AM9:11 PM9:11 PM8:15 PM8:15 PM8:05 AM8:05 AM7:47 AM7:47 AM7:19 PM7:19 PM6:25 PM6:25 PM8:56 AM8:56 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
2%4:19 AMNE9:13 PMWNW-12:57 PMS248,995 mi
2
0%5:50 AMENE9:11 PMWNW-1:39 PMS250,430 mi
3
0%7:16 AMENE9:10 PMW-2:19 PMS251,508 mi
4
2%8:39 AME9:08 PMW-2:58 PMS252,187 mi
5
6%10:01 AME9:06 PMWSW-3:36 PMS252,405 mi
6
12%11:24 AMESE9:04 PMWSW-4:15 PMS252,088 mi
7
18%12:49 PMESE9:03 PMSW-4:57 PMS251,161 mi
8
27%2:20 PMSE9:02 PMSW-5:42 PMS249,564 mi
9
36%3:56 PMSE9:04 PMSSW-6:30 PMS247,269 mi
10
46%5:36 PMSSE9:11 PMSSW-7:24 PMS244,303 mi
11
50%7:06 PMSSE9:37 PMSSW-8:21 PMS240,762 mi
12
67%7:56 PMSSE10:48 PMSSW-9:22 PMS236,828 mi
13
77%8:11 PMSSE--10:23 PMS232,770 mi
14
87%-12:35 AMSSW8:16 PMSE11:23 PMS228,923 mi
15
90%-2:31 AMSW8:17 PMSE--
16
94%-4:25 AMWSW8:16 PMESE12:20 AMS225,654 mi
17
98%-6:16 AMWSW8:15 PME1:14 AMS223,302 mi
18
100%-8:05 AMW8:13 PME2:06 AMS222,120 mi
19
98%-9:54 AMWNW8:12 PMENE2:57 AMS222,228 mi
20
94%-11:44 AMWNW8:11 PMNE3:48 AMS223,590 mi
21
86%-1:39 PMNW8:12 PMNE4:40 AMS226,022 mi
22
77%-3:36 PMNNW8:15 PMNNE5:35 AMS229,238 mi
23
66%-5:27 PMNNW8:28 PMNNE6:32 AMS232,900 mi
24
50%-6:46 PMNNW9:13 PMNNE7:30 AMS236,679 mi
25
44%-7:16 PMNNW10:41 PMNNE8:27 AMS240,299 mi
26
33%-7:24 PMNNW-9:21 AMS243,560 mi
27
24%12:23 AMNNE7:26 PMNW-10:10 AMS246,343 mi
28
16%2:02 AMNE7:26 PMNW-10:56 AMS248,598 mi
29
9%3:34 AMENE7:25 PMWNW-11:39 AMS250,322 mi
30
4%5:01 AMENE7:23 PMWNW-12:19 PMS251,539 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 Nanortalik is essentially constant during September, remaining around 0% throughout.

Humidity Comfort Levels in September in Nanortalik

Humidity Comfort Levels in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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%drydry
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 Nanortalik is increasing during September, increasing from 11.7 miles per hour to 13.6 miles per hour over the course of the month.

For reference, on January 13, the windiest day of the year, the daily average wind speed is 21.2 miles per hour, while on July 25, the calmest day of the year, the daily average wind speed is 9.4 miles per hour.

Average Wind Speed in September in Nanortalik

Average Wind Speed in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mphAugOctSep 111.7 mphSep 111.7 mphSep 3013.6 mphSep 3013.6 mphSep 1612.8 mphSep 1612.8 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Nanortalik throughout September is predominantly from the west, with a peak proportion of 45% on September 18.

Wind Direction in September in Nanortalik

Wind Direction in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwesteastnorthsouth
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).

Nanortalik 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 surface water temperature in Nanortalik is essentially constant during September, remaining within 1°F of 38°F throughout.

Average Water Temperature in September in Nanortalik

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

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).

The growing season in Nanortalik typically lasts for 2.2 months (68 days), from around July 16 to around September 22, rarely starting before June 14, or ending after October 18.

During September in Nanortalik, the chance that a given day is within the growing season is rapidly decreasing falling from 75% to 34% over the course of the month.

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

Time Spent in Various Temperature Bands and the Growing Season in September in Nanortalikgrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct75%Sep 175%Sep 1Sep 3034%Sep 3034%67%Sep 1167%Sep 1152%Sep 2152%Sep 21Oct 1810%Oct 1810%Aug 2077%Aug 2077%freezingvery coldcold
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 Nanortalik are essentially constant during September, remaining within 1°F of 12°F throughout.

Growing Degree Days in September in Nanortalik

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 Nanortalik is decreasing during September, falling by 1.2 kWh, from 3.2 kWh to 2.0 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September in Nanortalik

Average Daily Incident Shortwave Solar Energy in September in NanortalikSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhAugOctSep 13.2 kWhSep 13.2 kWhSep 302.0 kWhSep 302.0 kWhSep 112.8 kWhSep 112.8 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 Nanortalik are 60.143 deg latitude, -45.237 deg longitude, and 13 ft elevation.

The topography within 2 miles of Nanortalik contains very significant variations in elevation, with a maximum elevation change of 1,634 feet and an average elevation above sea level of 155 feet. Within 10 miles contains very significant variations in elevation (3,822 feet). Within 50 miles also contains extreme variations in elevation (7,507 feet).

The area within 2 miles of Nanortalik is covered by sparse vegetation (42%), water (35%), and trees (14%), within 10 miles by water (56%) and sparse vegetation (27%), and within 50 miles by water (61%) and snow and glaciers (16%).

This report illustrates the typical weather in Nanortalik, 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Nanortalik.

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

The estimated value at Nanortalik is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Nanortalik and a given station.

The stations contributing to this reconstruction are:

  • Angisoq (BGAS, 90%, 11 mi, south, 39 ft elevation change)
  • Julianehaab (BGJH, 10%, 48 mi, northwest, 98 ft elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Nanortalik and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

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.

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 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.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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