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September Weather at Svalbard Airport, Longyear Svalbard & Jan Mayen

Daily high temperatures decrease by 8°F, from 41°F to 33°F, rarely falling below 25°F or exceeding 48°F.

Daily low temperatures decrease by 9°F, from 36°F to 27°F, rarely falling below 18°F or exceeding 42°F.

For reference, on July 21, the hottest day of the year, temperatures at Svalbard Airport, Longyear typically range from 42°F to 48°F, while on February 18, the coldest day of the year, they range from 4°F to 15°F.

Average High and Low Temperature in September at Svalbard Airport, Longyear

Average High and Low Temperature in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300°F0°F5°F5°F10°F10°F15°F15°F20°F20°F25°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°FAugOctSep 141°FSep 141°F36°F36°FSep 3033°FSep 3033°F27°F27°FSep 1139°FSep 1139°F33°F33°FSep 2136°FSep 2136°F30°F30°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 at Svalbard Airport, Longyear

Average Hourly Temperature in September at Svalbard Airport, LongyearSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOctfreezingvery 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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Big Sky, Montana, United States (3,626 miles away); Sŭngjibaegam, North Korea (3,750 miles); and Petropavlovsk-Kamchatsky, Russia (3,238 miles) are the far-away foreign places with temperatures most similar to Svalbard Airport, Longyear (view comparison).

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The month of September at Svalbard Airport, Longyear experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 73% throughout the month.

The clearest day of the month is September 7, with clear, mostly clear, or partly cloudy conditions 28% of the time.

For reference, on January 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on May 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 41%.

Cloud Cover Categories in September at Svalbard Airport, Longyear

Cloud Cover Categories in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 128%Sep 128%Sep 3025%Sep 3025%Sep 1128%Sep 1128%Sep 2126%Sep 2126%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. At Svalbard Airport, Longyear, the chance of a wet day over the course of September is essentially constant, remaining around 26% throughout.

For reference, the year's highest daily chance of a wet day is 27% on September 24, and its lowest chance is 9% on May 28.

Over the course of September at Svalbard Airport, Longyear, the chance of a day with only rain decreases from 25% to 16%, the chance of a day with mixed snow and rain increases from 1% to 5%, and the chance of a day with only snow increases from 0% to 5%.

Probability of Precipitation in September at Svalbard Airport, Longyear

Probability of Precipitation in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%AugOctSep 2427%Sep 2427%Sep 125%Sep 125%Sep 1126%Sep 1126%snowmixedrain
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 at Svalbard Airport, Longyear is essentially constant, remaining about 1.3 inches throughout, and rarely exceeding 2.7 inches or falling below 0.2 inches.

The highest average 31-day accumulation is 1.5 inches on September 12.

Average Monthly Rainfall in September at Svalbard Airport, Longyear

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 at Svalbard Airport, Longyear is rapidly increasing, starting the month at 0.4 inches, when it rarely exceeds 1.4 inches or falls below -0.0 inches, and ending the month at 3.7 inches, when it rarely exceeds 8.1 inches or falls below 0.4 inches.

Average Monthly Snowfall in September at Svalbard Airport, Longyear

Average Monthly Snowfall in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 in16 in16 inAugOctSep 10.4 inSep 10.4 inSep 303.7 inSep 303.7 inSep 111.1 inSep 111.1 inSep 212.3 inSep 212.3 in
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.

Due to its extreme latitude, Svalbard Airport, Longyear experiences polar day (also known as the midnight Sun) during the summer and polar night during the winter. These are periods of time in which the sun is continuously above or below the horizon for more than one day. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.

Neither polar day nor polar night occur during the month of September.

Over the course of September at Svalbard Airport, Longyear, 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 7 hours, 54 minutes, implying an average daily decrease of 16 minutes, 20 seconds, and weekly decrease of 1 hour, 54 minutes, 23 seconds.

The shortest day of the month is September 30, with 10 hours, 33 minutes of daylight and the longest day is September 1, with 18 hours, 27 minutes of daylight.

Hours of Daylight and Twilight in September at Svalbard Airport, Longyear

Hours of Daylight and Twilight in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 34 minSep 2212 hr, 34 minSep 118 hr, 27 minSep 118 hr, 27 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 at Svalbard Airport, Longyear is 3:40 AM on September 1 and the latest sunrise is 3 hours, 49 minutes later at 7:29 AM on September 30.

The latest sunset is 10:07 PM on September 1 and the earliest sunset is 4 hours, 4 minutes earlier at 6:03 PM on September 30.

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

Sunrise & Sunset with Twilight and Daylight Saving Time in September at Svalbard Airport, Longyear

Sunrise & Sunset with Twilight and Daylight Saving Time in September at Svalbard Airport, LongyearSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct3:40 AM3:40 AMSep 110:07 PMSep 110:07 PM7:29 AM7:29 AMSep 306:03 PMSep 306:03 PM5:10 AM5:10 AMSep 118:33 PMSep 118:33 PMSolarMidnightSolarMidnightSolarNoon
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 at Svalbard Airport, Longyear

Solar Elevation and Azimuth in September at Svalbard Airport, LongyearSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct00102001020
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 at Svalbard Airport, Longyear

Moon Rise, Set & Phases in September at Svalbard Airport, LongyearSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 41:14 PMAug 41:14 PMSep 33:56 AMSep 33:56 AMSep 184:35 AMSep 184:35 AMOct 28:50 PMOct 28:50 PMOct 171:27 PMOct 171:27 PM12:00 AM12:00 AM12:00 AM12:00 AM3:20 AM3:20 AM9:19 PM9:19 PM8:19 PM8:19 PM6:16 AM6:16 AM6:42 AM6:42 AM5:33 PM5:33 PM1:55 PM1:55 PM12:00 AM12:00 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
3%11:38 AMS248,709 mi
2
0%-11:09 PMNNW-12:19 PMS250,203 mi
3
0%3:20 AMNE9:19 PMWNW-12:58 PMS251,346 mi
4
2%6:39 AMENE8:07 PMW-1:37 PMS252,099 mi
5
5%9:24 AMESE6:55 PMWSW-2:15 PMS252,404 mi
6
10%12:37 PMSE5:11 PMSSW-2:55 PMS252,186 mi
7
17%3:37 PMS251,371 mi
8
25%4:22 PMS249,893 mi
9
34%5:12 PMS247,717 mi
10
44%6:07 PMS244,857 mi
11
50%7:07 PMS241,397 mi
12
65%8:11 PMS237,503 mi
13
76%9:16 PMS233,434 mi
14
85%10:19 PMS229,518 mi
15
93%11:20 PMS226,125 mi
16
96%10:53 PMSSE----
17
98%-1:41 AMSSW8:19 PMESE12:17 AMS223,603 mi
18
100%-6:16 AMW6:50 PME1:10 AMS222,223 mi
19
99%-10:03 AMWNW5:08 PMNE2:00 AMS222,125 mi
20
95%2:50 AMS223,295 mi
21
87%3:41 AMS225,571 mi
22
78%4:32 AMS228,676 mi
23
68%5:26 AMS232,280 mi
24
50%6:20 AMS236,051 mi
25
45%7:13 AMS239,705 mi
26
35%8:04 AMS243,031 mi
27
25%8:52 AMS245,897 mi
28
17%9:37 AMS248,242 mi
29
10%10:19 AMS250,056 mi
30
5%-8:00 PMNW-10:58 AMS251,360 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 at Svalbard Airport, Longyear is essentially constant during September, remaining around 0% throughout.

Humidity Comfort Levels in September at Svalbard Airport, Longyear

Humidity Comfort Levels in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 at Svalbard Airport, Longyear is increasing during September, increasing from 8.2 miles per hour to 9.8 miles per hour over the course of the month.

For reference, on January 2, the windiest day of the year, the daily average wind speed is 13.5 miles per hour, while on June 20, the calmest day of the year, the daily average wind speed is 7.5 miles per hour.

Average Wind Speed in September at Svalbard Airport, Longyear

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 at Svalbard Airport, Longyear throughout September is predominantly from the east, with a peak proportion of 39% on September 28.

Wind Direction in September at Svalbard Airport, Longyear

Wind Direction in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwestsoutheastnorth
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).

Svalbard Airport, Longyear 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 at Svalbard Airport, Longyear is gradually decreasing during September, falling by 2°F, from 38°F to 35°F, over the course of the month.

Average Water Temperature in September at Svalbard Airport, Longyear

Average Water Temperature in September at Svalbard Airport, LongyearSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303030°F30°F32°F32°F34°F34°F36°F36°F38°F38°F40°F40°F42°F42°F44°F44°FAugOctSep 138°FSep 138°FSep 3035°FSep 3035°FSep 1137°FSep 1137°FSep 2136°FSep 2136°F
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 at Svalbard Airport, Longyear typically lasts for 3.0 months (92 days), from around June 7 to around September 7, rarely starting before May 22 or after June 24, and rarely ending before August 18 or after September 24.

During September at Svalbard Airport, Longyear, the chance that a given day is within the growing season is very rapidly decreasing falling from 66% to 3% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in September at Svalbard Airport, Longyear

Time Spent in Various Temperature Bands and the Growing Season in September at Svalbard Airport, Longyeargrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct66%Sep 166%Sep 1Sep 303%Sep 303%Sep 1139%Sep 1139%Sep 2115%Sep 2115%90%Aug 1890%Aug 18frigidfreezingvery 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 at Svalbard Airport, Longyear are essentially constant during September, remaining around 12°F throughout.

Growing Degree Days in September at Svalbard Airport, Longyear

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 at Svalbard Airport, Longyear is decreasing during September, falling by 1.3 kWh, from 1.7 kWh to 0.4 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September at Svalbard Airport, Longyear

Average Daily Incident Shortwave Solar Energy in September at Svalbard Airport, LongyearSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWh6.0 kWh6.0 kWhAugOctSep 11.7 kWhSep 11.7 kWhSep 300.4 kWhSep 300.4 kWhSep 111.2 kWhSep 111.2 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 Svalbard Airport, Longyear are 78.246 deg latitude, 15.466 deg longitude, and 92 ft elevation.

The topography within 2 miles of Svalbard Airport, Longyear contains very significant variations in elevation, with a maximum elevation change of 1,552 feet and an average elevation above sea level of 355 feet. Within 10 miles contains very significant variations in elevation (3,438 feet). Within 50 miles also contains extreme variations in elevation (4,117 feet).

The area within 2 miles of Svalbard Airport, Longyear is covered by water (78%) and sparse vegetation (13%), within 10 miles by water (49%) and snow and glaciers (35%), and within 50 miles by snow and glaciers (60%) and water (28%).

This report illustrates the typical weather at Svalbard Airport, Longyear, 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

Svalbard Airport, Longyear has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

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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