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September Weather at Vestmannaeyjar Airport Iceland

Daily high temperatures decrease by 5°F, from 52°F to 47°F, rarely falling below 42°F or exceeding 56°F.

Daily low temperatures decrease by 5°F, from 47°F to 43°F, rarely falling below 37°F or exceeding 51°F.

For reference, on July 31, the hottest day of the year, temperatures at Vestmannaeyjar Airport typically range from 50°F to 55°F, while on March 7, the coldest day of the year, they range from 33°F to 39°F.

Average High and Low Temperature in September at Vestmannaeyjar Airport

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 Vestmannaeyjar Airport

Average Hourly Temperature in September at Vestmannaeyjar AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 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.

Dutch Harbor, Alaska, United States (4,135 miles away) is the far-away foreign place with temperatures most similar to Vestmannaeyjar Airport (view comparison).

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The month of September at Vestmannaeyjar Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 64% throughout the month. The highest chance of overcast or mostly cloudy conditions is 65% on September 17.

The clearest day of the month is September 26, with clear, mostly clear, or partly cloudy conditions 37% of the time.

For reference, on February 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on May 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 43%.

Cloud Cover Categories in September at Vestmannaeyjar Airport

Cloud Cover Categories in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctMay 543%May 543%Sep 136%Sep 136%Sep 3036%Sep 3036%Sep 1135%Sep 1135%Sep 2136%Sep 2136%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 Vestmannaeyjar Airport, the chance of a wet day over the course of September is gradually increasing, starting the month at 45% and ending it at 48%.

For reference, the year's highest daily chance of a wet day is 59% on February 28, and its lowest chance is 29% on May 26.

Probability of Precipitation in September at Vestmannaeyjar Airport

Probability of Precipitation in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%AugOctSep 145%Sep 145%Sep 3048%Sep 3048%Sep 1148%Sep 1148%Sep 2148%Sep 2148%rain
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 Vestmannaeyjar Airport is increasing, starting the month at 4.4 inches, when it rarely exceeds 6.8 inches or falls below 2.4 inches, and ending the month at 5.2 inches, when it rarely exceeds 8.4 inches or falls below 2.9 inches.

Average Monthly Rainfall in September at Vestmannaeyjar Airport

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 at Vestmannaeyjar Airport, 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 3 hours, 1 minute, implying an average daily decrease of 6 minutes, 14 seconds, and weekly decrease of 43 minutes, 39 seconds.

The shortest day of the month is September 30, with 11 hours, 25 minutes of daylight and the longest day is September 1, with 14 hours, 26 minutes of daylight.

Hours of Daylight and Twilight in September at Vestmannaeyjar Airport

Hours of Daylight and Twilight in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 15 minSep 2212 hr, 15 minnightnightdaydaySep 114 hr, 26 minSep 114 hr, 26 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 Vestmannaeyjar Airport is 6:07 AM on September 1 and the latest sunrise is 1 hour, 21 minutes later at 7:27 AM on September 30.

The latest sunset is 8:32 PM on September 1 and the earliest sunset is 1 hour, 40 minutes earlier at 6:52 PM on September 30.

Daylight saving time is not observed at Vestmannaeyjar Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 3:05 AM and sets 20 hours, 36 minutes later, at 11:40 PM, while on December 21, the shortest day of the year, it rises at 11:04 AM and sets 4 hours, 30 minutes later, at 3:34 PM.

Sunrise & Sunset with Twilight in September at Vestmannaeyjar Airport

Sunrise & Sunset with Twilight in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:07 AM6:07 AMSep 18:32 PMSep 18:32 PM7:27 AM7:27 AMSep 306:52 PMSep 306:52 PM6:35 AM6:35 AMSep 117:58 PMSep 117:58 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 at Vestmannaeyjar Airport

Solar Elevation and Azimuth in September at Vestmannaeyjar AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct0010102020300001010202030
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 Vestmannaeyjar Airport

Moon Rise, Set & Phases in September at Vestmannaeyjar AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 411:14 AMAug 411:14 AMAug 196:26 PMAug 196:26 PMSep 31:56 AMSep 31:56 AMSep 182:35 AMSep 182:35 AMOct 26:50 PMOct 26:50 PMOct 1711:27 AMOct 1711:27 AM3:36 AM3:36 AM10:47 PM10:47 PM9:42 PM9:42 PM6:09 AM6:09 AM6:21 AM6:21 AM8:35 PM8:35 PM7:40 PM7:40 PM7:16 AM7:16 AM7:03 AM7:03 AM6:35 PM6:35 PM5:39 PM5:39 PM8:21 AM8:21 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
2%3:04 AMNE8:53 PMNW-12:14 PMS248,882 mi
2
0%4:46 AMENE8:44 PMWNW-12:56 PMS250,341 mi
3
0%6:21 AMENE8:35 PMWNW-1:36 PMS251,445 mi
4
2%7:51 AME8:28 PMW-2:14 PMS252,154 mi
5
6%9:19 AME8:20 PMWSW-2:52 PMS252,407 mi
6
11%10:49 AMESE8:12 PMWSW-3:32 PMS252,129 mi
7
18%12:23 PMSE8:02 PMSW-4:13 PMS251,247 mi
8
26%2:05 PMSE7:50 PMSW-4:58 PMS249,698 mi
9
35%4:02 PMSSE7:31 PMSSW-5:46 PMS247,451 mi
10
45%6:40 PMS244,530 mi
11
50%7:37 PMS241,023 mi
12
67%8:38 PMS237,108 mi
13
77%9:00 PMS10:19 PMS-9:40 PMS233,047 mi
14
86%8:17 PMSSE--10:40 PMS229,173 mi
15
93%-1:04 AMSSW8:01 PMSE11:37 PMS225,853 mi
16
96%-3:16 AMSW7:50 PMESE--
17
98%-5:18 AMWSW7:40 PME12:32 AMS223,428 mi
18
100%-7:16 AMW7:31 PME1:24 AMS222,161 mi
19
99%-9:14 AMWNW7:22 PMENE2:14 AMS222,180 mi
20
94%-11:15 AMWNW7:11 PMNE3:05 AMS223,459 mi
21
87%-1:24 PMNW6:57 PMNE3:58 AMS225,826 mi
22
77%-3:53 PMNNW6:30 PMNNE4:52 AMS228,999 mi
23
67%5:49 AMS232,640 mi
24
50%6:47 AMS236,420 mi
25
44%7:43 AMS240,057 mi
26
34%-7:46 PMNNW10:35 PMNNE8:37 AMS243,347 mi
27
25%-7:22 PMNW-9:27 AMS246,166 mi
28
16%12:41 AMNE7:09 PMNW-10:13 AMS248,458 mi
29
10%2:27 AMNE6:59 PMWNW-10:55 AMS250,218 mi
30
5%4:03 AMENE6:51 PMWNW-11:35 AMS251,470 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 Vestmannaeyjar Airport is essentially constant during September, remaining around 0% throughout.

Humidity Comfort Levels in September at Vestmannaeyjar Airport

Humidity Comfort Levels in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 Vestmannaeyjar Airport is rapidly increasing during September, increasing from 14.4 miles per hour to 16.6 miles per hour over the course of the month.

For reference, on December 30, the windiest day of the year, the daily average wind speed is 21.0 miles per hour, while on July 12, the calmest day of the year, the daily average wind speed is 11.6 miles per hour.

Average Wind Speed in September at Vestmannaeyjar Airport

Average Wind Speed in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphAugOctSep 114.4 mphSep 114.4 mphSep 3016.6 mphSep 3016.6 mphSep 1615.9 mphSep 1615.9 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 at Vestmannaeyjar Airport throughout September is predominantly from the east, with a peak proportion of 34% on September 30.

Wind Direction in September at Vestmannaeyjar Airport

Wind Direction in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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).

Vestmannaeyjar Airport 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 Vestmannaeyjar Airport is gradually decreasing during September, falling by 3°F, from 52°F to 49°F, over the course of the month.

Average Water Temperature in September at Vestmannaeyjar Airport

Average Water Temperature in September at Vestmannaeyjar AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303044°F44°F46°F46°F48°F48°F50°F50°F52°F52°F54°F54°F56°F56°FAugOctSep 152°FSep 152°FSep 3049°FSep 3049°FSep 1151°FSep 1151°FSep 2150°FSep 2150°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 Vestmannaeyjar Airport typically lasts for 5.9 months (179 days), from around April 26 to around October 21, rarely starting before April 4 or after May 16, and rarely ending before October 1 or after November 12.

The month of September at Vestmannaeyjar Airport is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 91% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in September at Vestmannaeyjar Airport

Time Spent in Various Temperature Bands and the Growing Season in September at Vestmannaeyjar Airportgrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 1100%Sep 191%Sep 3091%Sep 30100%Sep 11100%Sep 1198%Sep 2198%Sep 2150%Oct 2150%Oct 21very coldcoldcoolfreezing
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 Vestmannaeyjar Airport are essentially constant during September, remaining within 9°F of 157°F throughout.

Growing Degree Days in September at Vestmannaeyjar Airport

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 Vestmannaeyjar Airport is decreasing during September, falling by 1.4 kWh, from 2.8 kWh to 1.5 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September at Vestmannaeyjar Airport

Average Daily Incident Shortwave Solar Energy in September at Vestmannaeyjar AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWhAugOctSep 12.8 kWhSep 12.8 kWhSep 301.5 kWhSep 301.5 kWhSep 112.3 kWhSep 112.3 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 Vestmannaeyjar Airport are 63.424 deg latitude, -20.279 deg longitude, and 276 ft elevation.

The topography within 2 miles of Vestmannaeyjar Airport contains very significant variations in elevation, with a maximum elevation change of 860 feet and an average elevation above sea level of 89 feet. Within 10 miles also contains very significant variations in elevation (919 feet). Within 50 miles contains very significant variations in elevation (5,410 feet).

The area within 2 miles of Vestmannaeyjar Airport is covered by water (51%) and shrubs (16%), within 10 miles by water (95%), and within 50 miles by water (68%) and shrubs (10%).

This report illustrates the typical weather at Vestmannaeyjar Airport, 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

Vestmannaeyjar Airport 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.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Reykjavik Airport and Keflavík International Airport.

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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