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September Weather in Akutan Alaska, United States

Daily high temperatures decrease by 5°F, from 53°F to 48°F, rarely falling below 45°F or exceeding 58°F.

Daily low temperatures decrease by 4°F, from 47°F to 43°F, rarely falling below 39°F or exceeding 51°F.

For reference, on August 13, the hottest day of the year, temperatures in Akutan typically range from 48°F to 54°F, while on January 23, the coldest day of the year, they range from 31°F to 36°F.

Average High and Low Temperature in September in Akutan

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 Akutan

Average Hourly Temperature in September in AkutanSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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.

Ólafsvík, Iceland (3,975 miles away) is the far-away foreign place with temperatures most similar to Akutan (view comparison).

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The month of September in Akutan experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 68% to 59%.

The clearest day of the month is September 29, with clear, mostly clear, or partly cloudy conditions 41% of the time.

For reference, on July 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on October 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 44%.

Cloud Cover Categories in September in Akutan

Cloud Cover Categories in September in AkutanSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 132%Sep 132%Sep 3041%Sep 3041%Sep 1136%Sep 1136%Sep 2139%Sep 2139%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 Akutan, the chance of a wet day over the course of September is essentially constant, remaining around 38% throughout.

For reference, the year's highest daily chance of a wet day is 47% on December 16, and its lowest chance is 24% on May 4.

Probability of Precipitation in September in Akutan

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 Akutan is gradually increasing, starting the month at 3.1 inches, when it rarely exceeds 4.7 inches or falls below 1.6 inches, and ending the month at 3.5 inches, when it rarely exceeds 5.4 inches or falls below 1.6 inches.

Average Monthly Rainfall in September in Akutan

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 Akutan, 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, 4 minutes, implying an average daily decrease of 4 minutes, 17 seconds, and weekly decrease of 30 minutes, 0 seconds.

The shortest day of the month is September 30, with 11 hours, 35 minutes of daylight and the longest day is September 1, with 13 hours, 39 minutes of daylight.

Hours of Daylight and Twilight in September in Akutan

Hours of Daylight and Twilight in September in AkutanSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 14 minSep 2212 hr, 14 minnightnightdaydaySep 113 hr, 39 minSep 113 hr, 39 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 Akutan is 8:12 AM on September 1 and the latest sunrise is 52 minutes later at 9:04 AM on September 30.

The latest sunset is 9:51 PM on September 1 and the earliest sunset is 1 hour, 12 minutes earlier at 8:39 PM on September 30.

Daylight saving time is observed in Akutan 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 6:29 AM and sets 17 hours, 11 minutes later, at 11:40 PM, while on December 21, the shortest day of the year, it rises at 10:21 AM and sets 7 hours, 21 minutes later, at 5:41 PM.

Sunrise & Sunset with Twilight in September in Akutan

Sunrise & Sunset with Twilight in September in AkutanSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930304 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMAugOct8:12 AM8:12 AMSep 19:51 PMSep 19:51 PM9:04 AM9:04 AMSep 308:39 PMSep 308:39 PM8:30 AM8:30 AMSep 119:27 PMSep 119:27 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 Akutan

Solar Elevation and Azimuth in September in AkutanSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct00101020202030405000010102020303040
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 Akutan

Moon Rise, Set & Phases in September in AkutanSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 43:14 AMAug 43:14 AMAug 1910:26 AMAug 1910:26 AMSep 25:56 PMSep 25:56 PMSep 176:35 PMSep 176:35 PMOct 210:50 AMOct 210:50 AMOct 173:27 AMOct 173:27 AM5:56 AM5:56 AM11:20 PM11:20 PM10:34 PM10:34 PM7:29 AM7:29 AM7:41 AM7:41 AM10:00 PM10:00 PM9:14 PM9:14 PM9:40 AM9:40 AM9:10 AM9:10 AM8:30 PM8:30 PM7:39 PM7:39 PM10:14 AM10:14 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
1%6:24 AMENE9:52 PMWNW-2:15 PMS249,515 mi
2
0%7:41 AMENE10:00 PMWNW-2:56 PMS250,834 mi
3
1%8:56 AME10:07 PMW-3:35 PMS251,784 mi
4
3%10:09 AME10:13 PMW-4:14 PMS252,315 mi
5
8%11:22 AME10:20 PMWSW-4:52 PMS252,362 mi
6
14%12:35 PMESE10:27 PMWSW-5:32 PMS251,848 mi
7
21%1:51 PMESE10:37 PMWSW-6:15 PMS250,702 mi
8
30%3:10 PMSE10:51 PMSW-7:00 PMS248,871 mi
9
39%4:30 PMSE11:11 PMSW-7:50 PMS246,346 mi
10
50%5:47 PMSE11:43 PMSW-8:45 PMS243,174 mi
11
60%6:53 PMSE--9:43 PMS239,477 mi
12
71%-12:33 AMSW7:43 PMSE10:44 PMS235,469 mi
13
81%-1:45 AMSW8:17 PMSE11:45 PMS231,442 mi
14
85%-3:13 AMSW8:38 PMSE--
15
89%-4:49 AMSW8:53 PMESE12:43 AMS227,749 mi
16
96%-6:27 AMWSW9:04 PMESE1:39 AMS224,752 mi
17
100%-8:04 AMW9:14 PME2:32 AMS222,769 mi
18
100%-9:40 AMW9:23 PME3:23 AMS222,011 mi
19
97%-11:17 AMWNW9:33 PMENE4:14 AMS222,549 mi
20
91%-12:55 PMWNW9:46 PMENE5:06 AMS224,295 mi
21
83%-2:33 PMNW10:04 PMNE5:59 AMS227,025 mi
22
73%-4:07 PMNW10:31 PMNE6:56 AMS230,430 mi
23
62%-5:28 PMNW11:13 PMNE7:53 AMS234,167 mi
24
50%-6:30 PMNW-8:52 AMS237,921 mi
25
40%12:14 AMNE7:10 PMNW-9:48 AMS241,439 mi
26
30%1:29 AMNE7:35 PMNW-10:41 AMS244,550 mi
27
21%2:50 AMNE7:51 PMNW-11:29 AMS247,159 mi
28
13%4:11 AMENE8:02 PMWNW-12:14 PMS249,235 mi
29
7%5:29 AMENE8:11 PMWNW-12:56 PMS250,785 mi
30
3%6:44 AMENE8:17 PMW-1:35 PMS251,840 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 Akutan is essentially constant during September, remaining around 0% throughout.

Humidity Comfort Levels in September in Akutan

Humidity Comfort Levels in September in AkutanSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 Akutan is rapidly increasing during September, increasing from 14.3 miles per hour to 18.3 miles per hour over the course of the month.

For reference, on November 24, the windiest day of the year, the daily average wind speed is 21.3 miles per hour, while on July 16, the calmest day of the year, the daily average wind speed is 11.2 miles per hour.

Average Wind Speed in September in Akutan

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 Akutan throughout September is predominantly from the west, with a peak proportion of 42% on September 2.

Wind Direction in September in Akutan

Wind Direction in September in AkutanSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwestsouthnortheast
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).

Akutan 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 Akutan is gradually decreasing during September, falling by 2°F, from 49°F to 47°F, over the course of the month.

Average Water Temperature in September in Akutan

Average Water Temperature in September in AkutanSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303043°F43°F44°F44°F45°F45°F46°F46°F47°F47°F48°F48°F49°F49°F50°F50°F51°F51°F52°F52°FAugOctSep 149°FSep 149°FSep 3047°FSep 3047°FSep 1148°FSep 1148°FSep 2147°FSep 2147°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 in Akutan typically lasts for 6.6 months (201 days), from around April 27 to around November 14, rarely starting before April 8 or after May 15, and rarely ending before October 23 or after December 11.

The month of September in Akutan is reliably fully within the growing season.

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

Time Spent in Various Temperature Bands and the Growing Season in September in Akutangrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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 1690%Oct 2390%Oct 23Aug 1100%Aug 1100%very coldcoldcool
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 Akutan are essentially constant during September, remaining within 9°F of 85°F throughout.

Growing Degree Days in September in Akutan

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 Akutan is decreasing during September, falling by 1.0 kWh, from 3.3 kWh to 2.3 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September in Akutan

Average Daily Incident Shortwave Solar Energy in September in AkutanSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 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 13.3 kWhSep 13.3 kWhSep 302.3 kWhSep 302.3 kWhSep 112.9 kWhSep 112.9 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 Akutan are 54.136 deg latitude, -165.773 deg longitude, and 141 ft elevation.

The topography within 2 miles of Akutan contains very significant variations in elevation, with a maximum elevation change of 1,821 feet and an average elevation above sea level of 470 feet. Within 10 miles contains very significant variations in elevation (4,180 feet). Within 50 miles also contains extreme variations in elevation (5,833 feet).

The area within 2 miles of Akutan is covered by water (40%) and shrubs (34%), within 10 miles by water (62%) and shrubs (19%), and within 50 miles by water (90%).

This report illustrates the typical weather in Akutan, 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 Akutan.

For each station, the records are corrected for the elevation difference between that station and Akutan 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 Akutan is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Akutan and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Akutan 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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