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September Weather at Chignik Airport Alaska, United States

Daily high temperatures decrease by 7°F, from 57°F to 50°F, rarely falling below 45°F or exceeding 61°F.

Daily low temperatures decrease by 6°F, from 49°F to 43°F, rarely falling below 37°F or exceeding 53°F.

For reference, on August 2, the hottest day of the year, temperatures at Chignik Airport typically range from 51°F to 59°F, while on February 7, the coldest day of the year, they range from 27°F to 34°F.

Average High and Low Temperature in September at Chignik Airport

Average High and Low Temperature in September at Chignik AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303025°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°FAugOctSep 157°FSep 157°F49°F49°FSep 3050°FSep 3050°F43°F43°FSep 1155°FSep 1155°F47°F47°FSep 2153°FSep 2153°F45°F45°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 Chignik Airport

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

Svolvær, Norway (3,828 miles away) is the far-away foreign place with temperatures most similar to Chignik Airport (view comparison).

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The month of September at Chignik Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 56% throughout the month.

The clearest day of the month is September 24, with clear, mostly clear, or partly cloudy conditions 45% of the time.

For reference, on January 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on October 11, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 46%.

Cloud Cover Categories in September at Chignik Airport

Cloud Cover Categories in September at Chignik AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 142%Sep 142%Sep 3045%Sep 3045%Sep 1143%Sep 1143%Sep 2144%Sep 2144%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 Chignik Airport, the chance of a wet day over the course of September is essentially constant, remaining around 40% throughout.

For reference, the year's highest daily chance of a wet day is 42% on September 17, and its lowest chance is 26% on May 9.

Probability of Precipitation in September at Chignik Airport

Probability of Precipitation in September at Chignik AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%AugOctSep 1742%Sep 1742%Sep 138%Sep 138%Sep 3040%Sep 3040%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 Chignik Airport is gradually increasing, starting the month at 3.1 inches, when it rarely exceeds 5.0 inches or falls below 1.6 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.4 inches or falls below 1.5 inches.

The highest average 31-day accumulation is 3.6 inches on September 20.

Average Monthly Rainfall in September at Chignik 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 Chignik 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 2 hours, 15 minutes, implying an average daily decrease of 4 minutes, 39 seconds, and weekly decrease of 32 minutes, 34 seconds.

The shortest day of the month is September 30, with 11 hours, 33 minutes of daylight and the longest day is September 1, with 13 hours, 48 minutes of daylight.

Hours of Daylight and Twilight in September at Chignik Airport

Hours of Daylight and Twilight in September at Chignik AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 15 minSep 2212 hr, 15 minnightnightdaydaySep 113 hr, 48 minSep 113 hr, 48 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 Chignik Airport is 7:38 AM on September 1 and the latest sunrise is 58 minutes later at 8:36 AM on September 30.

The latest sunset is 9:26 PM on September 1 and the earliest sunset is 1 hour, 17 minutes earlier at 8:08 PM on September 30.

Daylight saving time is observed at Chignik Airport 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 5:44 AM and sets 17 hours, 42 minutes later, at 11:26 PM, while on December 21, the shortest day of the year, it rises at 10:05 AM and sets 6 hours, 53 minutes later, at 4:58 PM.

Sunrise & Sunset with Twilight in September at Chignik Airport

Sunrise & Sunset with Twilight in September at Chignik AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930304 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMAugOct7:38 AM7:38 AMSep 19:26 PMSep 19:26 PM8:36 AM8:36 AMSep 308:08 PMSep 308:08 PM7:58 AM7:58 AMSep 118:59 PMSep 118:59 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 Chignik Airport

Solar Elevation and Azimuth in September at Chignik 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 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 at Chignik Airport

Moon Rise, Set & Phases in September at Chignik AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AM6:34 AM6:34 AM11:13 PM11:13 PM10:15 PM10:15 PM6:48 AM6:48 AM7:04 AM7:04 AM9:35 PM9:35 PM8:45 PM8:45 PM9:10 AM9:10 AM8:41 AM8:41 AM7:57 PM7:57 PM7:05 PM7:05 PM9:50 AM9:50 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%5:42 AMENE9:30 PMWNW-1:44 PMS249,484 mi
2
0%7:04 AMENE9:35 PMWNW-2:25 PMS250,810 mi
3
1%8:22 AME9:39 PMW-3:05 PMS251,768 mi
4
3%9:38 AME9:42 PMW-3:43 PMS252,309 mi
5
8%10:53 AME9:46 PMWSW-4:22 PMS252,367 mi
6
14%12:10 PMESE9:51 PMWSW-5:02 PMS251,865 mi
7
21%1:29 PMESE9:57 PMSW-5:44 PMS250,732 mi
8
29%2:52 PMSE10:07 PMSW-6:30 PMS248,917 mi
9
39%4:17 PMSE10:22 PMSW-7:20 PMS246,405 mi
10
50%5:38 PMSSE10:50 PMSSW-8:14 PMS243,245 mi
11
60%6:48 PMSSE11:38 PMSSW-9:13 PMS239,557 mi
12
71%7:36 PMSSE--10:13 PMS235,552 mi
13
80%-12:51 AMSSW8:04 PMSE11:14 PMS231,522 mi
14
85%-2:24 AMSW8:21 PMSE--
15
89%-4:06 AMSW8:32 PMESE12:13 AMS227,818 mi
16
95%-5:48 AMWSW8:39 PMESE1:09 AMS224,804 mi
17
100%-7:29 AMW8:45 PME2:02 AMS222,797 mi
18
100%-9:10 AMW8:51 PME2:53 AMS222,014 mi
19
97%-10:50 AMWNW8:57 PMENE3:44 AMS222,526 mi
20
91%-12:33 PMWNW9:06 PMNE4:35 AMS224,249 mi
21
83%-2:16 PMNW9:19 PMNE5:29 AMS226,962 mi
22
73%-3:55 PMNW9:41 PMNE6:25 AMS230,356 mi
23
62%-5:22 PMNNW10:18 PMNNE7:23 AMS234,089 mi
24
50%-6:23 PMNNW11:19 PMNNE8:21 AMS237,845 mi
25
40%-7:00 PMNW-9:17 AMS241,370 mi
26
30%12:37 AMNE7:21 PMNW-10:10 AMS244,490 mi
27
21%2:03 AMNE7:33 PMNW-10:59 AMS247,111 mi
28
14%3:28 AMNE7:41 PMWNW-11:43 AMS249,197 mi
29
8%4:50 AMENE7:46 PMWNW-12:25 PMS250,758 mi
30
3%6:09 AMENE7:50 PMW-1:04 PMS251,823 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 Chignik Airport is essentially constant during September, remaining around 0% throughout.

For reference, on August 10, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in September at Chignik Airport

Humidity Comfort Levels in September at Chignik AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 10%Sep 10%Sep 300%Sep 300%Sep 110%Sep 110%Sep 210%Sep 210%drydrycomfortablecomfortable
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 Chignik Airport is rapidly increasing during September, increasing from 11.4 miles per hour to 14.1 miles per hour over the course of the month.

For reference, on December 13, the windiest day of the year, the daily average wind speed is 16.7 miles per hour, while on July 12, the calmest day of the year, the daily average wind speed is 9.1 miles per hour.

Average Wind Speed in September at Chignik Airport

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 Chignik Airport throughout September is predominantly from the west, with a peak proportion of 40% on September 1.

Wind Direction in September at Chignik Airport

Wind Direction in September at Chignik AirportWNSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%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).

Chignik 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 Chignik Airport is gradually decreasing during September, falling by 2°F, from 52°F to 50°F, over the course of the month.

Average Water Temperature in September at Chignik Airport

Average Water Temperature in September at Chignik AirportSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303044°F44°F46°F46°F48°F48°F50°F50°F52°F52°F54°F54°F56°F56°FAugOctSep 152°FSep 152°FSep 3050°FSep 3050°FSep 1152°FSep 1152°FSep 2151°FSep 2151°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 Chignik Airport typically lasts for 5.7 months (175 days), from around April 30 to around October 22, rarely starting before April 11 or after May 19, and rarely ending before September 23 or after November 19.

The month of September at Chignik Airport is more likely than not fully within the growing season, with the chance that a given day is in the growing season decreasing from 98% to 84% over the course of the month.

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

Time Spent in Various Temperature Bands and the Growing Season in September at Chignik Airportgrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct98%Sep 198%Sep 184%Sep 3084%Sep 3096%Sep 1196%Sep 1191%Sep 2191%Sep 2150%Oct 2250%Oct 22very 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 Chignik Airport are gradually increasing during September, increasing by 51°F, from 288°F to 338°F, over the course of the month.

Growing Degree Days in September at Chignik 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 Chignik Airport is decreasing during September, falling by 1.3 kWh, from 3.4 kWh to 2.1 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September at Chignik Airport

Average Daily Incident Shortwave Solar Energy in September at Chignik AirportSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWhAugOctSep 13.4 kWhSep 13.4 kWhSep 302.1 kWhSep 302.1 kWhSep 113.0 kWhSep 113.0 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 Chignik Airport are 56.311 deg latitude, -158.374 deg longitude, and 26 ft elevation.

The topography within 2 miles of Chignik Airport contains very significant variations in elevation, with a maximum elevation change of 1,860 feet and an average elevation above sea level of 297 feet. Within 10 miles contains very significant variations in elevation (3,327 feet). Within 50 miles also contains extreme variations in elevation (8,264 feet).

The area within 2 miles of Chignik Airport is covered by water (61%) and shrubs (37%), within 10 miles by water (59%) and shrubs (32%), and within 50 miles by water (53%) and shrubs (35%).

This report illustrates the typical weather at Chignik 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

Chignik 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 Port Heiden Airport, Pilot Point Airport, Sand Point Airport, and Nelson Lagoon 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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