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August Weather in Grytviken South Georgia & South Sandwich Islands

Daily high temperatures are around 31°F, rarely falling below 26°F or exceeding 34°F.

Daily low temperatures are around 26°F, rarely falling below 20°F or exceeding 32°F.

For reference, on February 24, the hottest day of the year, temperatures in Grytviken typically range from 36°F to 40°F, while on July 23, the coldest day of the year, they range from 26°F to 31°F.

Average High and Low Temperature in August in Grytviken

Average High and Low Temperature in August in GrytvikenAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112°F12°F14°F14°F16°F16°F18°F18°F20°F20°F22°F22°F24°F24°F26°F26°F28°F28°F30°F30°F32°F32°F34°F34°F36°F36°FJulSepAug 131°FAug 131°F26°F26°FAug 3131°FAug 3131°F27°F27°FAug 1131°FAug 1131°F26°F26°FAug 2131°FAug 2131°F26°F26°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 August. 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 August in Grytviken

Average Hourly Temperature in August in GrytvikenAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSepfreezing
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.

Nanortalik, Greenland (7,929 miles away) is the far-away foreign place with temperatures most similar to Grytviken (view comparison).

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The month of August in Grytviken experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 75% throughout the month.

The clearest day of the month is August 31, with clear, mostly clear, or partly cloudy conditions 27% of the time.

For reference, on June 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on December 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 37%.

Cloud Cover Categories in August in Grytviken

Cloud Cover Categories in August in GrytvikenAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepAug 123%Aug 123%Aug 3127%Aug 3127%Aug 1125%Aug 1125%Aug 2126%Aug 2126%partly cloudymostly cloudyovercastmostly clearclear
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 Grytviken, the chance of a wet day over the course of August is essentially constant, remaining around 26% throughout.

For reference, the year's highest daily chance of a wet day is 44% on January 26, and its lowest chance is 21% on October 4.

Over the course of August in Grytviken, the chance of a day with only rain remains an essentially constant 9% throughout, the chance of a day with mixed snow and rain remains an essentially constant 9% throughout, and the chance of a day with only snow increases from 7% to 9%.

Probability of Precipitation in August in Grytviken

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 August in Grytviken is essentially constant, remaining about 0.7 inches throughout, and rarely exceeding 1.6 inches or falling below 0.2 inches.

The lowest average 31-day accumulation is 0.7 inches on August 3.

Average Monthly Rainfall in August in Grytviken

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 August in Grytviken is gradually increasing, starting the month at 5.3 inches, when it rarely exceeds 10.0 inches or falls below 1.5 inches, and ending the month at 6.2 inches, when it rarely exceeds 10.2 inches or falls below 1.9 inches.

Average Monthly Snowfall in August in Grytviken

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 August in Grytviken, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 56 minutes, implying an average daily increase of 3 minutes, 53 seconds, and weekly increase of 27 minutes, 10 seconds.

The shortest day of the month is August 1, with 8 hours, 41 minutes of daylight and the longest day is August 31, with 10 hours, 38 minutes of daylight.

Hours of Daylight and Twilight in August in Grytviken

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 latest sunrise of the month in Grytviken is 8:12 AM on August 1 and the earliest sunrise is 1 hour, 4 minutes earlier at 7:07 AM on August 31.

The earliest sunset is 4:53 PM on August 1 and the latest sunset is 52 minutes later at 5:45 PM on August 31.

Daylight saving time is not observed in Grytviken during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 3:48 AM and sets 17 hours, 13 minutes later, at 9:00 PM, while on June 20, the shortest day of the year, it rises at 8:48 AM and sets 7 hours, 19 minutes later, at 4:07 PM.

Sunrise & Sunset with Twilight in August in Grytviken

The solar day over the course of August. 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 August in Grytviken

Solar Elevation and Azimuth in August in GrytvikenAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSep00101020203000010102030
northeastsouthwest
Solar elevation and azimuth over the course of August 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 August 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 August in Grytviken

Moon Rise, Set & Phases in August in GrytvikenAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJulSepJul 58:58 PMJul 58:58 PMJul 218:18 AMJul 218:18 AMAug 49:14 AMAug 49:14 AMAug 194:26 PMAug 194:26 PMSep 211:56 PMSep 211:56 PMSep 1812:35 AMSep 1812:35 AM9:19 AM9:19 AM3:09 PM3:09 PM2:54 PM2:54 PM9:19 AM9:19 AM8:46 AM8:46 AM4:52 PM4:52 PM5:05 PM5:05 PM8:12 AM8:12 AM7:17 AM7:17 AM5:14 PM5:14 PM5:40 PM5:40 PM6:38 AM6:38 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.
Aug 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
9%7:14 AMNE12:57 PMNW-10:05 AMN240,456 mi
2
4%7:59 AMNE2:09 PMNW-11:04 AMN242,684 mi
3
1%8:28 AMNE3:30 PMNW-11:58 AMN244,840 mi
4
0%8:46 AMNE4:52 PMNW-12:49 PMN246,868 mi
5
1%8:58 AMENE6:12 PMWNW-1:34 PMN248,686 mi
6
5%9:07 AMENE7:28 PMWNW-2:17 PMN250,193 mi
7
10%9:15 AME8:42 PMW-2:56 PMN251,272 mi
8
16%9:21 AME9:55 PMW-3:35 PMN251,803 mi
9
24%9:27 AME11:08 PMWSW-4:13 PMN251,677 mi
10
33%9:34 AMESE--4:53 PMN250,810 mi
11
42%-12:23 AMWSW9:43 AMESE5:34 PMN249,162 mi
12
50%-1:41 AMSW9:54 AMSE6:19 PMN246,751 mi
13
62%-3:02 AMSW10:11 AMSE7:08 PMN243,661 mi
14
72%-4:23 AMSW10:38 AMSE8:02 PMN240,060 mi
15
82%-5:37 AMSW11:20 AMSE8:59 PMN236,190 mi
16
90%-6:36 AMSW12:25 PMSE9:58 PMN232,362 mi
17
96%-7:17 AMSW1:50 PMSE10:57 PMN228,923 mi
18
99%-7:43 AMSW3:26 PMSE11:53 PMN226,200 mi
19
100%-8:00 AMWSW5:05 PMESE--
20
100%-8:12 AMWSW6:42 PMESE12:47 AMN224,451 mi
21
97%-8:22 AMW8:18 PME1:38 AMN223,815 mi
22
92%-8:31 AMW9:51 PMENE2:28 AMN224,299 mi
23
84%-8:40 AMWNW11:26 PMENE3:18 AMN225,781 mi
24
73%-8:51 AMWNW-4:09 AMN228,048 mi
25
62%1:00 AMNE9:06 AMNW-5:03 AMN230,838 mi
26
50%2:34 AMNE9:27 AMNW-6:00 AMN233,892 mi
27
39%4:00 AMNE10:00 AMNW-7:00 AMN236,984 mi
28
29%5:11 AMNE10:49 AMNW-8:00 AMN239,945 mi
29
20%6:01 AMNE11:56 AMNW-8:59 AMN242,665 mi
30
12%6:33 AMNE1:15 PMNW-9:54 AMN245,088 mi
31
6%6:54 AMNE2:37 PMNW-10:45 AMN247,191 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 Grytviken is essentially constant during August, remaining around 0% throughout.

Humidity Comfort Levels in August in Grytviken

Humidity Comfort Levels in August in GrytvikenAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JulSepAug 160%Aug 160%Aug 10%Aug 10%Aug 310%Aug 310%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 Grytviken is essentially constant during August, remaining within 0.3 miles per hour of 20.0 miles per hour throughout.

For reference, on August 28, the windiest day of the year, the daily average wind speed is 20.3 miles per hour, while on December 21, the calmest day of the year, the daily average wind speed is 17.0 miles per hour.

The highest daily average wind speed during August is 20.3 miles per hour on August 28.

Average Wind Speed in August in Grytviken

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 Grytviken throughout August is predominantly from the west, with a peak proportion of 54% on August 7.

Wind Direction in August in Grytviken

Wind Direction in August in GrytvikenAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JulSepwestsouthnortheast
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).

Grytviken 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 Grytviken is essentially constant during August, remaining around 33°F throughout.

Average Water Temperature in August in Grytviken

Average Water Temperature in August in GrytvikenAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313131.0°F31.0°F31.5°F31.5°F32.0°F32.0°F32.5°F32.5°F33.0°F33.0°F33.5°F33.5°F34.0°F34.0°F34.5°F34.5°F35.0°F35.0°FJulSepAug 133°FAug 133°FAug 3132°FAug 3132°FAug 1133°FAug 1133°FAug 2132°FAug 2132°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 Grytviken typically lasts for 2.6 months (76 days), from around December 30 to around March 17, rarely starting before December 2, or ending after April 20.

The month of August in Grytviken is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in August in Grytviken

Time Spent in Various Temperature Bands and the Growing Season in August in GrytvikenAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSep-0%Aug 16-0%Aug 16freezingvery 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 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 Grytviken are essentially constant during August, remaining around 0°F throughout.

Growing Degree Days in August in Grytviken

Growing Degree Days in August in GrytvikenAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0°F0.0°F0.1°F0.1°F0.2°F0.2°F0.3°F0.3°F0.4°F0.4°F0.5°F0.5°F0.6°F0.6°F0.7°F0.7°F0.8°F0.8°F0.9°F0.9°F1.0°F1.0°FJulSepAug 10°FAug 10°FAug 310°FAug 310°FAug 110°FAug 110°FAug 210°FAug 210°F
The average growing degree days accumulated over the course of August, 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 Grytviken is gradually increasing during August, rising by 0.8 kWh, from 0.7 kWh to 1.5 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in August in Grytviken

Average Daily Incident Shortwave Solar Energy in August in GrytvikenAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 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 kWhJulSepAug 10.7 kWhAug 10.7 kWhAug 311.5 kWhAug 311.5 kWhAug 110.9 kWhAug 110.9 kWhAug 211.2 kWhAug 211.2 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 Grytviken are -54.281 deg latitude, -36.509 deg longitude, and 13 ft elevation.

The topography within 2 miles of Grytviken contains very significant variations in elevation, with a maximum elevation change of 1,926 feet and an average elevation above sea level of 570 feet. Within 10 miles contains very significant variations in elevation (7,513 feet). Within 50 miles also contains extreme variations in elevation (9,669 feet).

The area within 2 miles of Grytviken is covered by snow and glaciers (51%), water (24%), and shrubs (11%), within 10 miles by snow and glaciers (52%) and water (43%), and within 50 miles by water (83%) and snow and glaciers (16%).

This report illustrates the typical weather in Grytviken, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Grytviken is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.

The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Grytviken, according to the International Standard Atmosphere .

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.

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.

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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.

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