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August Weather in British Indian Ocean Territory British Indian Ocean Territory

Daily high temperatures are around 84°F, rarely falling below 81°F or exceeding 87°F. The lowest daily average high temperature is 84°F on August 8.

Daily low temperatures are around 77°F, rarely falling below 74°F or exceeding 79°F. The lowest daily average low temperature is 76°F on August 10.

For reference, on March 24, the hottest day of the year, temperatures in British Indian Ocean Territory typically range from 79°F to 88°F, while on August 10, the coldest day of the year, they range from 76°F to 84°F.

Average High and Low Temperature in August in British Indian Ocean Territory

Average High and Low Temperature in August in British Indian Ocean TerritoryAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313174°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°F90°F90°F92°F92°F94°F94°FJulSepAug 684°FAug 684°F77°F77°FAug 3184°FAug 3184°F77°F77°FAug 2184°FAug 2184°F77°F77°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 British Indian Ocean Territory

Average Hourly Temperature in August in British Indian Ocean TerritoryAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSepwarm
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.
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The month of August in British Indian Ocean Territory 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 clearest day of the month is August 1, with clear, mostly clear, or partly cloudy conditions 38% of the time.

For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 38%.

Cloud Cover Categories in August in British Indian Ocean Territory

Cloud Cover Categories in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepAug 138%Aug 138%Aug 3134%Aug 3134%Aug 1136%Aug 1136%Aug 2136%Aug 2136%mostly clearpartly cloudymostly cloudyovercastclear
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 British Indian Ocean Territory, the chance of a wet day over the course of August is very rapidly increasing, starting the month at 29% and ending it at 40%.

For reference, the year's highest daily chance of a wet day is 70% on January 21, and its lowest chance is 28% on July 30.

Probability of Precipitation in August in British Indian Ocean Territory

Probability of Precipitation in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%JulSepAug 129%Aug 129%Aug 3140%Aug 3140%Aug 1132%Aug 1132%Aug 2135%Aug 2135%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 August in British Indian Ocean Territory is rapidly increasing, starting the month at 2.7 inches, when it rarely exceeds 5.6 inches or falls below 0.4 inches, and ending the month at 4.3 inches, when it rarely exceeds 7.9 inches or falls below 0.9 inches.

The lowest average 31-day accumulation is 2.7 inches on August 2.

Average Monthly Rainfall in August in British Indian Ocean Territory

Average Monthly Rainfall in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inJulSepAug 22.7 inAug 22.7 inAug 314.3 inAug 314.3 inAug 112.9 inAug 112.9 inAug 213.4 inAug 213.4 in
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 August in British Indian Ocean Territory, the length of the day is essentially constant. The shortest day of the month is August 1, with 11 hours, 51 minutes of daylight and the longest day is August 31, with 11 hours, 59 minutes of daylight.

Hours of Daylight and Twilight in August in British Indian Ocean Territory

Hours of Daylight and Twilight in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrJulSepdaydaydaydaynightAug 111 hr, 51 minAug 111 hr, 51 minAug 3111 hr, 59 minAug 3111 hr, 59 minAug 1611 hr, 55 minAug 1611 hr, 55 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 latest sunrise of the month in British Indian Ocean Territory is 7:22 AM on August 1 and the earliest sunrise is 10 minutes earlier at 7:12 AM on August 31.

The latest sunset is 7:14 PM on August 6 and the earliest sunset is 2 minutes, 13 seconds earlier at 7:12 PM on August 31.

Daylight saving time is not observed in British Indian Ocean Territory during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:55 AM and sets 12 hours, 28 minutes later, at 7:24 PM, while on June 20, the shortest day of the year, it rises at 7:20 AM and sets 11 hours, 47 minutes later, at 7:06 PM.

Sunrise & Sunset with Twilight in August in British Indian Ocean Territory

Sunrise & Sunset with Twilight in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJulSep7:12 AM7:12 AMAug 317:12 PMAug 317:12 PM7:21 AM7:21 AMAug 67:14 PMAug 67:14 PM7:16 AM7:16 AMAug 217:13 PMAug 217:13 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 British Indian Ocean Territory

Solar Elevation and Azimuth in August in British Indian Ocean TerritoryAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSep0010102020203030404050505060607080000101020203030304040505060606070
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 British Indian Ocean Territory

Moon Rise, Set & Phases in August in British Indian Ocean TerritoryAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJulSepJul 64:58 AMJul 64:58 AMJul 214:18 PMJul 214:18 PMAug 45:14 PMAug 45:14 PMAug 2012:26 AMAug 2012:26 AMSep 37:56 AMSep 37:56 AMSep 188:35 AMSep 188:35 AM7:37 AM7:37 AM7:40 PM7:40 PM7:18 PM7:18 PM8:09 AM8:09 AM7:13 AM7:13 AM7:17 PM7:17 PM7:00 PM7:00 PM7:41 AM7:41 AM7:17 AM7:17 AM7:30 PM7:30 PM6:35 PM6:35 PM7:05 AM7:05 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
11%4:33 AMENE4:34 PMWNW-10:33 AMN239,777 mi
2
5%5:30 AMENE5:31 PMWNW-11:31 AMN242,016 mi
3
2%6:24 AMENE6:26 PMWNW-12:26 PMN244,197 mi
4
0%7:13 AMENE7:17 PMWNW-1:16 PMN246,270 mi
5
1%7:58 AMENE8:05 PMWNW-2:03 PMN248,161 mi
6
3%8:40 AMENE8:50 PMW-2:45 PMN249,774 mi
7
8%9:18 AME9:33 PMW-3:26 PMN250,996 mi
8
14%9:55 AME10:14 PMW-4:04 PMN251,706 mi
9
21%10:31 AME10:55 PMW-4:43 PMN251,791 mi
10
30%11:08 AME11:38 PMWSW-5:22 PMS251,156 mi
11
39%11:47 AMESE--6:03 PMS249,747 mi
12
50%-12:22 AMWSW12:28 PMESE6:48 PMS247,560 mi
13
59%-1:10 AMWSW1:13 PMESE7:36 PMS244,662 mi
14
69%-2:02 AMWSW2:04 PMESE8:30 PMS241,190 mi
15
79%-2:57 AMWSW2:59 PMESE9:27 PMS237,367 mi
16
87%-3:56 AMWSW3:59 PMESE10:28 PMS233,487 mi
17
94%-4:55 AMWSW5:00 PMESE11:28 PMS229,891 mi
18
97%-5:54 AMWSW6:01 PMESE--
19
99%-6:49 AMWSW7:00 PMESE12:27 AMS226,921 mi
20
100%-7:41 AMWSW7:57 PME1:22 AMS224,859 mi
21
98%-8:30 AMW8:52 PME2:15 AMS223,885 mi
22
94%-9:18 AMW9:45 PME3:05 AMN224,043 mi
23
86%-10:05 AMW10:39 PMENE3:55 AMN225,248 mi
24
77%-10:53 AMWNW11:34 PMENE4:45 AMN227,306 mi
25
66%-11:43 AMWNW-5:37 AMN229,967 mi
26
50%12:30 AMENE12:36 PMWNW-6:32 AMN232,965 mi
27
43%1:29 AMENE1:32 PMWNW-7:30 AMN236,064 mi
28
32%2:28 AMENE2:29 PMWNW-8:28 AMN239,075 mi
29
22%3:25 AMENE3:26 PMWNW-9:26 AMN241,873 mi
30
14%4:20 AMENE4:21 PMWNW-10:21 AMN244,388 mi
31
8%5:10 AMENE5:13 PMWNW-11:13 AMN246,587 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 British Indian Ocean Territory is essentially constant during August, remaining around 97% throughout.

For reference, on January 11, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 25, the least muggy day of the year, there are muggy conditions 97% of the time.

Humidity Comfort Levels in August in British Indian Ocean Territory

Humidity Comfort Levels in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JulSepAug 197%Aug 197%Aug 3197%Aug 3197%Aug 1197%Aug 1197%Aug 2197%Aug 2197%miserablemiserableoppressiveoppressivemuggymuggy
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 British Indian Ocean Territory is essentially constant during August, remaining within 0.3 miles per hour of 17.4 miles per hour throughout.

For reference, on August 8, the windiest day of the year, the daily average wind speed is 17.7 miles per hour, while on April 4, the calmest day of the year, the daily average wind speed is 8.5 miles per hour.

The highest daily average wind speed during August is 17.7 miles per hour on August 8.

Average Wind Speed in August in British Indian Ocean Territory

Average Wind Speed in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphJulSepAug 817.7 mphAug 817.7 mphAug 3117.1 mphAug 3117.1 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 in British Indian Ocean Territory throughout August is predominantly from the east, with a peak proportion of 70% on August 1.

Wind Direction in August in British Indian Ocean Territory

Wind Direction in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JulSepeastsouth
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).

British Indian Ocean Territory 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 British Indian Ocean Territory is essentially constant during August, remaining around 80°F throughout.

The lowest average surface water temperature during August is 80°F on August 13.

Average Water Temperature in August in British Indian Ocean Territory

Average Water Temperature in August in British Indian Ocean TerritoryAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313178°F78°F79°F79°F80°F80°F81°F81°F82°F82°F83°F83°FJulSepAug 1380°FAug 1380°FAug 180°FAug 180°FAug 3180°FAug 3180°FAug 2180°FAug 2180°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).

Temperatures in British Indian Ocean Territory are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in August in British Indian Ocean Territory

Time Spent in Various Temperature Bands and the Growing Season in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSep100%Aug 16100%Aug 16100%Jul 2100%Jul 2warmhot
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 British Indian Ocean Territory are rapidly increasing during August, increasing by 891°F, from 925°F to 1,816°F, over the course of the month.

Growing Degree Days in August in British Indian Ocean Territory

Growing Degree Days in August in British Indian Ocean TerritoryAug1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131900°F900°F1,000°F1,000°F1,100°F1,100°F1,200°F1,200°F1,300°F1,300°F1,400°F1,400°F1,500°F1,500°F1,600°F1,600°F1,700°F1,700°F1,800°F1,800°FJulSepAug 1925°FAug 1925°FAug 311,816°FAug 311,816°FAug 111,221°FAug 111,221°FAug 211,518°FAug 211,518°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 British Indian Ocean Territory is essentially constant during August, remaining within 0.2 kWh of 5.2 kWh throughout.

Average Daily Incident Shortwave Solar Energy in August in British Indian Ocean Territory

Average Daily Incident Shortwave Solar Energy in August in British Indian Ocean TerritoryAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhJulSepAug 15.1 kWhAug 15.1 kWhAug 315.4 kWhAug 315.4 kWhAug 115.2 kWhAug 115.2 kWhAug 215.3 kWhAug 215.3 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 British Indian Ocean Territory are -6.000 deg latitude, 72.000 deg longitude, and 0 ft elevation.

The topography within 2 miles of British Indian Ocean Territory is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of British Indian Ocean Territory is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%).

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

The details of the data sources used for this report can be found on the Diego Garcia page.

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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.

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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