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Fall Weather in Cayman Islands Cayman Islands

Daily high temperatures decrease by 5°F, from 89°F to 84°F, rarely falling below 81°F or exceeding 90°F.

Daily low temperatures are around 78°F, rarely falling below 74°F or exceeding 82°F.

For reference, on August 5, the hottest day of the year, temperatures in Cayman Islands typically range from 81°F to 89°F, while on January 28, the coldest day of the year, they range from 74°F to 82°F.

Average High and Low Temperature in the Fall in Cayman Islands

Average High and Low Temperature in the Fall in Cayman IslandsSepOctNov70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°F105°F105°FSummerWinterSep 189°FSep 189°F80°F80°FNov 3084°FNov 3084°F77°F77°FOct 188°FOct 188°F79°F79°FNov 186°FNov 186°F78°F78°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 fall temperatures. 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 the Fall in Cayman Islands

Average Hourly Temperature in the Fall in Cayman IslandsSepOctNov12 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 AMSummerWinterwarmhot
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 fall in Cayman Islands experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 77% to 38%. The highest chance of overcast or mostly cloudy conditions is 79% on September 19.

The clearest day of the fall is November 30, with clear, mostly clear, or partly cloudy conditions 62% of the time.

For reference, on June 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 81%, while on February 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%.

Cloud Cover Categories in the Fall in Cayman Islands

Cloud Cover Categories in the Fall in Cayman IslandsSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterFeb 2582%Feb 2582%Sep 123%Sep 123%Nov 3062%Nov 3062%Oct 124%Oct 124%Nov 144%Nov 144%clearpartly cloudymostly cloudyovercastmostly clear
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 Cayman Islands, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 29% and ending it at 16%.

For reference, the year's highest daily chance of a wet day is 40% on September 27, and its lowest chance is 3% on April 11.

Probability of Precipitation in the Fall in Cayman Islands

Probability of Precipitation in the Fall in Cayman IslandsSepOctNov0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%SummerWinterSep 2740%Sep 2740%Sep 129%Sep 129%Nov 3016%Nov 3016%Nov 131%Nov 131%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 season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in Cayman Islands is gradually decreasing, starting the season at 2.0 inches, when it rarely exceeds 4.2 inches or falls below 0.3 inches, and ending the season at 1.7 inches, when it rarely exceeds 3.7 inches or falls below 0.2 inches.

The highest average 31-day accumulation is 4.2 inches on October 13.

Average Monthly Rainfall in the Fall in Cayman Islands

Average Monthly Rainfall in the Fall in Cayman IslandsSepOctNov0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inSummerWinterOct 124.2 inOct 124.2 inSep 12.0 inSep 12.0 inNov 301.7 inNov 301.7 inNov 13.8 inNov 13.8 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 the fall in Cayman Islands, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 27 minutes, implying an average daily decrease of 58 seconds, and weekly decrease of 6 minutes, 45 seconds.

The shortest day of the fall is November 30, with 11 hours, 3 minutes of daylight and the longest day is September 1, with 12 hours, 30 minutes of daylight.

Hours of Daylight and Twilight in the Fall in Cayman Islands

Hours of Daylight and Twilight in the Fall in Cayman IslandsSepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterSep 2212 hr, 8 minSep 2212 hr, 8 minnightnightdaydayNov 3011 hr, 3 minNov 3011 hr, 3 minNov 111 hr, 25 minNov 111 hr, 25 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 fall in Cayman Islands is 6:07 AM on September 1 and the latest sunrise is 33 minutes later at 6:40 AM on November 30.

The latest sunset is 6:37 PM on September 1 and the earliest sunset is 55 minutes earlier at 5:42 PM on November 24.

Daylight saving time is not observed in Cayman Islands during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:45 AM and sets 13 hours, 19 minutes later, at 7:03 PM, while on December 21, the shortest day of the year, it rises at 6:52 AM and sets 10 hours, 57 minutes later, at 5:49 PM.

Sunrise & Sunset with Twilight in the Fall in Cayman Islands

Sunrise & Sunset with Twilight in the Fall in Cayman IslandsSepOctNov2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter6:07 AM6:07 AMSep 16:37 PMSep 16:37 PM6:36 AM6:36 AMNov 245:42 PMNov 245:42 PM6:13 AM6:13 AMOct 16:10 PMOct 16:10 PM6:23 AM6:23 AMNov 15:48 PMNov 15:48 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the fall. 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 the Fall in Cayman Islands

Solar Elevation and Azimuth in the Fall in Cayman IslandsSepOctNov12 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 AMSummerWinter0010202030304050600010102030304040506070
northeastsouthwest
Solar elevation and azimuth in the the fall of 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 the fall of 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 the Fall in Cayman Islands

Moon Rise, Set & Phases in the Fall in Cayman IslandsSepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterAug 46:14 AMAug 46:14 AMAug 191:26 PMAug 191:26 PMSep 28:56 PMSep 28:56 PMSep 179:35 PMSep 179:35 PMOct 21:50 PMOct 21:50 PMOct 176:27 AMOct 176:27 AMNov 17:48 AMNov 17:48 AMNov 154:29 PMNov 154:29 PMDec 11:22 AMDec 11:22 AMDec 154:02 AMDec 154:02 AMDec 305:28 PMDec 305:28 PM7:26 PM7:26 PM7:03 PM7:03 PM6:52 AM6:52 AM6:36 PM6:36 PM6:16 PM6:16 PM6:37 AM6:37 AM6:02 AM6:02 AM6:10 PM6:10 PM5:27 PM5:27 PM6:21 AM6:21 AM6:25 AM6:25 AM5:51 PM5:51 PM5:31 PM5:31 PM7:17 AM7:17 AM6:01 PM6:01 PM5:06 PM5:06 PM7:08 AM7:08 AM5:44 PM5:44 PM
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.

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 Cayman Islands is gradually decreasing during the fall, falling from 100% to 97% over the course of the season.

For reference, on May 22, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 15, the least muggy day of the year, there are muggy conditions 90% of the time.

Humidity Comfort Levels in the Fall in Cayman Islands

Humidity Comfort Levels in the Fall in Cayman IslandsSepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterSep 1100%Sep 1100%Nov 3097%Nov 3097%Oct 1100%Oct 1100%Nov 199%Nov 199%miserablemiserableoppressiveoppressivemuggymuggyhumidhumid
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 Cayman Islands is very rapidly increasing during the fall, increasing from 10.8 miles per hour to 15.5 miles per hour over the course of the season.

For reference, on November 25, the windiest day of the year, the daily average wind speed is 15.7 miles per hour, while on September 10, the calmest day of the year, the daily average wind speed is 10.7 miles per hour.

The lowest daily average wind speed during the fall is 10.7 miles per hour on September 10.

Average Wind Speed in the Fall in Cayman Islands

Average Wind Speed in the Fall in Cayman IslandsSepOctNov0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphSummerWinterSep 1010.7 mphSep 1010.7 mphNov 3015.5 mphNov 3015.5 mphOct 111.2 mphOct 111.2 mphNov 114.4 mphNov 114.4 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 Cayman Islands throughout the fall is predominantly from the east, with a peak proportion of 85% on September 1.

Wind Direction in the Fall in Cayman Islands

Wind Direction in the Fall in Cayman IslandsSepOctNov0%100%20%80%40%60%60%40%80%20%100%0%SummerWintereastnorthsouth
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).

Cayman Islands 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 Cayman Islands is gradually decreasing during the fall, falling by 3°F, from 85°F to 82°F, over the course of the season.

The highest average surface water temperature during the fall is 85°F on September 9.

Average Water Temperature in the Fall in Cayman Islands

Average Water Temperature in the Fall in Cayman IslandsSepOctNov79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°F85°F85°F86°F86°F87°F87°FSummerWinterSep 985°FSep 985°FNov 3082°FNov 3082°FOct 185°FOct 185°FNov 184°FNov 184°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 Cayman Islands 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 the Fall in Cayman Islands

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Cayman IslandsSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinter100%Oct 16100%Oct 16warmhotcomfortable
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 Cayman Islands are very rapidly increasing during the fall, increasing by 2,902°F, from 7,582°F to 10,483°F, over the course of the season.

Growing Degree Days in the Fall in Cayman Islands

Growing Degree Days in the Fall in Cayman IslandsSepOctNov7,500°F7,500°F8,000°F8,000°F8,500°F8,500°F9,000°F9,000°F9,500°F9,500°F10,000°F10,000°F10,500°F10,500°FSummerWinterSep 17,582°FSep 17,582°FNov 3010,483°FNov 3010,483°FOct 18,582°FOct 18,582°FNov 19,590°FNov 19,590°F
The average growing degree days accumulated over the course of the fall, 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 Cayman Islands is essentially constant during the fall, remaining within 0.2 kWh of 4.3 kWh throughout.

The lowest average daily incident shortwave solar energy during the fall is 4.1 kWh on September 21.

Average Daily Incident Shortwave Solar Energy in the Fall in Cayman Islands

Average Daily Incident Shortwave Solar Energy in the Fall in Cayman IslandsSepOctNov0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWhSummerWinterSep 214.1 kWhSep 214.1 kWhSep 14.3 kWhSep 14.3 kWhNov 304.5 kWhNov 304.5 kWhNov 14.6 kWhNov 14.6 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 Cayman Islands are 19.500 deg latitude, -80.667 deg longitude, and 0 ft elevation.

The topography within 2 miles of Cayman Islands 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 Cayman Islands is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (99%).

This report illustrates the typical weather in Cayman Islands, 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 Owen Roberts International Airport page.

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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