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Climate and Average Weather Year Round in Cayman Islands Cayman Islands

In Cayman Islands, the wet season is hot and mostly cloudy, the dry season is warm and mostly clear, and it is oppressive and windy year round. Over the course of the year, the temperature typically varies from 74°F to 89°F and is rarely below 70°F or above 91°F.

Based on the beach/pool score, the best time of year to visit Cayman Islands for hot-weather activities is from mid December to mid April.

Climate in Cayman Islands

warmhotwarmJanFebMarAprMayJunJulAugSepOctNovDecNowNow82%82%19%19%clearovercastprecipitation: 4.2 inprecipitation: 4.2 in0.2 in0.2 inmuggy: 100%muggy: 100%90%90%beach/pool score: 8.6beach/pool score: 8.63.83.8
Cayman Islands weather by month. Click on each chart for more information.

The temperature in Cayman Islands varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

Average High and Low Temperature in Cayman Islands

Average High and Low Temperature in Cayman IslandsJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°F110°F110°FJan 2882°FJan 2882°FAug 689°FAug 689°F74°F74°F81°F81°FJun 1288°FJun 1288°FOct 588°FOct 588°FDec 1183°FDec 1183°FMar 1783°FMar 1783°F80°F80°F79°F79°F76°F76°F75°F75°FNowNow
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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High82°F82°F83°F85°F86°F88°F89°F89°F88°F87°F85°F83°F
Temp.78°F78°F79°F81°F82°F84°F85°F84°F84°F83°F81°F79°F
Low74°F74°F75°F77°F79°F80°F81°F80°F80°F79°F78°F76°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Cayman Islands

Average Hourly Temperature in Cayman IslandsJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowwarmhot
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.
Map
Marker
© Esri, et al.

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In Cayman Islands, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Cayman Islands begins around November 13 and lasts for 6.0 months, ending around May 15.

The clearest month of the year in Cayman Islands is February, during which on average the sky is clear, mostly clear, or partly cloudy 81% of the time.

The cloudier part of the year begins around May 15 and lasts for 6.0 months, ending around November 13.

The cloudiest month of the year in Cayman Islands is June, during which on average the sky is overcast or mostly cloudy 79% of the time.

Cloud Cover Categories in Cayman Islands

Cloud Cover Categories in Cayman IslandsclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Feb 2582%Feb 2582%Jun 1519%Jun 1519%Nov 1350%Nov 1350%May 1551%May 1551%NowNowclearmostly 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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier21%19%20%31%54%79%75%75%78%67%47%30%
Clearer79%81%80%69%46%21%25%25%22%33%53%70%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Cayman Islands varies significantly throughout the year.

The wetter season lasts 6.1 months, from May 19 to November 21, with a greater than 21% chance of a given day being a wet day. The month with the most wet days in Cayman Islands is October, with an average of 11.2 days with at least 0.04 inches of precipitation.

The drier season lasts 5.9 months, from November 21 to May 19. The month with the fewest wet days in Cayman Islands is April, with an average of 1.2 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Cayman Islands is October, with an average of 11.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 40% on September 28.

Daily Chance of Precipitation in Cayman Islands

Daily Chance of Precipitation in Cayman IslandswetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Sep 2840%Sep 2840%Apr 123%Apr 123%Jan 110%Jan 110%May 1921%May 1921%NowNowrain
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain2.5d1.8d1.5d1.2d6.0d8.6d5.5d6.8d10.3d11.2d7.2d3.8d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Cayman Islands experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.7 months, from April 28 to February 18, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Cayman Islands is October, with an average rainfall of 4.2 inches.

The rainless period of the year lasts for 2.3 months, from February 18 to April 28. The month with the least rain in Cayman Islands is April, with an average rainfall of 0.2 inches.

Average Monthly Rainfall in Cayman Islands

Average Monthly Rainfall in Cayman IslandsrainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inOct 144.2 inOct 144.2 inApr 80.2 inApr 80.2 inJun 42.9 inJun 42.9 inJul 261.0 inJul 261.0 inFeb 180.5 inFeb 180.5 inNowNow
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall0.6″0.5″0.4″0.2″1.8″2.6″1.1″1.4″2.9″4.2″2.9″0.9″

The length of the day in Cayman Islands varies over the course of the year. In 2021, the shortest day is December 21, with 10 hours, 57 minutes of daylight; the longest day is June 20, with 13 hours, 19 minutes of daylight.

Hours of Daylight and Twilight in Cayman Islands

Hours of Daylight and Twilight in Cayman IslandsJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2013 hr, 19 minJun 2013 hr, 19 minJun 2012 hr, 7 minSep 2212 hr, 7 minSep 2210 hr, 57 minDec 2110 hr, 57 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight11.1h11.5h12.1h12.6h13.1h13.3h13.2h12.7h12.2h11.7h11.2h11.0h

The earliest sunrise is at 5:43 AM on June 5, and the latest sunrise is 1 hour, 16 minutes later at 6:59 AM on January 17. The earliest sunset is at 5:42 PM on November 24, and the latest sunset is 1 hour, 23 minutes later at 7:05 PM on July 5.

Daylight saving time (DST) is not observed in Cayman Islands during 2021.

Sunrise & Sunset with Twilight in Cayman Islands

Sunrise & Sunset with Twilight in Cayman IslandsJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 55:43 AMJun 55:43 AM7:05 PMJul 57:05 PMJul 5Nov 245:42 PMNov 245:42 PM6:59 AMJan 176:59 AMJan 17daynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2021. 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 key lunar data for 2021. 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.

Moon Rise, Set & Phases in Cayman Islands

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.

Cayman Islands experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 9.5 months, from March 14 to December 31, during which time the comfort level is muggy, oppressive, or miserable at least 92% of the time.

The month with the fewest muggy days in Cayman Islands is February, with 25.4 days that are muggy or worse.

Humidity Comfort Levels in Cayman Islands

Humidity Comfort Levels in Cayman IslandsmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 3090%Jan 3090%100%Aug 1100%Aug 1Mar 1492%Mar 1492%Dec 3192%Dec 3192%NowNowmiserablemiserableoppressiveoppressivehumidhumidmuggymuggy
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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days28.0d25.4d29.0d29.4d30.9d30.0d31.0d31.0d30.0d30.9d29.6d29.3d

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 experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.0 months, from October 23 to March 25, with average wind speeds of more than 13.2 miles per hour. The windiest month of the year in Cayman Islands is December, with an average hourly wind speed of 15.6 miles per hour.

The calmer time of year lasts for 7.0 months, from March 25 to October 23. The calmest month of the year in Cayman Islands is September, with an average hourly wind speed of 10.9 miles per hour.

Average Wind Speed in Cayman Islands

Average Wind Speed in Cayman IslandswindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphNov 2615.7 mphNov 2615.7 mphSep 1110.7 mphSep 1110.7 mphMar 2513.2 mphMar 2513.2 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph)15.014.313.512.312.212.812.211.210.912.615.215.6

The predominant average hourly wind direction in Cayman Islands is from the east throughout the year.

Wind Direction in Cayman Islands

Wind Direction in Cayman IslandsJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNoweastnorthsouth
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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from July 15 to October 24, with an average temperature above 84°F. The month of the year in Cayman Islands with the warmest water is September, with an average temperature of 85°F.

The time of year with cooler water lasts for 3.4 months, from January 1 to April 13, with an average temperature below 81°F. The month of the year in Cayman Islands with the coolest water is February, with an average temperature of 80°F.

Average Water Temperature in Cayman Islands

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature80°F80°F80°F81°F82°F83°F84°F85°F85°F84°F83°F82°F

To characterize how pleasant the weather is in Cayman Islands throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Cayman Islands for general outdoor tourist activities is from late December to late March, with a peak score in the last week of January.

Tourism Score in Cayman Islands

Tourism Score in Cayman Islandsbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.17.12.22.22.32.3NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Cayman Islands for hot-weather activities is from mid December to mid April, with a peak score in the second week of February.

Beach/Pool Score in Cayman Islands

Beach/Pool Score in Cayman Islandsbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.68.63.83.83.93.9NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 Cayman Islands

Time Spent in Various Temperature Bands and the Growing Season in Cayman IslandsJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 3100%Jul 3NowNowcomfortablewarmhot
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.

Growing Degree Days in Cayman Islands

Growing Degree Days in Cayman IslandsJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F2,000°F2,000°F4,000°F4,000°F6,000°F6,000°F8,000°F8,000°F10,000°F10,000°FJan 390°FJan 390°FDec 3111,383°FDec 3111,383°FNowNow
The average growing degree days accumulated over the course of the year, 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 experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 2.1 months, from March 9 to May 13, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest month of the year in Cayman Islands is April, with an average of 7.1 kWh.

The darker period of the year lasts for 6.8 months, from June 12 to January 5, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest month of the year in Cayman Islands is September, with an average of 4.2 kWh.

Average Daily Incident Shortwave Solar Energy in Cayman Islands

Average Daily Incident Shortwave Solar Energy in Cayman IslandsbrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhApr 157.1 kWhApr 157.1 kWhSep 214.1 kWhSep 214.1 kWhMar 96.5 kWhMar 96.5 kWhJun 124.7 kWhJun 124.7 kWhJan 54.7 kWhJan 54.7 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh)5.05.86.77.16.24.74.54.44.24.44.64.5

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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