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Climate and Average Weather Year Round in Saint Lucia St. Lucia

The climate in Saint Lucia is hot, oppressive, extremely windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 76°F to 87°F and is rarely below 73°F or above 89°F.

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

Climate in Saint Lucia

warmhotwarmJanFebMarAprMayJunJulAugSepOctNovDecNowNow59%59%29%29%overcastclearprecipitation: 5.9 inprecipitation: 5.9 in1.2 in1.2 inmuggy: 100%muggy: 100%97%97%beach/pool score: 7.5beach/pool score: 7.54.34.3
Saint Lucia weather by month. Click on each chart for more information.

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

Average High and Low Temperature in Saint Lucia

Average High and Low Temperature in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2483°FJan 2483°FSep 387°FSep 387°F76°F76°F79°F79°FJul 2286°FJul 2286°FNov 386°FNov 386°FDec 2784°FDec 2784°FMar 1184°FMar 1184°F79°F79°F78°F78°F77°F77°F76°F76°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
High83°F83°F84°F85°F86°F86°F86°F87°F87°F87°F86°F84°F
Temp.79°F79°F80°F81°F82°F83°F83°F83°F83°F83°F82°F80°F
Low76°F76°F76°F78°F79°F80°F79°F79°F79°F79°F78°F77°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 Saint Lucia

Average Hourly Temperature in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec12 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.
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Marker
© Esri, et al.

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In Saint Lucia, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Saint Lucia begins around November 26 and lasts for 4.4 months, ending around April 6.

The clearest month of the year in Saint Lucia is January, during which on average the sky is clear, mostly clear, or partly cloudy 58% of the time.

The cloudier part of the year begins around April 6 and lasts for 7.6 months, ending around November 26.

The cloudiest month of the year in Saint Lucia is September, during which on average the sky is overcast or mostly cloudy 68% of the time.

Cloud Cover Categories in Saint Lucia

Cloud Cover Categories in Saint LuciaclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 1359%Jan 1359%Sep 2729%Sep 2729%Nov 2643%Nov 2643%Apr 644%Apr 644%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
Cloudier42%44%50%59%65%62%54%59%68%68%59%48%
Clearer58%56%50%41%35%38%46%41%32%32%41%52%

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

The wetter season lasts 6.3 months, from May 29 to December 7, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in Saint Lucia is October, with an average of 13.0 days with at least 0.04 inches of precipitation.

The drier season lasts 5.7 months, from December 7 to May 29. The month with the fewest wet days in Saint Lucia is March, with an average of 5.3 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 Saint Lucia is October, with an average of 13.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 44% on November 9.

Daily Chance of Precipitation in Saint Lucia

Daily Chance of Precipitation in Saint LuciawetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 944%Nov 944%Mar 1316%Mar 1316%Jan 124%Jan 124%May 2930%May 2930%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
Rain6.8d5.0d5.3d6.4d8.1d10.2d11.6d12.6d12.0d13.0d12.5d8.4d

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. Saint Lucia experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Saint Lucia. The month with the most rain in Saint Lucia is October, with an average rainfall of 5.7 inches.

The month with the least rain in Saint Lucia is February, with an average rainfall of 1.2 inches.

Average Monthly Rainfall in Saint Lucia

Average Monthly Rainfall in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inOct 15.9 inOct 15.9 inFeb 171.2 inFeb 171.2 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
Rainfall1.6″1.2″1.5″2.2″2.8″3.5″4.1″4.8″5.6″5.7″5.1″2.6″

The length of the day in Saint Lucia varies over the course of the year. In 2021, the shortest day is December 21, with 11 hours, 19 minutes of daylight; the longest day is June 20, with 12 hours, 57 minutes of daylight.

Hours of Daylight and Twilight in Saint Lucia

Hours of Daylight and Twilight in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2012 hr, 57 minJun 2012 hr, 57 minJun 2012 hr, 7 minSep 2212 hr, 7 minSep 2211 hr, 19 minDec 2111 hr, 19 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
Daylight11.4h11.7h12.1h12.5h12.8h12.9h12.8h12.6h12.2h11.8h11.5h11.3h

The earliest sunrise is at 5:34 AM on June 2, and the latest sunrise is 57 minutes later at 6:31 AM on January 22. The earliest sunset is at 5:32 PM on November 20, and the latest sunset is 1 hour, 3 minutes later at 6:36 PM on July 9.

Daylight saving time (DST) is not observed in Saint Lucia during 2021.

Sunrise & Sunset with Twilight in Saint Lucia

Sunrise & Sunset with Twilight in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 25:34 AMJun 25:34 AM6:36 PMJul 96:36 PMJul 9Nov 205:32 PMNov 205:32 PM6:31 AMJan 226:31 AMJan 22daynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 Saint Lucia

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 perceived humidity level in Saint Lucia, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 1% of 99% throughout.

Humidity Comfort Levels in Saint Lucia

Humidity Comfort Levels in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2897%Feb 2897%100%Aug 10100%Aug 10NowNowmiserablemiserableoppressiveoppressivemuggymuggy
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 days30.6d27.3d30.4d29.9d31.0d30.0d31.0d31.0d30.0d31.0d30.0d30.9d

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 Saint Lucia experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 8.5 months, from November 25 to August 8, with average wind speeds of more than 15.3 miles per hour. The windiest month of the year in Saint Lucia is January, with an average hourly wind speed of 17.5 miles per hour.

The calmer time of year lasts for 3.5 months, from August 8 to November 25. The calmest month of the year in Saint Lucia is September, with an average hourly wind speed of 13.1 miles per hour.

Average Wind Speed in Saint Lucia

Average Wind Speed in Saint LuciawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphJun 2117.7 mphJun 2117.7 mphSep 1512.9 mphSep 1512.9 mphNov 2515.3 mphNov 2515.3 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)17.517.316.315.716.117.416.714.613.113.314.816.5

The predominant average hourly wind direction in Saint Lucia is from the east throughout the year.

Wind Direction in Saint Lucia

Wind Direction in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNoweastsouth
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).

Saint Lucia 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 3.0 months, from August 12 to November 12, with an average temperature above 83°F. The month of the year in Saint Lucia with the warmest water is September, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.1 months, from January 10 to April 14, with an average temperature below 81°F. The month of the year in Saint Lucia with the coolest water is February, with an average temperature of 80°F.

Average Water Temperature in Saint Lucia

Average Water Temperature in Saint LuciawarmcoolJanFebMarAprMayJunJulAugSepOctNovDec78°F78°F79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°F85°F85°F86°F86°FSep 1484°FSep 1484°F80°FFeb 2280°FFeb 22Aug 1283°FAug 1283°FNov 1283°FNov 1283°FJan 1081°FJan 1081°FApr 1481°FApr 1481°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature80°F80°F80°F81°F82°F82°F82°F83°F84°F84°F83°F82°F

To characterize how pleasant the weather is in Saint Lucia 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 Saint Lucia for general outdoor tourist activities is from early January to mid March, with a peak score in the first week of February.

Tourism Score in Saint Lucia

Tourism Score in Saint Luciabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.75.72.52.52.72.7NowNowprecipitationprecipitationcloudsclouds 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 Saint Lucia for hot-weather activities is from mid December to early April, with a peak score in the first week of February.

Beach/Pool Score in Saint Lucia

Beach/Pool Score in Saint Luciabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.57.54.34.35.75.75.35.3NowNowprecipitationprecipitationcloudscloudstemperaturetemperature 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 Saint Lucia 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 Saint Lucia

Time Spent in Various Temperature Bands and the Growing Season in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec0%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 3NowNowwarmhotcomfortable
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 Saint Lucia

Growing Degree Days in Saint LuciaJanFebMarAprMayJunJulAugSepOctNovDec0°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°FJan 31900°FJan 31900°FDec 3111,448°FDec 3111,448°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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.5 months, from February 27 to May 11, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest month of the year in Saint Lucia is April, with an average of 7.0 kWh.

The darker period of the year lasts for 2.7 months, from September 14 to December 5, with an average daily incident shortwave energy per square meter below 5.2 kWh. The darkest month of the year in Saint Lucia is October, with an average of 4.7 kWh.

Average Daily Incident Shortwave Solar Energy in Saint Lucia

Average Daily Incident Shortwave Solar Energy in Saint LuciabrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhApr 27.1 kWhApr 27.1 kWhOct 124.7 kWhOct 124.7 kWhMay 116.6 kWhMay 116.6 kWhDec 55.2 kWhDec 55.2 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)5.76.46.97.06.46.06.05.85.14.74.95.3

For the purposes of this report, the geographical coordinates of Saint Lucia are 13.883 deg latitude, -60.967 deg longitude, and 0 ft elevation.

The topography within 2 miles of Saint Lucia 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 Saint Lucia is covered by trees (73%) and cropland (24%), within 10 miles by water (40%) and trees (39%), and within 50 miles by water (95%).

This report illustrates the typical weather in Saint Lucia, 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 Hewanorra 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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