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Climate and Average Weather Year Round in Dominica Dominica

The climate in Dominica is hot, oppressive, extremely windy, and partly cloudy. Over the course of the year, the temperature typically varies from 71°F to 88°F and is rarely below 68°F or above 90°F.

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

Climate in Dominica

warmhotwarmJanFebMarAprMayJunJulAugSepOctNovDecNowNow69%69%31%31%clearovercastprecipitation: 5.8 inprecipitation: 5.8 in1.2 in1.2 inmuggy: 100%muggy: 100%93%93%beach/pool score: 7.7beach/pool score: 7.74.64.6
Dominica weather by month. Click on each chart for more information.

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

Average High and Low Temperature in Dominica

Average High and Low Temperature in DominicaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2683°FJan 2683°FSep 288°FSep 288°F71°F71°F76°F76°FMay 2587°FMay 2587°FOct 2187°FOct 2187°FDec 1784°FDec 1784°FMar 1184°FMar 1184°F76°F76°F75°F75°F73°F73°F72°F72°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°F86°F87°F87°F87°F88°F88°F87°F86°F84°F
Temp.77°F77°F78°F79°F81°F82°F82°F82°F81°F80°F79°F78°F
Low72°F71°F72°F74°F76°F77°F77°F77°F76°F75°F74°F73°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 Dominica

Average Hourly Temperature in DominicaJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowcomfortablecomfortablecomfortablewarmhot
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 Dominica, 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 Dominica begins around November 26 and lasts for 4.7 months, ending around April 17.

The clearest month of the year in Dominica is January, during which on average the sky is clear, mostly clear, or partly cloudy 68% of the time.

The cloudier part of the year begins around April 17 and lasts for 7.3 months, ending around November 26.

The cloudiest month of the year in Dominica is September, during which on average the sky is overcast or mostly cloudy 67% of the time.

Cloud Cover Categories in Dominica

Cloud Cover Categories in DominicaclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 1369%Jan 1369%Sep 2831%Sep 2831%Nov 2650%Nov 2650%Apr 1750%Apr 1750%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
Cloudier32%34%41%50%62%61%51%56%67%66%55%39%
Clearer68%66%59%50%38%39%49%44%33%34%45%61%

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

The wetter season lasts 5.7 months, from June 15 to December 7, with a greater than 33% chance of a given day being a wet day. The month with the most wet days in Dominica is September, with an average of 14.5 days with at least 0.04 inches of precipitation.

The drier season lasts 6.3 months, from December 7 to June 15. The month with the fewest wet days in Dominica is March, with an average of 5.1 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 Dominica is September, with an average of 14.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on September 25.

Daily Chance of Precipitation in Dominica

Daily Chance of Precipitation in DominicawetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Sep 2550%Sep 2550%Mar 1316%Mar 1316%Jan 124%Jan 124%Jun 1533%Jun 1533%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
Rain6.6d4.7d5.1d6.7d8.6d10.3d13.4d14.6d14.5d14.0d12.2d8.9d

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. Dominica experiences extreme seasonal variation in monthly rainfall.

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

The month with the least rain in Dominica is March, with an average rainfall of 1.2 inches.

Average Monthly Rainfall in Dominica

Average Monthly Rainfall in DominicaJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inOct 45.8 inOct 45.8 inFeb 281.2 inFeb 281.2 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
Rainfall1.7″1.2″1.2″1.9″2.6″3.4″4.6″5.2″5.7″5.6″5.1″2.8″

The length of the day in Dominica varies over the course of the year. In 2021, the shortest day is December 21, with 11 hours, 13 minutes of daylight; the longest day is June 20, with 13 hours, 3 minutes of daylight.

Hours of Daylight and Twilight in Dominica

Hours of Daylight and Twilight in DominicaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2013 hr, 3 minJun 2013 hr, 3 minJun 2012 hr, 7 minSep 2212 hr, 7 minSep 2211 hr, 13 minDec 2111 hr, 13 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
Daylight11.3h11.7h12.1h12.5h12.9h13.0h12.9h12.6h12.2h11.8h11.4h11.2h

The earliest sunrise is at 5:33 AM on June 3, and the latest sunrise is 1 hour, 2 minutes later at 6:35 AM on January 21. The earliest sunset is at 5:31 PM on November 21, and the latest sunset is 1 hour, 9 minutes later at 6:40 PM on July 8.

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

Sunrise & Sunset with Twilight in Dominica

Sunrise & Sunset with Twilight in DominicaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 35:33 AMJun 35:33 AM6:40 PMJul 86:40 PMJul 8Nov 215:31 PMNov 215:31 PM6:35 AMJan 216:35 AMJan 21daynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 Dominica

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 Dominica, 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 4% of 96% throughout.

Humidity Comfort Levels in Dominica

Humidity Comfort Levels in DominicaJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 693%Mar 693%100%Aug 16100%Aug 16NowNowmiserablemiserableoppressiveoppressivemuggymuggy
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 days30.1d26.4d29.3d29.6d31.0d30.0d31.0d31.0d30.0d31.0d30.0d30.7d

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 Dominica experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 3.3 months, from May 7 to August 17, with average wind speeds of more than 15.3 miles per hour. The windiest month of the year in Dominica is June, with an average hourly wind speed of 17.2 miles per hour.

The calmer time of year lasts for 8.7 months, from August 17 to May 7. The calmest month of the year in Dominica is October, with an average hourly wind speed of 13.0 miles per hour.

Average Wind Speed in Dominica

Average Wind Speed in DominicawindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphJun 2817.8 mphJun 2817.8 mphOct 1012.8 mphOct 1012.8 mphMay 715.3 mphMay 715.3 mphAug 1715.3 mphAug 1715.3 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)17.016.815.715.215.617.217.215.213.313.014.416.1

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

Wind Direction in Dominica

Wind Direction in DominicaJanFebMarAprMayJunJulAugSepOctNovDec0%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).

Dominica 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 3.2 months, from August 10 to November 15, with an average temperature above 83°F. The month of the year in Dominica with the warmest water is September, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.0 months, from January 11 to April 10, with an average temperature below 80°F. The month of the year in Dominica with the coolest water is February, with an average temperature of 79°F.

Average Water Temperature in Dominica

Average Water Temperature in DominicawarmcoolJanFebMarAprMayJunJulAugSepOctNovDec78°F78°F79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°F85°F85°F86°F86°FSep 2984°FSep 2984°F79°FFeb 2479°FFeb 24Aug 1083°FAug 1083°FNov 1583°FNov 1583°FJan 1180°FJan 1180°FApr 1080°FApr 1080°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature80°F79°F80°F81°F82°F82°F82°F83°F84°F84°F83°F81°F

To characterize how pleasant the weather is in Dominica 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 Dominica for general outdoor tourist activities is from late December to mid March, with a peak score in the first week of February.

Tourism Score in Dominica

Tourism Score in Dominicabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.63.03.03.23.2NowNowprecipitationprecipitationcloudsclouds 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 Dominica for hot-weather activities is from mid December to mid April, with a peak score in the first week of February.

Beach/Pool Score in Dominica

Beach/Pool Score in Dominicabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.77.74.64.65.75.75.65.6NowNowprecipitationprecipitationtemperaturetemperature 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 Dominica 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 Dominica

Time Spent in Various Temperature Bands and the Growing Season in DominicaJanFebMarAprMayJunJulAugSepOctNovDec0%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 Dominica

Growing Degree Days in DominicaJanFebMarAprMayJunJulAugSepOctNovDec0°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°FMar 91,800°FMar 91,800°FDec 3110,721°FDec 3110,721°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 2.2 months, from March 3 to May 10, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest month of the year in Dominica is April, with an average of 7.1 kWh.

The darker period of the year lasts for 3.2 months, from September 15 to December 21, with an average daily incident shortwave energy per square meter below 5.2 kWh. The darkest month of the year in Dominica is October, with an average of 4.7 kWh.

Average Daily Incident Shortwave Solar Energy in Dominica

Average Daily Incident Shortwave Solar Energy in DominicabrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhApr 37.2 kWhApr 37.2 kWhOct 234.7 kWhOct 234.7 kWhMay 106.7 kWhMay 106.7 kWhSep 155.2 kWhSep 155.2 kWhDec 215.2 kWhDec 215.2 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)5.66.37.07.16.56.16.25.95.24.74.95.2

For the purposes of this report, the geographical coordinates of Dominica are 15.500 deg latitude, -61.333 deg longitude, and 0 ft elevation.

The topography within 2 miles of Dominica 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 Dominica is covered by shrubs (94%), within 10 miles by water (45%) and trees (29%), and within 50 miles by water (95%).

This report illustrates the typical weather in Dominica, 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 Roseau 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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