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Contents
- The climate of Roseau
- The Best Time to Visit Roseau
- The Worst Time to Visit Roseau
- Spring Weather in Roseau
- Summer Weather in Roseau
- Autumn Weather in Roseau
- Winter Weather in Roseau
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average UV index
A calm, clear waterfront in the valley city of Roseau, Dominica
The climate of Roseau
Roseau, the capital city of Dominica, is located in an area characterized by a tropical rainforest climate, as per the Köppen climate classification. The geographical location of Roseau on the Western coast of the island of Dominica translates to unique weather patterns, characterized by high humidity, frequent rainfall, and relatively constant temperatures throughout the year.
Temperatures in Roseau vary surprisingly little, with monthly average high temperatures fluctuating only between 29°C (84.2°F) and 31°C (87.8°F), and monthly average low temperatures ranging from 21°C (69.8°F) to 24°C (75.2°F). This minimal fluctuation makes the city's weather rather predictable, with no distinct hot or cold season. On the other hand, the rainfall pattern is more varied. The city receives significant rainfall throughout the year, with monthly averages ranging from 87mm (3.43") to 252mm (9.92"). The number of rainfall days tends to increase towards the end of the year, with up to 23 days of rain in September.
Unique to the coastal city is the relatively consistent sea temperature, wavering from 26°C (78.8°F) to 29°C (84.2°F). Roseau also maintains a fairly high amount of daylight hours all year round, with a peak of 13 hours in June and a low of 11.2 hours in December. Sunshine hours mirror this pattern, remaining steady at approximately seven to eight hours daily. It's also worth noting that the UV index is typically very high throughout the year, peaking at 12 from March to September.
Temperatures in Roseau vary surprisingly little, with monthly average high temperatures fluctuating only between 29°C (84.2°F) and 31°C (87.8°F), and monthly average low temperatures ranging from 21°C (69.8°F) to 24°C (75.2°F). This minimal fluctuation makes the city's weather rather predictable, with no distinct hot or cold season. On the other hand, the rainfall pattern is more varied. The city receives significant rainfall throughout the year, with monthly averages ranging from 87mm (3.43") to 252mm (9.92"). The number of rainfall days tends to increase towards the end of the year, with up to 23 days of rain in September.
Unique to the coastal city is the relatively consistent sea temperature, wavering from 26°C (78.8°F) to 29°C (84.2°F). Roseau also maintains a fairly high amount of daylight hours all year round, with a peak of 13 hours in June and a low of 11.2 hours in December. Sunshine hours mirror this pattern, remaining steady at approximately seven to eight hours daily. It's also worth noting that the UV index is typically very high throughout the year, peaking at 12 from March to September.
The Best Time to Visit Roseau
Given the city's constant tropical temperatures, the best time to visit Roseau would arguably be during the months with less rainfall. These would be from February to April, when average precipitation hovers around 87mm (3.43") to 93mm (3.66") and the number of rainy days is less compared to other months. During these months the sea temperature is pleasant too, between 26°C (78.8°F) and 27°C (80.6°F), making it ideal for water-based activities.
The Worst Time to Visit Roseau
Considering the extensive rainfall and high number of rainy days, September to November might be less ideal for travelers to visit Roseau. These months experience the highest rainfall levels, with averages from 239mm (9.41") to 252mm (9.92"), and up to 23 rainy days in a month. Despite the warm tropical temperatures, such frequent rainfall could hamper outdoor activities such as hiking, sightseeing, and exploring the island's biodiversity.
Spring Weather in Roseau
Spring in Roseau spans from March to May, bringing slight differences in weather conditions. While the temperatures remain consistent from 29°C (84.2°F) to 31°C (87.8°F) for highs and 21°C (69.8°F) to 23°C (73.4°F) for lows, March sees slightly less rainfall at 93mm (3.66") compared to 137mm (5.39") in May. The number of rainy days also increases from 15 in March to 17 in May.
Summer Weather in Roseau
From June to August, Roseau experiences 'summer', although the tropical rainforest climate means temperatures are consistently warm year-round. Throughout these months, both the high temperatures and low temperatures remain at 31°C (87.8°F) and 23°C (73.4°F) to 24°C (75.2°F) respectively. Rainfall is heavier during these months, with August receiving the highest rainfall at 246mm (9.69").
Autumn Weather in Roseau
Autumn extends from September through November, a period characterized by the highest levels of rainfall. September and November average the most rainy days, with 19 each month and 23 in October. Despite the increased rainfall, temperatures remain stable; 31°C (87.8°F) for high and 23°C (73.4°F) for low, dropping slightly to 30°C (86°F) and 22°C (71.6°F) in November.
Winter Weather in Roseau
From December to February, Roseau experiences its 'winter' months. The term 'winter' is used loosely due to the consistently warm tropical temperatures that persist throughout these months, coupled with significant rain. December registers the highest rainfall during this period at 176mm (6.93"), while January and February are slightly 'drier' with 136mm (5.35") and 87mm (3.43") respectively. The temperatures throughout the winter months remain fairly stable, only varying from 29°C (84.2°F) to 30°C (86°F) for highs and from 21°C (69.8°F) to 22°C (71.6°F) for lows.
Weather in January
The start of the year in Roseau, Dominica, presents a balanced mix of rain and sun. Rainfall during this period reaches 136mm (5.35") across 18 days, making the city lush and enhancing the vivid hues of its natural beauty. Sunlight is often a generous companion throughout the day, granting ample opportunities for outdoor activities. Weather in January »
Weather in February
February in Roseau, Dominica, ushers in a slight decrease in rainfall from January, creating a calmer backdrop against the city's vibrant culture. Thanks to the tropical climate, cooling breezes help balance out the gradually warming temperatures. Weather in February »
Weather in March
March’s weather in Roseau, Dominica, begins to reflect the heart of the tropical climate, paving the way for longer days ahead. Transitioning from February, the upward temperature trend introduces a warmth that’s a hallmark of the region. Weather in March »
Weather in April
April in Roseau, Dominica, presents weather conditions similar to March, ensuring continuity in the tropical experience. A noticeable increase in temperature further warms the city, offering sun-filled days and star-lit nights. The rain begins to make a more frequent appearance, nourishing the lush flora, even as daylight shines for approximately 12.5 hours. Weather in April »
Weather in May
May invites residents and tourists in Roseau, Dominica, to a distinct tropical weather experience. A significant increase in rainfall, reaching 137mm (5.39"), is easily noticeable and can be attributed to the advancing wet season. However, longer daylight hours and a consistent sea temperature ensure that the city’s vibrant life continues unabated. Weather in May »
Weather in June
June brings a mix of heat, rain, and sun to Roseau, Dominica, heralding the onset of summer. Weather conditions remain relatively constant compared to May, offering a degree of predictability. A notable rise in rainfall makes the city's natural beauty even more lush and vibrant. Weather in June »
Weather in July
July is a month of heavy rainfall in Roseau, Dominica, marking an annual high of 246mm (9.69"). Despite this, the city’s tropical beauty shines through particularly when the sun breaks through the clouds. The temperature remains comfortably warm, ensuring that outdoor activities continue with minimal disruption. Weather in July »
Weather in August
In Roseau, Dominica, August weather is highly characteristic of the wet season. Even amongst the emphasis on showers during this time, the days continue to be warm, maintaining a tropical atmosphere. Sunlight remains a consistent partner to the rain, with both elements working in harmony to ensure the city's vibrancy. Weather in August »
Weather in September
Weather conditions in September in Roseau, Dominica, resemble those in August, with rain and sunshine co-existing harmoniously. The month sees a slight decline in sea temperature, but the change is barely perceptible. Higher rainfall intensifies the greenery, lending a unique charm to the cityscape. Weather in September »
Weather in October
In Roseau, Dominica, October weather brings about a slight decrease in rainfall, marking the slow retreat of the wet season. The city stays bathed in sunlight for a substantial period of the day, ensuring leisure activities can go on largely uninterrupted. Weather in October »
Weather in November
November in Roseau, Dominica, offers a further slight reduction in rainfall, making way for the approaching dry season. Whilst co-existing with sun-drenched days, rainfall drops to 252mm (9.92"), a significant contrast with previous months. Weather in November »
Weather in December
Come December, weather in Roseau, Dominica, transitions further towards the dry season, making it an attractive month for tourism. The decline in rainfall from November is noticeable as the city gears up for festivities. Daylight hours decrease; however, sunlight faithfully brightens most of the day. Weather in December »
Frequently asked questions
What is the coldest time of year in Roseau?
Roseau's coldest months, January, February and December, record an average high-temperature of 29°C (84.2°F).
How much does it rain in Roseau?
In Roseau, during the entire year, the rain falls for 218 days and collects up to 1996mm (78.58") of precipitation.
What are the months with the least sunshine in Roseau?
January, February, September through December, with an average of 7h of sunshine, are months with the least sunshine.
What is the driest month in Roseau?
February and April are months with the least rain in Roseau when the rain falls for 14 days and typically aggregates up to 87mm (3.43") of rain.
What months are the sea coldest in Roseau?
February and March, with an average sea temperature of 26°C (78.8°F), are months with the coldest seawater.
What are the months with the most sunshine in Roseau?
March through August, with an average of 8h of sunshine, are months with the most sunshine.
What is the month with the highest UV index in Roseau?
The months with the highest UV index in Roseau, Dominica, are March through September, with an average maximum UV index of 12.
What is the warmest month in Roseau?
Temperatures in Roseau, Dominica, reach their maximum during May through October, recording an average high-temperature of 31°C (87.8°F).
When are the longest days in Roseau?
June has the longest days of the year in Roseau, Dominica, with an average of 13h and 0min of daylight.
When is the sea warmest in Roseau?
The months with the warmest seawater are September and October, with an average sea temperature of 29°C (84.2°F).
What is the rainiest month in Roseau?
November is the month with the most rainfall in Roseau, Dominica. Rain falls for 19 days and accumulates 252mm (9.92") of precipitation.
What is the month with the shortest days in Roseau?
With an average of 11h and 12min of daylight, December has the shortest days of the year.
Is there Daylight Saving Time (DST) in Roseau?
Roseau, Dominica, does not utilize Daylight Saving Time (DST). AST timezone is used over the entire year.
What is the month with the lowest UV index in Roseau?
December is the month with the lowest UV index in Roseau, with an average maximum UV index of 8.
Average temperature
Roseau, Dominica
The warmest months (with the highest average high temperature) are May, June, July, August, September and October (31°C).
The months with the lowest average high temperature are January, February and December (29°C).
The month with the highest average low temperature is August (24°C).
The coldest months (with the lowest average low temperature) are January, February, March and December (21°C).
Average rainfall
Roseau, Dominica
- Average rainfall in January:
136mm - Average rainfall in February:
87mm - Average rainfall in March:
93mm - Average rainfall in April:
87mm - Average rainfall in May:
137mm - Average rainfall in June:
185mm
- Average rainfall in July:
108mm - Average rainfall in August:
246mm - Average rainfall in September:
250mm - Average rainfall in October:
239mm - Average rainfall in November:
252mm - Average rainfall in December:
176mm
The wettest month (with the highest rainfall) is November (252mm).
The driest months (with the least rainfall) are February and April (87mm).
Average rainfall days
Roseau, Dominica
- Average rainfall days in January:
18 days - Average rainfall days in February:
14 days - Average rainfall days in March:
15 days - Average rainfall days in April:
14 days - Average rainfall days in May:
17 days - Average rainfall days in June:
19 days
- Average rainfall days in July:
21 days - Average rainfall days in August:
20 days - Average rainfall days in September:
23 days - Average rainfall days in October:
19 days - Average rainfall days in November:
19 days - Average rainfall days in December:
19 days
The month with the highest number of rainy days is September (23 days).
The months with the least rainy days are February and April (14 days).
Average sea temperature
Roseau, Dominica
The best months for swimming (with the highest average sea temperature) are September and October (29°C).
The coldest months (with the lowest average sea temperature) are February and March (26°C).
Average daylight / Average sunshine
Roseau, Dominica
- Average daylight in January:
11h and 2min - Average daylight in February:
11h and 4min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 3min - Average daylight in May:
12h and 5min - Average daylight in June:
13h and 0min
- Average daylight in July:
12h and 5min - Average daylight in August:
12h and 4min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 5min - Average daylight in November:
11h and 2min - Average daylight in December:
11h and 1min
The month with the longest days is June (Average daylight: 13h and 0min).
The month with the shortest days is December (Average daylight: 11h and 12min).
The months with the most sunshine are March, April, May, June, July and August (Average sunshine: 8h).
The months with the least sunshine are January, February, September, October, November and December (Average sunshine: 7h).
Average UV index
Roseau, Dominica
The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 8).
Roseau, Dominica
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