Roseau, Dominica Climate & Monthly Averages
The climate of Roseau
Roseau has a tropical wet-and-dry climate, marked by year-round warmth split between a rainy season and a pronounced dry season. Average daytime highs range from about 80°F (26°C) in February to around 85°F (29°C) in September, and the city records roughly 222 days of measurable precipitation a year.
Climate quick facts
- Hottest month: September - highs near 85°F (29°C)
- Coldest month: February - highs near 80°F (26°C)
- Record high: 90°F (32°C) · Record low: 69°F (20°C) (2015–2024)
- Wettest month: September (19 rainy days) · Sunniest: April (11.8 h sun/day)
- Climate type: tropical wet-and-dry - year-round warmth split between a rainy season and a pronounced dry season
Temperatures through the year
The warmest stretch of the year centers on September. Highs average 85°F (29°C) and overnight lows stay near 78°F (26°C). The coolest month is February, with typical highs of 80°F (26°C) and lows around 74°F (23°C). Based on 2015–2024 weather data, temperatures have reached as high as 90°F (32°C) and dropped as low as 69°F (20°C).
Rain, sun and snow
September is usually the wettest month. It brings about 5.5 inches (139 mm) of rain over 19 days, while April is the driest. April brings the most sunshine, averaging 11.8 hours of sun a day.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 80° | 74° | 15 | 2.5 in | 10.8 h/day | 78% |
| February | 80° | 74° | 15 | 2.5 in | 11.0 h/day | 78% |
| March | 80° | 74° | 16 | 2.7 in | 11.5 h/day | 78% |
| April | 82° | 75° | 18 | 2.2 in | 11.8 h/day | 79% |
| May | 83° | 77° | 16 | 2.3 in | 11.5 h/day | 79% |
| June | 83° | 78° | 19 | 3.3 in | 11.3 h/day | 81% |
| July | 83° | 78° | 23 | 5.0 in | 11.3 h/day | 83% |
| August | 84° | 78° | 22 | 4.8 in | 11.2 h/day | 83% |
| September | 85° | 78° | 19 | 5.5 in | 11.0 h/day | 82% |
| October | 84° | 78° | 20 | 4.5 in | 10.6 h/day | 82% |
| November | 83° | 77° | 21 | 5.0 in | 10.3 h/day | 82% |
| December | 81° | 75° | 18 | 3.2 in | 10.5 h/day | 80% |
Roseau month by month
Roseau weather in January
January brings highs around 80°F (26°C), lows near 74°F (24°C), about 15 wet days.
Roseau weather in February
February brings highs around 80°F (26°C), lows near 74°F (23°C), about 15 wet days - typically the coldest month of the year in Roseau.
Roseau weather in March
March brings highs around 80°F (27°C), lows near 74°F (23°C), about 16 wet days.
Roseau weather in April
April brings highs around 82°F (28°C), lows near 75°F (24°C), about 18 wet days - typically the driest month and the sunniest month of the year in Roseau.
Roseau weather in May
May brings highs around 83°F (28°C), lows near 77°F (25°C), about 16 wet days.
Roseau weather in June
June brings highs around 83°F (29°C), lows near 78°F (25°C), about 19 wet days.
Roseau weather in July
July brings highs around 83°F (28°C), lows near 78°F (25°C), about 23 wet days.
Roseau weather in August
August brings highs around 84°F (29°C), lows near 78°F (26°C), about 22 wet days.
Roseau weather in September
September brings highs around 85°F (29°C), lows near 78°F (26°C), about 19 wet days - typically the hottest month and the wettest month of the year in Roseau.
Roseau weather in October
October brings highs around 84°F (29°C), lows near 78°F (26°C), about 20 wet days.
Roseau weather in November
November brings highs around 83°F (28°C), lows near 77°F (25°C), about 21 wet days.
Roseau weather in December
December brings highs around 81°F (27°C), lows near 75°F (24°C), about 18 wet days.
Seasons in Roseau
March through May
March through May in Roseau runs hot, with daytime highs averaging 82°F (28°C) and nights around 76°F (24°C); expect showers on roughly 49 days across the season.
June through August
June through August in Roseau brings hot afternoons, with daytime highs averaging 84°F (29°C) and nights around 78°F (25°C); expect showers on roughly 64 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
September through November
September through November in Roseau runs hot, with daytime highs averaging 84°F (29°C) and nights around 78°F (25°C); expect showers on roughly 60 days across the season.
December through February
December through February in Roseau is mild and warm, with daytime highs averaging 80°F (27°C) and nights around 75°F (24°C); expect showers on roughly 48 days across the season.
Climate questions, answered
What is the average temperature in Roseau?
Is Roseau hot in summer?
Is Roseau cold in winter?
How many rainy days does Roseau get in a year?
Best time to visit Roseau
The best time to visit Roseau is generally December to May, when these months combine the driest skies with the most comfortable heat. Daytime temperatures in that window typically sit near 81°F (27°C).
Pack for Roseau with a compact umbrella or rain shell - showers are a regular feature; moisture-wicking fabrics to cope with the humidity. Evenings can feel noticeably cooler than afternoons - September nights average 78°F (26°C).
Roseau temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.