Roseau climate
Roseau (Dominica) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 27 °C81 °F, and about 1,419 mm56 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Roseau climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2780 | 2577 | 2679 | 612.4 |
| Feb | 2780 | 2577 | 2678 | 451.8 |
| Mar | 2780 | 2577 | 2679 | 461.8 |
| Apr | 2781 | 2678 | 2780 | 752.9 |
| May | 2883 | 2780 | 2781 | 1064.2 |
| Jun | 2883 | 2781 | 2882 | 1335.2 |
| Jul | 2983 | 2781 | 2882 | 1576.2 |
| Aug | 2984 | 2882 | 2883 | 1736.8 |
| Sep | 2984 | 2882 | 2883 | 1696.7 |
| Oct | 2984 | 2781 | 2882 | 1997.8 |
| Nov | 2882 | 2780 | 2781 | 1616.3 |
| Dec | 2781 | 2679 | 2780 | 943.7 |
| Year | 2984 | 2577 | 2781 | 1,41956 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 77% | 40% | 5.0 | 11:19 |
| Feb | 76% | 39% | 5.6 | 11:37 |
| Mar | 76% | 44% | 6.3 | 12:01 |
| Apr | 77% | 53% | 6.3 | 12:28 |
| May | 78% | 59% | 6.2 | 12:50 |
| Jun | 79% | 62% | 6.0 | 13:02 |
| Jul | 80% | 54% | 6.1 | 12:57 |
| Aug | 80% | 50% | 6.2 | 12:38 |
| Sep | 80% | 55% | 5.9 | 12:12 |
| Oct | 80% | 56% | 5.3 | 11:46 |
| Nov | 80% | 48% | 4.8 | 11:24 |
| Dec | 78% | 43% | 4.7 | 11:13 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Roseau is like
The warmest month is September, with an average high of 29 °C84 °F and a low of 28 °C82 °F. The coldest is February, when highs average 27 °C80 °F and lows 25 °C77 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 2.6 °C4.6 °F.
It is wet, with about 1,419 mm56 in of precipitation per year. The wettest three-month stretch is August–October, which brings 38% of the annual total. The wettest month is October (199 mm7.8 in), the driest is February (45 mm1.8 in).
Relative humidity ranges from 76% in February to 80% in October. The clearest skies (lowest average cloud amount, 39%) are typical of February. Average wind speed near the ground ranges from 17 km/h (11 mph) in September to 24 km/h (15 mph) in July. Daylight lasts from about 11.2 hours in December to 13.0 hours in June.
Best time to visit Roseau
Based on these averages, the most comfortable months for sightseeing and outdoor activities are January–April. Average highs then reach 27 °C80 °F to 27 °C81 °F. Precipitation is 45 mm1.8 in to 75 mm2.9 in per month.
The most challenging month is October, which is very wet (199 mm7.8 in) and humid (80% relative humidity).
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Roseau
- Wetter months (June–November) — highs 2882 to 29 °C84 °F, lows 2780 to 28 °C82 °F, about 165 mm6.5 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Drier months (December–May) — highs 2780 to 28 °C83 °F, lows 2577 to 27 °C80 °F, about 71 mm2.8 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Roseau compares
The nearest larger place is Fort-de-France, about 85 km to the southeast. Compared with it, Roseau has practically the same average temperature. It receives a similar amount of precipitation.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Fort-de-France (Martinique, Am), Castries (Saint Lucia, Am) and Basse-Terre (Guadeloupe, Aw).
Nearby places
- Climate in Fort-de-France 85 km · 27 °C81 °F · 1,478 mm58 in
- Climate in Basse-Terre 86 km · 27 °C81 °F · 1,171 mm46 in
- Climate in Castries 151 km · 27 °C80 °F · 1,444 mm57 in
- Climate in Plymouth 179 km · 27 °C80 °F · 1,003 mm39 in
- Climate in Saint Johns 208 km · 27 °C81 °F · 1,108 mm44 in
- Climate in Kingstown 239 km · 28 °C82 °F · 682 mm27 in
- Climate in Basseterre 264 km · 27 °C81 °F · 792 mm31 in
- Climate in Bridgetown 310 km · 27 °C81 °F · 777 mm31 in
Frequently asked questions
What is the warmest month in Roseau?
September is the warmest month in Roseau. Its average high is 29 °C (84 °F) and its average low is 28 °C (82 °F).
What is the coldest month in Roseau?
February is the coldest month. Its average high is 27 °C (80 °F) and its average low is 25 °C (77 °F).
When does it rain the most in Roseau?
October is the wettest month with about 199 mm (7.8 in) of precipitation. February is the driest with about 45 mm (1.8 in).
What is the best time to visit Roseau?
Judging by long-term averages, the most comfortable months are January–April.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.