Roseau, Dominica Climate & Monthly Averages
Roseau has a tropical wet-and-dry climate. September is the hottest month, averaging 85° by day; February is the coldest at 80°.
Rain, not cold, divides the year in Roseau
Roseau has one of the steadier climates in our dataset. Average highs move only 3°C across the whole year - from 80°F (26°C) in February to 85°F (29°C) in September - so the practical difference between seasons here is rainfall and daylight, not warmth.
The wet-and-dry rhythm at a glance
Relative humidity averages 80% across the year, more humid than roughly 84% of the cities we track - enough that summer afternoons feel hotter than the thermometer says, which is what the dew point converter is for. February sits at the other end of the year: 80°F (26°C) by day, 74°F (23°C) at night. September is the warm end of the year, averaging 85°F (29°C) by day and 78°F (26°C) overnight.
Between the average September and the average February lie 3°C, a narrower spread than all but 7% of the 3496 cities in our dataset.
April is the brightest month at 11.8 hours of sun a day, against an annual average of 11.1 - sunnier than 97% of the 3496 cities in our dataset. Days and nights are about 3°C apart on average - narrower than almost anywhere else we cover. September is the wettest month at 5.5 inches (139 mm) over 19 days; April is the driest.
The gridded 2015-2024 daily record for this location tops out at 90°F (32°C) and bottoms at 69°F (20°C) - decade extremes, not all-time station records.
More climate facts for Roseau
- Hottest month: September - highs near 85°F (29°C)
- Coldest month: February - highs near 80°F (26°C)
- Decade extremes (2015-2024): 90°F (32°C) high · 69°F (20°C) low
- Wettest month: September (19 rainy days) · Sunniest: April (11.8 h sun/day)
- Climate type: tropical wet-and-dry
- Annual swing: 3°C between the average warmest and coolest month · day to night: 3°C
- Average humidity: 80%
Choosing the right part of the year in Roseau
Choose dates by rain, not just temperature
The best time to visit Roseau is generally December to May, when humidity and rainfall are at their lowest, which is what actually varies here. Daytime temperatures in that window sit near 81°F (27°C), with rain on about 16 days a month. For the same question asked the other way round, see where else is warm in December.
What the humidity changes
Pack for Roseau with light clothing for the warm months, proper waterproofs rather than an umbrella - wet days are the norm here and moisture-wicking fabrics for the humidity. September nights average 78°F (26°C), so evenings rarely match the afternoons.
Warm all year: the monthly rain pattern
Each card shows the average high and low. The bar places that month between Roseau's coldest night and warmest afternoon.
January
- Rain
- 15 days
- Sunshine
- 10.8 h
- Daylight
- 11.3 h
February
- Rain
- 15 days
- Sunshine
- 11.0 h
- Daylight
- 11.6 h
March
- Rain
- 16 days
- Sunshine
- 11.5 h
- Daylight
- 12.0 h
April
- Rain
- 18 days
- Sunshine
- 11.8 h
- Daylight
- 12.5 h
May
- Rain
- 16 days
- Sunshine
- 11.5 h
- Daylight
- 12.8 h
June
- Rain
- 19 days
- Sunshine
- 11.3 h
- Daylight
- 13.0 h
July
- Rain
- 23 days
- Sunshine
- 11.3 h
- Daylight
- 12.9 h
August
- Rain
- 22 days
- Sunshine
- 11.2 h
- Daylight
- 12.6 h
September
- Rain
- 19 days
- Sunshine
- 11.0 h
- Daylight
- 12.2 h
October
- Rain
- 20 days
- Sunshine
- 10.6 h
- Daylight
- 11.8 h
November
- Rain
- 21 days
- Sunshine
- 10.3 h
- Daylight
- 11.4 h
December
- Rain
- 18 days
- Sunshine
- 10.5 h
- Daylight
- 11.2 h
Looking for warmer alternatives? Browse warm places by month, or compare Roseau's coolest part of the year: January, February, March.
Monthly temperature and rain table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 80° | 74° | 15 | 2.5 in | 10.8 h/day | 11.3 h | 48% | 78% |
| February | 80° | 74° | 15 | 2.5 in | 11.0 h/day | 11.6 h | 54% | 78% |
| March | 80° | 74° | 16 | 2.7 in | 11.5 h/day | 12.0 h | 52% | 78% |
| April | 82° | 75° | 18 | 2.2 in | 11.8 h/day | 12.5 h | 58% | 79% |
| May | 83° | 77° | 16 | 2.3 in | 11.5 h/day | 12.8 h | 50% | 79% |
| June | 83° | 78° | 19 | 3.3 in | 11.3 h/day | 13.0 h | 62% | 81% |
| July | 83° | 78° | 23 | 5.0 in | 11.3 h/day | 12.9 h | 75% | 83% |
| August | 84° | 78° | 22 | 4.8 in | 11.2 h/day | 12.6 h | 71% | 83% |
| September | 85° | 78° | 19 | 5.5 in | 11.0 h/day | 12.2 h | 63% | 82% |
| October | 84° | 78° | 20 | 4.5 in | 10.6 h/day | 11.8 h | 66% | 82% |
| November | 83° | 77° | 21 | 5.0 in | 10.3 h/day | 11.4 h | 70% | 82% |
| December | 81° | 75° | 18 | 3.2 in | 10.5 h/day | 11.2 h | 59% | 80% |
How Roseau compares for rain and warmth
- Rain or snow reaches the ground on 222 days a year - more wet days than 94% of the 3496 cities we track.
- Roseau averages 79°F (26°C) across the year - warmer than 89% of the 3496 cities we track.
These comparisons use the same ten-year window for every city in the dataset.
How the calendar changes in warm-weather 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); rain falls on around 49 of the 90 days. Daylight is generous - around 11.6 hours of sun a day.
June through August
June through August in Roseau is hot, with daytime highs averaging 84°F (29°C) and nights around 78°F (25°C); rain falls on around 64 of the 90 days. Daylight is generous - around 11.3 hours of sun a day.
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); rain falls on around 60 of the 90 days. Daylight is generous - around 10.6 hours of sun a day.
December through February
Through December through February, Roseau brings comfortable warmth: 80°F (27°C) by day, 75°F (24°C) after dark, and rain falls on around 48 of the 90 days. Daylight is generous - around 10.8 hours of sun a day.
Questions about heat and rain in Roseau
What should I wear in Roseau?
How does Roseau compare to other cities?
How humid does Roseau get?
Are nights cold in Roseau?
Is Roseau hot in summer?
How cold does Roseau get in winter?
Roseau temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.