Roseau, Dominica Climate & Monthly Averages
The climate of 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.
Climate quick facts
- 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%
Temperatures through the year
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.
Rain, sun and snow
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.
How Roseau compares
- 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.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate 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% |
Roseau month by month
Average high and low for each month, with the bar showing where it sits in Roseau's year (left is the coldest night, right is the 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
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
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); 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.
Climate questions, answered
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?
Best time to visit Roseau
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.
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.
Roseau temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.