Roseau climate

Name: Roseau
Address: DM

Roseau is warmest in September, with average highs of 28 °C, and coldest in February, when nights average 24 °C. September is the wettest month (123 mm) and March the driest (26 mm). Figures are 1991–2020 climate normals.

Across a full year Roseau averages 818 mm of rain and 359 days above 25 °C.

Dominica · population 16,571 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month September 28 °C
Coldest month February 24 °C
Driest month March 26 mm
Wettest month September 123 mm
Least cloud January 31 % cloud
Hottest on record September 31 °C
Coldest on record January 21 °C
Warmest sea September 29 °C

What to expectRoseau through the year

Roseau changes little through the year. Average daily highs stay between 26 and 28 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 359 days a year reach 25 °C, 1 of them reach 30 °C. The warmest reading in the 1991–2020 record is 31 °C, in September.

Rain is strongly seasonal. September averages 123 mm against 26 mm in March — 4.8 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Roseau is warmest in September at 29 °C and coldest in February at 27 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	26.0 °C	38 mm	31 %
February	25.9 °C	26 mm	31 %
March	26.3 °C	26 mm	35 %
April	27.0 °C	35 mm	44 %
May	27.7 °C	48 mm	54 %
June	28.0 °C	53 mm	58 %
July	28.0 °C	82 mm	49 %
August	28.3 °C	106 mm	50 %
September	28.4 °C	123 mm	59 %
October	28.0 °C	120 mm	56 %
November	27.3 °C	106 mm	47 %
December	26.6 °C	55 mm	37 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	26.0 °C	24.0 °C	25.0 °C	27.7 °C	20.7 °C	29	0
February	25.9 °C	23.9 °C	24.8 °C	28.7 °C	21.0 °C	26	0
March	26.3 °C	24.0 °C	25.1 °C	29.0 °C	21.8 °C	29	0
April	27.0 °C	24.6 °C	25.7 °C	29.3 °C	22.0 °C	30	0
May	27.7 °C	25.4 °C	26.5 °C	30.0 °C	23.1 °C	31	0
June	28.0 °C	25.8 °C	26.8 °C	30.2 °C	23.5 °C	30	0
July	28.0 °C	25.7 °C	26.9 °C	30.0 °C	23.9 °C	31	0
August	28.3 °C	25.9 °C	27.1 °C	30.4 °C	24.1 °C	31	0
September	28.4 °C	26.1 °C	27.2 °C	31.0 °C	24.2 °C	30	1
October	28.0 °C	25.8 °C	26.9 °C	30.0 °C	23.9 °C	31	0
November	27.3 °C	25.3 °C	26.3 °C	29.2 °C	23.1 °C	30	0
December	26.6 °C	24.7 °C	25.6 °C	28.7 °C	22.3 °C	31	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	38 mm	12	11 h/day	31 %	79 %	32 km/h	26.9 °C
February	26 mm	7	12 h/day	31 %	77 %	32 km/h	26.6 °C
March	26 mm	8	12 h/day	35 %	77 %	30 km/h	26.6 °C
April	35 mm	9	12 h/day	44 %	79 %	29 km/h	27.1 °C
May	48 mm	11	13 h/day	54 %	81 %	29 km/h	27.6 °C
June	53 mm	11	13 h/day	58 %	81 %	32 km/h	27.9 °C
July	82 mm	16	13 h/day	49 %	83 %	32 km/h	28.1 °C
August	106 mm	18	13 h/day	50 %	83 %	29 km/h	28.6 °C
September	123 mm	17	12 h/day	59 %	83 %	26 km/h	29.0 °C
October	120 mm	19	12 h/day	56 %	83 %	26 km/h	28.9 °C
November	106 mm	18	11 h/day	47 %	83 %	28 km/h	28.5 °C
December	55 mm	14	11 h/day	37 %	80 %	31 km/h	27.6 °C

How Roseau compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Roseau	28 °C	24 °C	818 mm	359
Fort-de-France · Martinique	29 °C	24 °C	1,000 mm	365
Basse-Terre · Guadeloupe	30 °C	24 °C	816 mm	364
Castries · Saint Lucia	29 °C	23 °C	813 mm	365
Plymouth · Montserrat	29 °C	24 °C	775 mm	361
Saint John’s · Antigua and Barbuda	29 °C	24 °C	837 mm	361
Kingstown · Saint Vincent and the Grenadines	29 °C	25 °C	1,022 mm	365

Planning a trip? See the best time to visit Roseau.

QuestionsCommon questions about Roseau’s climate

When is the best time to visit Roseau?

That depends on what you want, so the honest answer is a comparison rather than a single month. January, February, March sit closest to 20 °C on average, September is the warmest month and March the driest. The month-by-month table above has the full picture.

How hot does Roseau get?

In September, the warmest month, daily highs average 28 °C. About 1 days a year pass 30 °C. The highest value in the 1991–2020 record is 31 °C.

How cold does it get in winter?

Nights average 24 °C in February, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Roseau?

September, averaging 123 mm over 17 days with rain. The driest month is March with 26 mm. The year as a whole averages 818 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Roseau rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.