Roseau climate — normals and trends
Roseau (Dominica) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.8 °C and it receives 821 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is September (26.8 °C on average) and the coldest is February (24.6 °C). Rainfall peaks in September.
Roseau averages 0 frost days, 0 hot days (≥ 30 °C) and 191 rainy days per year.
Roseau has warmed by +0.7 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.
The hottest day of the period reached 29.6 °C (on 27 August 2023) and the coldest 20.1 °C (on 7 January 1950).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
RoseauSaint George Parish
- coords
- 15.30°, -61.39°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.8°C
Average daily high
26.4°C
Average daily low
25.1°C
Annual rainfall
821mm
Sunshine / day
11.3h
Mean relative humidity
80%
Average peak wind
31.4km/h
Seasonal range
2.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
191 d/yr
Annual snowfall
0.0 cm
Average feels-like high
28.7 °C
Average feels-like low
25.9 °C
Average peak gust
43.0 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
21.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.7 °C
since 1940
+0.1 °C per decade · r² = 0.38 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
29.6 °C
27 August 2023
Coldest day
20.1 °C
7 January 1950
Wettest day
102 mm
29 August 1979
Windiest day
87.3 km/h
17 August 2007
Strongest gust
125.6 km/h
4 August 1980
Hottest feels-like
37.3 °C
23 August 2023
Coldest feels-like
17.2 °C
6 January 1950
Sunniest day
12.6 h
8 July 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 26.5 °C | +1.2 °C | 61 mm | +22 mm |
| Feb | 26.0 °C | +0.9 °C | 56 mm | +30 mm |
| Mar | 26.3 °C | +1.1 °C | 25 mm | +0 mm |
| Apr | 26.3 °C | +0.5 °C | 50 mm | +15 mm |
| May | 27.1 °C | +0.6 °C | 82 mm | +32 mm |
| Jun | 27.2 °C | +0.3 °C | 45 mm | -15 mm |
| Jul | 27.5 °C | +0.4 °C | 57 mm | -28 mm |
| Aug | 28.3 °C | +0.9 °C | 90 mm | -22 mm |
| Sep | 28.4 °C | +0.9 °C | 130 mm | +11 mm |
| Oct | 28.2 °C | +0.9 °C | 148 mm | +31 mm |
| Nov | 27.4 °C | +0.6 °C | 66 mm | -35 mm |
| Dec | 26.5 °C | +0.5 °C | 47 mm | -6 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Roseau?
Roseau has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.8 °C and it receives 821 mm of precipitation per year.
What is the hottest day ever recorded in Roseau?
The hottest day measured in Roseau between 1940 and 2025 was 27 August 2023, reaching 29.6 °C.
What is the coldest day in Roseau?
The coldest day measured in Roseau between 1940 and 2025 was 7 January 1950, at 20.1 °C.
Does it snow in Roseau?
Almost never: Roseau sees virtually no snow, with about 0 frost days per year.
Has the climate of Roseau warmed?
Yes: Roseau warmed by +0.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Roseau?
The wettest day measured in Roseau between 1940 and 2025 was 29 August 1979, with 102 mm of rain in 24 hours.
What was the windiest day in Roseau?
The windiest day measured in Roseau between 1940 and 2025 was 17 August 2007, with winds reaching 87.3 km/h.
What is the warmest month in Roseau?
The warmest month in Roseau is September (26.8 °C on average); the coldest is February (24.6 °C).
How much does it rain in Roseau?
Roseau receives on average 821 mm of precipitation per year, spread over about 191 rainy days.
Is it sunny in Roseau?
Roseau gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
Are there tropical nights in Roseau?
Yes: Roseau has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Roseau?
In Roseau, between 1940 and 2025, the highest apparent temperature reached 37.3 °C on 23 August 2023, and the lowest was 17.2 °C on 6 January 1950.
Compare Roseau with another city
Pick a second city: its normals will be set against these, indicator by indicator.