nomadseason

Monthly climate in Roseau, Dominica

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Roseau features a tropical rainforest climate (Af). Temperatures typically range between 25 °C (77 °F) and 27 °C (81 °F) through the year, but rarely can drop to 22 °C (72 °F) or can rise to as high as 29 °C (84 °F). The average annual precipitation amounts to about 829 mm (32.6 inches) and receives 192 rainy days on the 1 mm (0.04 inches) threshold annually. Roseau enjoys an average of 3923 hours of sunshine throughout the year, and daylight varies from 11 hours 13 minutes to 13 hours 0 minutes per day.

Monthly average temperatures in Roseau, Dominica

The warmest months in Roseau are August, September and October, with daily mean temperatures ranging from 27 to 27 °C (81 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 25 to 25 °C (77 - 78 °F) throughout the day. On average each year, Roseau experiences 320 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Roseau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum27°C
(80°F)		26°C
(80°F)		26°C
(80°F)		27°C
(81°F)		28°C
(82°F)		28°C
(82°F)		28°C
(83°F)		29°C
(84°F)		29°C
(84°F)		29°C
(84°F)		28°C
(82°F)		28°C
(82°F)
Mean maximum26°C
(80°F)		26°C
(79°F)		26°C
(79°F)		27°C
(80°F)		27°C
(81°F)		27°C
(82°F)		28°C
(82°F)		28°C
(83°F)		29°C
(84°F)		28°C
(83°F)		28°C
(82°F)		27°C
(81°F)
Average high26°C
(78°F)		25°C
(78°F)		25°C
(78°F)		26°C
(79°F)		27°C
(80°F)		27°C
(81°F)		27°C
(81°F)		28°C
(82°F)		28°C
(83°F)		28°C
(82°F)		27°C
(81°F)		26°C
(80°F)
Daily mean25°C
(78°F)		25°C
(77°F)		25°C
(77°F)		25°C
(78°F)		26°C
(79°F)		27°C
(80°F)		27°C
(80°F)		27°C
(81°F)		27°C
(81°F)		27°C
(81°F)		26°C
(80°F)		26°C
(79°F)
Average low25°C
(76°F)		24°C
(76°F)		24°C
(76°F)		25°C
(77°F)		25°C
(78°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		27°C
(80°F)		26°C
(79°F)		26°C
(79°F)		25°C
(78°F)
Mean minimum23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		24°C
(75°F)		24°C
(76°F)		25°C
(77°F)		25°C
(77°F)		25°C
(77°F)		25°C
(78°F)		25°C
(77°F)		25°C
(77°F)		24°C
(75°F)
Minimum23°C
(73°F)		22°C
(72°F)		23°C
(73°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		25°C
(77°F)		25°C
(77°F)		25°C
(78°F)		25°C
(77°F)		25°C
(76°F)		24°C
(75°F)

Compare climate in Roseau with other places

Compare temperature, precipitation, sunshine, UV index in Roseau, Dominica with other places around the world.

Monthly average precipitation in Roseau, Dominica

Roseau usually has the most precipitation in August, September and October, with an average of 19 rainy days and 114 mm (4.5 inches) of precipitation per month. The driest months in Roseau are March, April and May. On average, 34 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Roseau. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)36 (1.4)36 (1.4)34 (1.3)32 (1.3)35 (1.4)68 (2.7)97 (3.8)109 (4.3)114 (4.5)117 (4.6)97 (3.8)53 (2.1)
Average precipitation days (≥ 1 mm)131314121014202117202018

Monthly sunshine hours in Roseau, Dominica

The sunniest months in Roseau are March, May and July, when the sun shines an average of 11 hours 22 minutes a day. Least sunny months in Roseau: January, February and November receive an average of 9 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Roseau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours266304347339357327353347318319311329
Mean daily daylight hours11h 19m11h 38m12h 2m12h 28m12h 50m13h 0m12h 55m12h 36m12h 11m11h 45m11h 23m11h 13m

Solar UV radiation in Roseau, Dominica

Roseau experiences the highest level of ultraviolet (UV) radiation in April, May and July, when the maximum UV index can reach values of 14 - 14, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 10. For more detailed information, check out our hourly Roseau UV Index data.

Average daily maximum UV levels by month for Roseau. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)10111314141314131312109