nomadseason

Monthly climate in Portsmouth, Dominica

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Portsmouth features a tropical rainforest climate (Af).Temperatures typically range between 25 °C (77 °F) and 27 °C (82 °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 840 mm (33.1 inches) and receives 187 rainy days on the 1 mm (0.04 inches) threshold annually.Portsmouth enjoys an average of 3934 hours of sunshine throughout the year, and daylight varies from 11 hours 12 minutes to 13 hours 1 minutes per day.

Monthly average temperatures in Portsmouth, Dominica §

The warmest months in Portsmouth are August, September and October, with daily mean temperatures ranging from 27 to 27 °C (81 - 82 °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, Portsmouth 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 Portsmouth, Dominica.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 27°C
(80°F)		 26°C
(80°F)		 26°C
(80°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(83°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 maximum 26°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 high 26°C
(79°F)		 25°C
(78°F)		 25°C
(78°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)		 28°C
(82°F)		 27°C
(81°F)		 26°C
(80°F)
Daily mean 25°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
(81°F)		 27°C
(81°F)		 27°C
(82°F)		 27°C
(81°F)		 26°C
(80°F)		 26°C
(79°F)
Average low 25°C
(76°F)		 24°C
(76°F)		 24°C
(76°F)		 25°C
(77°F)		 26°C
(78°F)		 26°C
(79°F)		 26°C
(79°F)		 26°C
(80°F)		 27°C
(80°F)		 26°C
(80°F)		 26°C
(79°F)		 25°C
(77°F)
Mean minimum 23°C
(74°F)		 23°C
(73°F)		 23°C
(74°F)		 23°C
(75°F)		 24°C
(76°F)		 25°C
(77°F)		 25°C
(77°F)		 25°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)		 25°C
(77°F)		 24°C
(75°F)
Minimum 23°C
(73°F)		 22°C
(72°F)		 23°C
(73°F)		 23°C
(74°F)		 24°C
(75°F)		 23°C
(74°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)

Compare climate in Portsmouth with other places

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

Monthly average precipitation in Portsmouth, Dominica §

Portsmouth usually has the most precipitation in August, September and October, with an average of 19 rainy days and 118 mm (4.6 inches) of precipitation per month.The driest months in Portsmouth are January, March and April. On average, 34 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Portsmouth, Dominica.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 35 (1.4) 35 (1.4) 35 (1.4) 33 (1.3) 38 (1.5) 66 (2.6) 91 (3.6) 112 (4.4) 118 (4.6) 122 (4.8) 99 (3.9) 56 (2.2)
Average precipitation days (≥ 1 mm) 12 12 14 12 10 14 21 20 17 20 18 17

Monthly sunshine hours in Portsmouth, Dominica §

The sunniest months in Portsmouth are May, July and August, when the sun shines an average of 11 hours 26 minutes a day.Least sunny months in Portsmouth: January, February and November receive an average of 9 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Portsmouth, Dominica.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 267 305 347 340 358 332 354 349 317 320 311 329
Mean daily daylight hours 11h 18m 11h 37m 12h 2m 12h 29m 12h 50m 13h 1m 12h 55m 12h 36m 12h 11m 11h 45m 11h 23m 11h 12m

Solar UV radiation in Portsmouth, Dominica §

Portsmouth 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 Portsmouth UV Index data.

Average daily maximum UV levels by month for Portsmouth, Dominica.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 10 11 13 14 14 13 14 13 13 12 10 9