The 5 most beautiful lakes in Canada
Explore Canada's stunning lakes: Lake Louise, Lake Superior, Maligne Lake, Emerald Lake, and Lake Okanagan, each offering unique beauty and activities.
Portsmouth Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Portsmouth.
–
Climate overview of Portsmouth
The climate in Portsmouth, Dominica, is remarkably consistent, with temperatures year-round averaging 28°C (82°F). The warmest month is September at 29°C (84°F), and the coolest is February at 27°C (81°F).
The city receives around 973 mm (38 in) of rainfall per year. It experiences a distinct dry season from February to March. October is the wettest month and March the driest. The sunniest month is April, with 8.2 hours of sunshine per day on average.
Portsmouth Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Portsmouth - and find the best time to visit.
Monthly Temperature in Portsmouth
In Portsmouth temperatures are generally consistent throughout the year. On average, daytime temperatures range from a comfortable 29°C (84°F) in September to a comfortable 27°C (81°F) in February.
Nighttime temperatures range from 26°C (79°F) in September to 24°C (75°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Portsmouth
On average, Portsmouth receives a reasonable amount of rainfall, with an annual precipitation of 973 mm (38 in). The seasons in Portsmouth bring significant changes in precipitation. The wettest month, October, receives high rainfall, with an average of 137 mm (5.4 in) of precipitation. This rainfall is distributed across 19 rainy days.
In contrast, the driest month, March, experiences much less rainfall, totaling 33 mm (1.3 in) over 15 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Portsmouth Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Portsmouth
Portsmouth enjoys sunny spells year-round. April sees up to 8.2 hours of daily sunshine, perfect for a sunny trip. December, the least sunny month, still offers a generous 6.3 hours of sun despite this cloudier time of the year.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Douglas-Charles Airport, Dominica (18 KM, 11 Miles).
Daily hours of sunshine
Data from: Douglas-Charles Airport, Dominica (18 KM, 11 Miles).
Humidity in Portsmouth by Month
The relative humidity is high throughout the year in Portsmouth.
The city experiences its highest humidity in November, reaching 74%. In April, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Douglas-Charles Airport, Dominica (18 KM, 11 Miles).
Best Time to Visit Portsmouth
The most comfortable overall weather for exploring Portsmouth is usually found in January, February, March, April, May, June, July and December. Conditions are generally least comfortable in August, September, October and November.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
excellent
Feb
excellent
Mar
excellent
Apr
excellent
May
excellent
Jun
excellent
Jul
excellent
Aug
very good
Sep
very good
Oct
very good
Nov
very good
Dec
excellent
- Best overall: January, February, March, April, May, June, July and December
- Warmest weather: May, June, July, August, September, October and November
- Most sunshine: April, May and August
- Fewest rainy days: February, March, April and May
- Seasonal pattern: A distinct dry season from February to March
Frequently asked questions about the climate in Portsmouth
What is the best time to visit Portsmouth?
January, February, March, April, May, June, July and December typically offer the most optimal weather in Portsmouth. In contrast, August, September, October and November tend to have less optimal conditions. Portsmouth has a distinct dry season from February to March.
What temperatures can I expect in Portsmouth?
Daytime highs range from 27°C (81°F) in February to 29°C (84°F) in September. Nighttime lows range from 24°C (75°F) to 26°C (79°F). Temperatures stay relatively stable year-round.
How much rain does Portsmouth get?
Annual rainfall is around 973 mm (38 in). October is the wettest month with 137 mm (5.4 in), while March is the driest with 33 mm (1.3 in).
How sunny is Portsmouth?
Portsmouth receives around 2,630 hours of sunshine per year. April is the sunniest month with 245 hours, while December is the cloudiest with just 190 hours. Overall, Portsmouth enjoys abundant sunshine.
Portsmouth 3-Day Forecast
Portsmouth on the map
Portsmouth is highlighted - select any city to see its climate.
Popular in September
Where to go in September - average daytime high across popular destinations.
Salisbury
29°C (84°F) Scotts Head Village29°C (84°F) Roseau29°C (84°F) Marigot29°C (84°F) Portsmouth29°C (84°F) Calibishie29°C (84°F) Pont Cassé29°C (84°F) Castle Bruce
29°C (84°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
The 5 most beautiful lakes in Canada
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Lake Atitlan: the most beautiful lake in the world
At Lake Atitlan you will be enchanted by beautiful volcanoes, amazing sunsets and the serene tranquility. Mix this with the vibrant Mayan community and you'll understand why Atitlan has something magical.