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Portsmouth Weather in May
In Portsmouth, May brings high daytime temperatures around 28°C (82°F), with nights cooling to 26°C (79°F). Expect quite a bit of rainfall this month.
Rainfall in Portsmouth in May
Looking at the last 30 years, the data shows about 17 days with rain, averaging 64 mm (2.5 in) for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Portsmouth in May
May is a excellent month in Portsmouth, with 28°C (82°F) during the day and 26°C (79°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights stay warm at around 26°C (79°F), so light bedding and good ventilation are worth thinking about.
Sunshine in Portsmouth in May
With approximately 243 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, June, July and December typically offer the best weather for Portsmouth.
Portsmouth Temperature in May
Min Temperature
26°C (79°F)
Max Temperature
28°C (82°F)
Chance of Rain
57%
Precipitation
64 mm (2.5 in)
Rainy days
17 days
Humidity
67% *
Sunshine
243 hours *
Percentage Sunshine
*
* Data from: Douglas-Charles Airport, Dominica (18 KM, 11 Miles).
Portsmouth Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Portsmouth - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Portsmouth typically stay consistent throughout May, with daily highs averaging around 28°C (82°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in May
Historical weather records for Portsmouth in May
Browse day-by-day weather records for Portsmouth spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Portsmouth historical weather extremes in May
Our historical data for Portsmouth spans 1991 to 2026, revealing these weather extremes.
- Portsmouth recorded its highest May temperature of 34°C (93°F) on May 18, 2024.
- The lowest daytime temperature in May was 25°C (77°F), recorded on May 7, 2011.
- Portsmouth registered its coldest May night on May 24, 2023, with temperatures dropping to 12°C (54°F).
Best Places in Dominica in May
Find out more about the weather in Dominica and which places have the best travel conditions in this month. See all of Dominica in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Portsmouth in May
Warm but pleasant conditions in Portsmouth in May. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Wet weather is likely, so pack waterproof gear for multiple rainy days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Portsmouth in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming9/10 -
Cycling8/10 -
Walking8/10 -
Camping7/10 -
Outdoor sports8/10
Portsmouth 3-Day Forecast
More climate data for Portsmouth
Temperature Rainfall Sunshine Humidity
See the full Portsmouth climate overview or explore weather in Dominica.
Popular in May
Where to go in May - average daytime high across popular destinations.
Scotts Head Village
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