Portsmouth Weather in December
December in Portsmouth sees daytime temperatures around 28°C (82°F) and lows of 25°C (77°F) at night. With around 67 mm (2.6 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Portsmouth in December
The climate data from previous years indicates about 19 days of rain, averaging 67 mm (2.6 in) for the month. This is a month with many wet days but modest rainfall totals, so showers are generally light and easy to manage.
Temperature in Portsmouth in December
Portsmouth in December is worth a visit. The temperature is perfect, with 28°C (82°F) during the day and 25°C (77°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Portsmouth in December
The city usually sees around 190 hours of sunlight, indicating many sunny days — a great month for sightseeing.If you're inclined towards comfortable temperatures and drier conditions, December is a good time to visit Portsmouth.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Dominica, check out our Portsmouth's climate page.
Portsmouth Temperature in December
Min Temperature
25°C (77°F)
Max Temperature
28°C (82°F)
Chance of Rain
62%
Precipitation
67 mm (2.6 in)
Rainy days
19 days
Humidity
72% *
Sunshine
190 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Portsmouth typically stay consistent throughout December, with daily highs averaging around 28°C (82°F). Nights are warm, with lows around 22°C (72°F).
Average temperatures in December
Historical weather for Portsmouth in December
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 December
Based on 35 years of weather observations (1990-2025), these are the most extreme conditions recorded in Portsmouth.
- On December 5, 2013, temperatures climbed to 34°C (93°F), marking the warmest December day on record.
- Portsmouth experienced its chilliest December day on December 24, 2013, reaching only 25°C (77°F).
- The lowest overnight temperature recorded in December was 15°C (59°F) (December 24, 1991).
Best Places in Dominica in December
Find out more about the weather in Dominica and which places have the best travel conditions in this month. See all of Dominica in December →
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What to Wear in Portsmouth in December
Warm but pleasant conditions in Portsmouth in December. 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Portsmouth in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Dominica, check out our Portsmouth's climate page.
Temperature Rainfall Sunshine Humidity
See the full Portsmouth climate overview or explore weather in Dominica.
