Portsmouth weather in December 2025

Q: How hot is it in Portsmouth in December?

Daytime temperatures usually reach 29°C in Portsmouth in December with high heat and humidity, falling to 21°C at night.

Q: How sunny is it in Portsmouth in December?

There are normally 7 hours of bright sunshine each day in Portsmouth in December - that's 58% of daylight hours.

Q: How warm is the sea around Portsmouth in December?

The average sea temperature around Portsmouth in December is 28°C.

Q: Does it rain in Portsmouth in December?

There are usually 19 days with some rain in Portsmouth in December and the average monthly rainfall is 176mm.

Expect daytime maximum temperatures of 84°F in Portsmouth, Dominica in December based on long-term weather averages. There are 6 hours of sunshine per day on average with 18 days with some rainfall and typically 7.9 inches of rainfall in the month.

84
84°F max day temperature
6
6 hours of sunshine per day
18
18 days with some rainfall
72
72°F min night temperature
11
11 hours of daylight per day
M
Moderate heat & humidity
7.9
7.9 inches of monthly rainfall
8
8 (Very High) UV index
81
81°F sea temperature

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The December weather guide for Dominica (Portsmouth) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

How hot is it in Portsmouth in December?

Daytime temperatures usually reach 84°F in Portsmouth in December with high heat and humidity, falling to 70°F at night.

How sunny is it in Portsmouth in December?

There are normally 7 hours of bright sunshine each day in Portsmouth in December - that's 58% of daylight hours.

How warm is the sea around Portsmouth in December?

The average sea temperature around Portsmouth in December is 82°F.

Does it rain in Portsmouth in December?

There are usually 19 days with some rain in Portsmouth in December and the average monthly rainfall is 6.9 inches.

Portsmouth December sunrise & sunset times

Browse the sunrise and sunset times for Portsmouth in December 2025. Select a month to view Portsmouth sunrise and sunset times for the next 12 months.

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