Portsmouth weather in December 2025

Expect 29°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Portsmouth in December. Check more long-term weather averages for Portsmouth in December before you book your next holiday to Dominica in 2025/2026.

  • 29°C maximum daytime temperature in December in Portsmouth29
    29°C max day temperature
  • 6 hours of sunshine per day
  • 18 days with some rainfall in December in Portsmouth18
    18 days with some rainfall
  • 22°C minimum night-time temperature in December in Portsmouth22
    22°C min night temperature
  • 11 hours of daylight per day in December in Portsmouth11
    11 hours of daylight per day
  • Moderate heat & humidity in December in PortsmouthM
    Moderate heat & humidity
  • 201 mm monthly rainfall in December in Portsmouth201
    201 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in December in Portsmouth8
    8 (Very High) UV index
  • 27°C sea temperature in December in Portsmouth27
    27°C 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Portsmouth in December?

Daytime temperatures usually reach 29°C in Portsmouth in December with moderate heat and humidity, falling to 22°C at night.

How sunny is it in Portsmouth in December?

There are normally 6 hours of bright sunshine each day in Portsmouth in December - that's 57% of daylight hours.

How warm is the sea around Portsmouth in December?

The average sea temperature around Portsmouth in December is 27°C.

Does it rain in Portsmouth in December?

There are usually 18 days with some rain in Portsmouth in December and the average monthly rainfall is 201mm.

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.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 06:17 17:33
Tuesday, 16th December 2025 06:25 17:38
Wednesday, 31st December 2025 06:32 17:46

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