Portsmouth weather in January 2025

Expect 28°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Portsmouth in January. Check more long-term weather averages for Portsmouth in January before you book your next holiday to Dominica in 2025/2026.

  • 28°C maximum daytime temperature in January in Portsmouth28
    28°C max day temperature
  • 7 hours of sunshine per day
  • 18 days with some rainfall in January in Portsmouth18
    18 days with some rainfall
  • 21°C minimum night-time temperature in January in Portsmouth21
    21°C min night temperature
  • 11 hours of daylight per day in January in Portsmouth11
    11 hours of daylight per day
  • Moderate heat & humidity in January in PortsmouthM
    Moderate heat & humidity
  • 144 mm monthly rainfall in January in Portsmouth144
    144 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in January in Portsmouth9
    9 (Very High) UV index
  • 27°C sea temperature in January in Portsmouth27
    27°C sea temperature

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The January 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 January?

Daytime temperatures usually reach 28°C in Portsmouth in January with moderate heat and humidity, falling to 21°C at night.

How sunny is it in Portsmouth in January?

There are normally 7 hours of bright sunshine each day in Portsmouth in January - that's 59% of daylight hours.

How warm is the sea around Portsmouth in January?

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

Does it rain in Portsmouth in January?

There are usually 18 days with some rain in Portsmouth in January and the average monthly rainfall is 144mm.

Portsmouth January sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st January 2025 06:33 17:46
Thursday, 16th January 2025 06:36 17:55
Friday, 31st January 2025 06:35 18:03

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