Portsmouth weather in January 2025

Expect 1°C daytime maximum temperatures in the shade with on average 5 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 New Hampshire in 2025/2026.

  • 1°C maximum daytime temperature in January in Portsmouth1
    1°C max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in January in Portsmouth11
    11 days with some rainfall
  • -11°C minimum night-time temperature in January in Portsmouth-11
    -11°C min night temperature
  • 9 hours of daylight per day in January in Portsmouth9
    9 hours of daylight per day
  • No heat & humidity in January in Portsmouth0
    No heat & humidity
  • 87 mm monthly rainfall in January in Portsmouth87
    87 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Portsmouth1
    1 (Low) UV index
  • 5°C sea temperature in January in Portsmouth5
    5°C sea temperature

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The January weather guide for New Hampshire (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 cold is it in Portsmouth in January?

Daytime temperatures usually reach 1°C in Portsmouth in January, falling to -11°C at night.

How sunny is it in Portsmouth in January?

There are normally 5 hours of bright sunshine each day in Portsmouth in January - that's 55% of daylight hours.

Is the sea cold around Portsmouth in January?

The average sea temperature around Portsmouth in January is 5°C.

Does it rain in Portsmouth in January?

There are usually 11 days with some rain in Portsmouth in January and the average monthly rainfall is 87mm. Rain may fall as snow in this month.

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 07:15 16:19
Thursday, 16th January 2025 07:11 16:35
Friday, 31st January 2025 06:59 16:55

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