Portsmouth weather in January 2025

Expect 34°F 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.

  • 34°F maximum daytime temperature in January in Portsmouth34
    34°F max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in January in Portsmouth11
    11 days with some rainfall
  • 12°F minimum night-time temperature in January in Portsmouth12
    12°F 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
  • 3.4 inches monthly rainfall in January in Portsmouth3.4
    3.4 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Portsmouth1
    1 (Low) UV index
  • 41°F sea temperature in January in Portsmouth41
    41°F 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)  |  Imperial (°F)

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How cold is it in Portsmouth in January?

Daytime temperatures usually reach 34°F in Portsmouth in January, falling to 12°F 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.

How warm is the sea around Portsmouth in January?

The average sea temperature around Portsmouth in January is 41°F.

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 3.4 inches. 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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