Portsmouth weather in January 2025

Expect 82°F 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.

  • 82°F maximum daytime temperature in January in Portsmouth82
    82°F max day temperature
  • 7 hours of sunshine per day
  • 18 days with some rainfall in January in Portsmouth18
    18 days with some rainfall
  • 70°F minimum night-time temperature in January in Portsmouth70
    70°F 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
  • 5.7 inches monthly rainfall in January in Portsmouth5.7
    5.7 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in January in Portsmouth9
    9 (Very High) UV index
  • 81°F sea temperature in January in Portsmouth81
    81°F 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)  |  Imperial (°F)

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How hot is it in Portsmouth in January?

Daytime temperatures usually reach 82°F in Portsmouth in January with moderate heat and humidity, falling to 70°F 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 81°F.

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 5.7 inches.

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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