Portsmouth weather in March 2025

Expect 45°F daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Portsmouth in March. Check more long-term weather averages for Portsmouth in March before you book your next holiday to New Hampshire in 2025/2026.

  • 45°F maximum daytime temperature in March in Portsmouth45
    45°F max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in March in Portsmouth11
    11 days with some rainfall
  • 25°F minimum night-time temperature in March in Portsmouth25
    25°F min night temperature
  • 12 hours of daylight per day in March in Portsmouth12
    12 hours of daylight per day
  • No heat & humidity in March in Portsmouth0
    No heat & humidity
  • 3.4 inches monthly rainfall in March in Portsmouth3.4
    3.4 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in March in Portsmouth3
    3 (Moderate) UV index
  • 37°F sea temperature in March in Portsmouth37
    37°F sea temperature

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The March 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 March?

Daytime temperatures usually reach 45°F in Portsmouth in March, falling to 25°F at night.

How sunny is it in Portsmouth in March?

There are normally 7 hours of bright sunshine each day in Portsmouth in March - that's 56% of daylight hours.

How warm is the sea around Portsmouth in March?

The average sea temperature around Portsmouth in March is 37°F.

Does it rain in Portsmouth in March?

There are usually 11 days with some rain in Portsmouth in March and the average monthly rainfall is 3.4 inches. Rain may fall as snow in this month.

Portsmouth March sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st March 2025 06:18 17:33
Sunday, 16th March 2025 05:53 17:51
Monday, 31st March 2025 05:26 18:09

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