Portsmouth weather live forecast

Tomorrow's maximum temperature in Portsmouth is expected to be 16°C.

5-day weather forecast updated at 04:03 on Thursday 1st May 2025 GMT

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The 5-day weather forecast for New Hampshire (Portsmouth) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Portsmouth weather forecast by day

Below are the detailed weather forecasts for Portsmouth for the next 5 days.

Portsmouth weather for Thursday 1st May 2025

Expect sunshine and showers in Portsmouth, New Hampshire with a maximum temperature of 16°C, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 16 kph from the south-east.

  • 16°C maximum temperature16
    °C maximum temperature
  • 8°C minimum temperature8
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 25% chance of some rain25
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 16°C wind chill16
    °C wind chill
  • Gentle breeze of 16 kph from the South-East16
    kph wind from SE

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Portsmouth weather for Friday 2nd May 2025

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 50% chance of some rain and a light breeze of 12 kph from the south.

  • 21°C maximum temperature21
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 50% chance of some rain50
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 21°C wind chill21
    °C wind chill
  • Light breeze of 12 kph from the South12
    kph wind from S

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Portsmouth weather for Saturday 3rd May 2025

Expect mostly cloudy with light rain in Portsmouth, New Hampshire with a maximum temperature of 25°C, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 80% chance of some rain and a gentle breeze of 16 kph from the south.

  • 25°C maximum temperature25
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 80% chance of some rain80
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 25°C wind chill25
    °C wind chill
  • Gentle breeze of 16 kph from the South16
    kph wind from S

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Portsmouth weather for Sunday 4th May 2025

Expect mostly cloudy with light rain in Portsmouth, New Hampshire with a maximum temperature of 20°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 56% chance of some rain and a gentle breeze of 14 kph from the north-east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 56% chance of some rain56
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 20°C wind chill20
    °C wind chill
  • Gentle breeze of 14 kph from the North-East14
    kph wind from NE

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Portsmouth weather for Monday 5th May 2025

Expect sunshine and showers in Portsmouth, New Hampshire with a maximum temperature of 12°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 10-20 mm of rainfall expected with 25% chance of some rain and a moderate breeze of 20 kph from the north-east.

  • 12°C maximum temperature12
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 25% chance of some rain25
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Moderate breeze of 20 kph from the North-East20
    kph wind from NE

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Metric (°C / mm)  |  Imperial (°F / inches)

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