Portsmouth weather live forecast

Tomorrow's maximum temperature in Portsmouth is expected to be 20°C.

5-day weather forecast updated at 04:03 on Monday 16th June 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 Monday 16th June 2025

Expect broken clouds in Portsmouth, New Hampshire with a maximum temperature of 20°C, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south-east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 13°C minimum temperature13
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 15 kph from the South-East15
    kph wind from SE

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Portsmouth weather for Tuesday 17th June 2025

Expect mostly cloudy with light rain in Portsmouth, New Hampshire with a maximum temperature of 20°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 58% chance of some rain and a gentle breeze of 14 kph from the south-east.

  • 20°C maximum temperature20
    °C maximum temperature
  • 14°C minimum temperature14
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 3 hours of bright sunshine3
    hours of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 58% chance of some rain58
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 14 kph from the South-East14
    kph wind from SE

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Portsmouth weather for Wednesday 18th June 2025

Expect sunshine and showers in Portsmouth, New Hampshire with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 68% chance of some rain and a light breeze of 12 kph from the south.

  • 27°C maximum temperature27
    °C maximum temperature
  • 17°C minimum temperature17
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 68% chance of some rain68
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 12 kph from the South12
    kph wind from S

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Portsmouth weather for Thursday 19th June 2025

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0-2 mm of rainfall expected with 50% chance of some rain and a gentle breeze of 18 kph from the south-west.

  • 31°C maximum temperature31
    °C maximum temperature
  • 20°C minimum temperature20
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 12 hours of bright sunshine12
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 50% chance of some rain50
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 18 kph from the South-West18
    kph wind from SW

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Portsmouth weather for Friday 20th June 2025

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 25°C, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and a gentle breeze of 17 kph from the west.

  • 25°C maximum temperature25
    °C maximum temperature
  • 16°C minimum temperature16
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 44% chance of some rain44
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 17 kph from the West17
    kph wind from W

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

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