Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 28°C. Select a day from the live weather forecast for Portsmouth, New Hampshire, USA for more weather parameters.

5-day weather forecast updated at 04:03 on Saturday 26th July 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 Saturday 26th July 2025

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south.

  • 28°C maximum temperature28
    °C maximum temperature
  • 20°C minimum temperature20
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 13 kph from the South13
    kph wind from S

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Portsmouth weather for Sunday 27th July 2025

Expect mostly cloudy with light rain in Portsmouth, New Hampshire with a maximum temperature of 24°C, maximum UV of 7 (High) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 50% chance of some rain and a gentle breeze of 16 kph from the south.

  • 24°C maximum temperature24
    °C maximum temperature
  • 19°C minimum temperature19
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 50% chance of some rain50
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 16 kph from the South16
    kph wind from S

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Portsmouth weather for Monday 28th July 2025

Expect broken clouds in Portsmouth, New Hampshire with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south.

  • 31°C maximum temperature31
    °C maximum temperature
  • 19°C minimum temperature19
    °C minimum temperature
  • Broken clouds
    broken clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 10 kph from the South10
    kph wind from S

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Portsmouth weather for Tuesday 29th July 2025

Expect scattered clouds in Portsmouth, New Hampshire with a maximum temperature of 33°C, high levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-west.

  • 33°C maximum temperature33
    °C maximum temperature
  • 21°C minimum temperature21
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • High heat & humidityH
    high heat & humidity
  • Gentle breeze of 13 kph from the South-West13
    kph wind from SW

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Portsmouth weather for Wednesday 30th July 2025

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 10 hours of bright sunshine. There are 2-5 mm of rainfall expected with 53% chance of some rain and a light breeze of 9 kph from the north-west.

  • 29°C maximum temperature29
    °C maximum temperature
  • 20°C minimum temperature20
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 53% chance of some rain53
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Light breeze of 9 kph from the North-West9
    kph wind from NW

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