Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 79°F. 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 16th August 2025 GMT

More about Portsmouth

Portsmouth by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for New Hampshire

Rentalcars.com: Discount car hire worldwide

  • Compare car hire prices to find best deal online
  • Book flexible bookings with free cancellation policy
  • No hidden fees + price match guarantee
Go to Rentalcars.com deal >>

View all Rentalcars.com offers

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 16th August 2025

Expect clear skies in Portsmouth, New Hampshire with a maximum temperature of 79°F, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south-east.

  • 79°F maximum temperature79
    °F maximum temperature
  • 59°F minimum temperature59
    °F minimum temperature
  • Clear skies
    clear skies
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 79°F wind chill79
    °F wind chill
  • Gentle breeze of 9 mph from the South-East9
    mph wind from SE

Back to top

Portsmouth weather for Sunday 17th August 2025

Expect isolated thunderstorms in Portsmouth, New Hampshire with a maximum temperature of 84°F, moderate levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 26% chance of some rain and a gentle breeze of 9 mph from the south-west.

  • 84°F maximum temperature84
    °F maximum temperature
  • 64°F minimum temperature64
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 26% chance of some rain26
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Moderate heat & humidityM
    moderate heat & humidity
  • Gentle breeze of 9 mph from the South-West9
    mph wind from SW

Back to top

Portsmouth weather for Monday 18th August 2025

Expect sunshine and showers in Portsmouth, New Hampshire with a maximum temperature of 72°F, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 3% chance of some rain and a gentle breeze of 10 mph from the north.

  • 72°F maximum temperature72
    °F maximum temperature
  • 57°F minimum temperature57
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 7 (High)7
    UV index (High)
  • 3% chance of some rain3
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 72°F wind chill72
    °F wind chill
  • Gentle breeze of 10 mph from the North10
    mph wind from N

Back to top

Portsmouth weather for Tuesday 19th August 2025

Expect mostly cloudy with light rain in Portsmouth, New Hampshire with a maximum temperature of 68°F, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a light breeze of 7 mph from the south-east.

  • 68°F maximum temperature68
    °F maximum temperature
  • 57°F minimum temperature57
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 25% chance of some rain25
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 68°F wind chill68
    °F wind chill
  • Light breeze of 7 mph from the South-East7
    mph wind from SE

Back to top

Portsmouth weather for Wednesday 20th August 2025

Expect cloudy with some rain in Portsmouth, New Hampshire with a maximum temperature of 68°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 48% chance of some rain and a gentle breeze of 8 mph from the east.

  • 68°F maximum temperature68
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Cloudy with some rain
    cloudy with some rain
  • No hours of bright sunshine0
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 48% chance of some rain48
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 68°F wind chill68
    °F wind chill
  • Gentle breeze of 8 mph from the East8
    mph wind from E

Back to top

International Drivers Association: Get driving permit in 8 minutes

  • Order International Driving Permit (IDP) in 8 minutes online
  • Recognised in over 150 countries in Asia, Europe, Africa & more
  • Accepted by rental car agencies worldwide
Go to International Drivers Association deal >>

Metric (°C)  |  Imperial (°F)

Back to top

More about the USA

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^