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Portsmouth (NH) Climate by Month

Portsmouth experiences great temperature shifts. The city's weather can transition from warm days to very cold weather. It is also known for its large amounts of rain/snowfall. Now, let’s break down all the climate details for a clearer picture.

Average day and night temperature

The climate in Portsmouth is known for significant temperature differences throughout the year, making the weather dynamic. Typically, daytime temperatures range from a comfortable 27°C in July to a very cold 1°C in the coolest month, February. Nights are cooler, with temperatures generally dropping to -8°C, particularly during the colder months.

The mean minimum and maximum temperatures throughout the year

Precipitation and rainy days

Portsmouth has a notably wet climate with abundant precipitation, recording 1315 mm of rain/snowfall per year. Precipitation levels in Portsmouth remain relatively steady throughout the year. June has the most rain, with 139 mm over 14 days. In January, this drops slightly to 86 mm, making the city's climate fairly predictable.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

For those who appreciate different seasons, Portsmouth serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 9.8 hours of sunshine daily, and embrace the darker days in November, offering only 4.2 hours of daily sunlight.

Monthly hours of sunshine

Data from: Concord, the United States of America (64 KM, 40 Miles).

Daily hours of sunshine

Data from: Concord, the United States of America (64 KM, 40 Miles).

The best time of year to visit Portsmouth in the United States of America

During the months of June and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • Which is the warmest month in Portsmouth?
    July has an average maximum temperature of 27°C and is the warmest month of the year.
  • Which is the coldest month in Portsmouth?
    The coldest month is February with an average maximum temperature of 1°C.
  • Which is the wettest month in Portsmouth?
    June tops the wettest month list with 139 mm of rainfall.
  • Which is the driest month in Portsmouth?
    January is the driest month with 86 mm of precipitation.
  • Which is the sunniest month in Portsmouth?
    July is the sunniest month with an average of 295 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

    Forecast for Portsmouth (NH)

    Fri   Nov 22
    12°C | 6°C
    SE 22 km/h
    20 mm
    broken clouds and rain

    broken clouds and rain

    Sat   Nov 23
    8°C | 4°C
    NW 22 km/h
    20 mm
    overcast and rain

    overcast and rain

    Sun   Nov 24
    10°C | 3°C
    W 29 km/h
    almost clear and no rain

    almost clear and no rain