Portsmouth (NH) Weather and Climate: A Comprehensive Guide
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 maximum day and minimum night temperature
The climate in Portsmouth is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum 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 lows often dropping to around -8°C during the colder months. Check out our detailed temperature page for more information.Temperature ranges by month
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
The average number of days each month with precipitation
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. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Average humidity
The relative humidity is high throughout the year in Portsmouth.
The city experiences its highest humidity in September, reaching 76%. In April, the humidity drops to its lowest level at 62%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
partly cloudy and slight snow almost clear and no rain clear and no rainForecast for Portsmouth (NH)
3 m/s
3 m/s
2 m/s
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:
July has an average maximum temperature of 27°C and is the warmest month of the year.
The coldest month is February with an average maximum temperature of 1°C.
June tops the wettest month list with 139 mm of rainfall.
January is the driest month with 86 mm of precipitation.
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.
