Portsmouth Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from pleasant to chilly in Portsmouth. On average, daytime temperatures range from a pleasant 21°C (70°F) in July to a chilly 9°C (48°F) in February.

Nighttime temperatures range from 15°C (59°F) in July to 4°C (39°F) in February.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Portsmouth has a moderate amount of precipitation, averaging 844 mm (33 in) of rainfall annually. The amount of precipitation varies moderately throughout the year. The wettest month, November, sees around 94 mm (3.7 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, March, still receives a respectable 54 mm (2.1 in) of rainfall. For more details, please visit our Portsmouth Precipitation page.

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

The average number of days each month with precipitation

In Portsmouth, summer days are longer and more sunny, with daily sunshine hours peaking at 7.4 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 1.8 hours per average day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The city experiences its highest humidity in January, reaching 91%. In April, the humidity drops to its lowest level at 73%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year