The highest day temperature in July 2026 was 106°F. The lowest night temperature was 50°F. The average values for day and night temperatures during July were 89.5°F и 65.3°F respectivly.

The average sea surface temperature in July 2026 for Portsmouth was 67.5°F. The maximum and minimum values were 64.4°F and 72.4°F respectively.

Most of the days in July are sunny but you can also expect cloudy and gloomy days.

Precipitation total in July for Portsmouth is 1.5 in. It makes july the most rainy month of the year.

The average wind speed in July is 6.8 mph. It makes July one of the most windless months of the year for Portsmouth.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Portsmouth in July is 8.7 hours.