The highest day temperature in April 2025 was 83°F. The lowest night temperature was 21°F. The average values for day and night temperatures during April were 54.2°F и 40.6°F respectivly.

The average sea surface temperature in April 2025 for Portsmouth was 40.4°F. The maximum and minimum values were 38.8°F and 44.4°F respectively.

Most of the days in April are gloomy but you can also expect sunny days.

Precipitation total in April for Portsmouth is 1.3 in. It makes april one of the most rainy months of the year.

The average wind speed in April is 8.9 mph.

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 April is 5.7 hours.