Measurements:
°C
°F
CURRENT WEATHER
14:24
Portsmouth
62°F
SE 15 mph
Feels like: 60°F
Precip: 0%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

04.23
thu
DAY
58°F
SE 14 mph
precip
0%
NIGHT
38°F
SE 6 mph
precip
0%
04.24
fri
DAY
48°F
W 2 mph
precip
0%
NIGHT
36°F
SW 4 mph
precip
0%
04.25
sat
DAY
46°F
W 9 mph
precip
0%
NIGHT
38°F
NE 2 mph
precip
0%
04.26
sun
DAY
52°F
W 6 mph
precip
0%
NIGHT
42°F
S 2 mph
precip
0%
04.27
mon
DAY
56°F
NW 6 mph
precip
0%
NIGHT
42°F
N 4 mph
precip
0%
04.28
tue
DAY
58°F
N 10 mph
precip
0%
NIGHT
46°F
N 6 mph
precip
100%
04.29
wed
DAY
44°F
W 11 mph
precip
100%
NIGHT
48°F
NW 9 mph
precip
100%

Portsmouth Sea Water Temperature in April, °F

Select Year: 2026 2025 2024

The average sea surface temperature in April 2026 for Portsmouth was 5.4°F. The maximum and minimum values were 4.1°F and 7.3°F respectively.

Portsmouth on the Weather Map

Best Time to Visit Portsmouth
The most sunny months:
November 16 days
October 14 days
September 13 days
The most warm months:
July 81.7 °F
August 80.0 °F
June 75.2 °F
Warmest sea temperature:
August 66.7 °F
July 64.8 °F
September 63.6 °F
The most cold months:
January 30.9 °F
February 32.1 °F
December 36.4 °F
The most rainy months:
July 3 days
April 3 days
August 2 days
The most windy months:
January 9 mph
March 9 mph
November 9 mph
more details