Measurements:
°C
°F
CURRENT WEATHER
14:24
Portsmouth
96°F
N 5 mph
Feels like: 102°F
Precip: 1%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

08.05
wed
DAY
90°F
NE 4 mph
precip
4%
NIGHT
76°F
NE 7 mph
precip
10%
08.06
thu
DAY
90°F
NE 2 mph
precip
2%
NIGHT
78°F
NE 6 mph
precip
14%
08.07
fri
DAY
94°F
NW 1 mph
precip
3%
NIGHT
72°F
E 4 mph
precip
21%
08.08
sat
DAY
86°F
NW 1 mph
precip
6%
NIGHT
70°F
E 7 mph
precip
34%
08.09
sun
DAY
90°F
E 4 mph
precip
2%
NIGHT
74°F
E 6 mph
precip
7%
08.10
mon
DAY
90°F
E 8 mph
precip
2%
NIGHT
76°F
E 5 mph
precip
16%
08.11
tue
DAY
70°F
S 8 mph
precip
66%
NIGHT
64°F
N 4 mph
precip
25%

Portsmouth Sea Water Temperature in August, °F

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Portsmouth was 17.4°F. The maximum and minimum values were 15.4°F and 18.5°F respectively.

Portsmouth on the Weather Map

Best Time to Visit Portsmouth
The most sunny months:
November 16 days
October 14 days
July 13 days
The most warm months:
July 82.8 °F
August 80.0 °F
June 76.1 °F
Warmest sea temperature:
August 66.7 °F
July 65.2 °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
August 2 days
October 2 days
The most windy months:
January 9 mph
March 9 mph
November 9 mph
more details