Measurements:
°C
°F
CURRENT WEATHER
17:36
Portsmouth
86°F
E 7 mph
Feels like: 84°F
Precip: 1%
World Resorts USA Portsmouth Weather

7 Day Weather Forecast

08.25
tue
DAY
82°F
E 9 mph
precip
3%
NIGHT
68°F
E 7 mph
precip
6%
08.26
wed
DAY
76°F
SW 1 mph
precip
3%
NIGHT
70°F
SE 2 mph
precip
13%
08.27
thu
DAY
78°F
NW 9 mph
precip
9%
NIGHT
70°F
N 9 mph
precip
20%
08.28
fri
DAY
76°F
NW 7 mph
precip
19%
NIGHT
68°F
SE 7 mph
precip
31%
08.29
sat
DAY
74°F
NW 2 mph
precip
2%
NIGHT
60°F
NE 4 mph
precip
14%
08.30
sun
DAY
76°F
N 6 mph
precip
10%
NIGHT
66°F
NE 9 mph
precip
37%
08.31
mon
DAY
74°F
W 7 mph
precip
11%
NIGHT
64°F
SW 4 mph
precip
24%

Portsmouth Sea Water Temperature in August, °F

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Portsmouth was 19.5°F. The maximum and minimum values were 18.0°F and 22.3°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 67.0 °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