21.07
tue
tue
Day
84°F
NW 12 mph
Precip.
1%
1%
Night
66°F
N 10 mph
Precip.
68%
68%
22.07
wed
wed
Day
79°F
NE 9 mph
Precip.
34%
34%
Night
64°F
E 6 mph
Precip.
12%
12%
23.07
thu
thu
Day
72°F
E 13 mph
Precip.
1%
1%
Night
57°F
E 4 mph
Precip.
6%
6%
24.07
fri
fri
Day
75°F
N 5 mph
Precip.
2%
2%
Night
59°F
NE 4 mph
Precip.
13%
13%
25.07
sat
sat
Day
73°F
NW 9 mph
Precip.
2%
2%
Night
63°F
NE 4 mph
Precip.
11%
11%
26.07
sun
sun
Day
77°F
N 9 mph
Precip.
2%
2%
Night
66°F
N 8 mph
Precip.
6%
6%
27.07
mon
mon
Day
82°F
NE 9 mph
Precip.
5%
5%
Night
68°F
NE 7 mph
Precip.
59%
59%
sea water
temperature
temperature
| Portsmouth |
monthly
weather
weather
| Portsmouth |
current
weather
weather
| Portsmouth |
14 days
forecast
forecast
| Portsmouth |
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 65.8°F. The highest and lowest sea temperatures during the month were 70.2°F and 63.0°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 63.3°F. The highest and lowest sea temperatures during the month were 65.3°F and 59.7°F.
Air temperature in Portsmouth, °F
Precipitation total in Portsmouth, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 09:44
July 21, tuesday
1200
84°F
NW
12 mph
12 mph
1500
84°F
NW
13 mph
13 mph
1800
79°F
NW
12 mph
12 mph
2100
64°F
NW
9 mph
9 mph
July 22, wednesday
0000
66°F
N
10 mph
10 mph
0300
68°F
NE
9 mph
9 mph
0600
66°F
NE
9 mph
9 mph
0900
70°F
NE
9 mph
9 mph
