Current sea water temperature:
+66.2°F
| Minimum sea water temperature in June: | 66.2°F |
| Maximum sea water temperature in June: | 50.0°F |
| Average sea water temperature in June: | 57.7°F |
| more information | |
14 days
forecast
forecast
| Portsmouth |
monthly
weather
weather
| Portsmouth |
Sea water temperature for the last 10 days:
| June 29 | 66.2°F | June 24 | 61.2°F |
| June 28 | 65.5°F | June 23 | 60.6°F |
| June 27 | 64.8°F | June 22 | 61.5°F |
| June 26 | 60.4°F | June 21 | 59.2°F |
| June 25 | 61.5°F | June 20 | 60.4°F |
Monthly sea water temperature, °F
When is the warmest sea in Portsmouth?
Based on the data about daily sea water temperature for the last three years the warmest sea in Portsmouth was noticed in August, July and September.
Monthly Sea Temperatures in Portsmouth, °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.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 63.1°F. The highest and lowest sea temperatures during the month were 67.8°F and 60.6°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 61.1°F. The highest and lowest sea temperatures during the month were 63.3°F and 57.6°F.
current
weather
weather
| Portsmouth |
weather in
July
July
| Portsmouth |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 18:15
June 29, monday
2100
68°F
N
5 mph
5 mph
June 30, tuesday
0000
63°F
NE
6 mph
6 mph
0300
61°F
E
5 mph
5 mph
0600
61°F
NE
4 mph
4 mph
0900
73°F
NE
6 mph
6 mph
1200
82°F
N
6 mph
6 mph
1500
82°F
N
9 mph
9 mph
1800
81°F
N
7 mph
7 mph
