Current sea water temperature:
+58.6°F
| Minimum sea water temperature in June: | 64.6°F |
| Maximum sea water temperature in June: | 50.0°F |
| Average sea water temperature in June: | 57.2°F |
| more information | |
14 days
forecast
forecast
| Portsmouth |
monthly
weather
weather
| Portsmouth |
Sea water temperature for the last 10 days:
| June 8 | 58.6°F | June 3 | 53.4°F |
| June 7 | 56.8°F | June 1 | 51.6°F |
| June 6 | 56.1°F | May 31 | 51.8°F |
| June 5 | 56.5°F | May 30 | 54.3°F |
| June 4 | 55.4°F | May 29 | 53.6°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
June
June
| Portsmouth |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 16:19
June 08, monday
1800
72°F
N
6 mph
6 mph
2100
61°F
NE
7 mph
7 mph
June 09, tuesday
0000
57°F
E
7 mph
7 mph
0300
57°F
E
7 mph
7 mph
0600
59°F
E
6 mph
6 mph
0900
72°F
E
6 mph
6 mph
1200
79°F
E
6 mph
6 mph
1500
82°F
E
6 mph
6 mph
