Current sea water temperature:
+69.4°F
| Minimum sea water temperature in August: | 71.1°F |
| Maximum sea water temperature in August: | 59.7°F |
| Average sea water temperature in August: | 65.1°F |
| more information | |
14 days
forecast
forecast
| Portsmouth |
monthly
weather
weather
| Portsmouth |
Sea water temperature for the last 10 days:
| August 12 | 69.4°F | August 7 | 64.4°F |
| August 11 | 68.4°F | August 6 | 64.8°F |
| August 10 | 67.8°F | August 5 | 64.8°F |
| August 9 | 65.7°F | August 4 | 66.4°F |
| August 8 | 65.1°F | August 3 | 66.7°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 65.7°F. The highest and lowest sea temperatures during the month were 70.2°F and 63.0°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
August
August
| Portsmouth |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 15:46
August 12, wednesday
1800
86°F
NE
4 mph
4 mph
2100
75°F
NE
6 mph
6 mph
August 13, thursday
0000
70°F
NE
5 mph
5 mph
0300
66°F
E
6 mph
6 mph
0600
63°F
NE
8 mph
8 mph
0900
70°F
NE
9 mph
9 mph
1200
79°F
E
5 mph
5 mph
1500
75°F
E
2 mph
2 mph
