Current sea water temperature:
+53.2°F
| Minimum sea water temperature in October: | 63.1°F |
| Maximum sea water temperature in October: | 52.9°F |
| Average sea water temperature in October: | 57.2°F |
| more information | |
14 days
forecast
forecast
| Portsmouth |
monthly
weather
weather
| Portsmouth |
Sea water temperature for the last 10 days:
| October 28 | 53.2°F | October 23 | 53.6°F |
| October 27 | 53.1°F | October 22 | 54.9°F |
| October 26 | 53.2°F | October 21 | 54.7°F |
| October 25 | 53.4°F | October 20 | 54.5°F |
| October 24 | 53.8°F | October 19 | 54.5°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:
2026
2025
2024
The average sea water temperature in August of 2026 was 67.2°F. The highest and lowest sea temperatures during the month were 72.1°F and 64.4°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:
2026
2025
2024
The average sea water temperature in September of 2026 was 63.8°F. The highest and lowest sea temperatures during the month were 67.3°F and 59.5°F.
current
weather
weather
| Portsmouth |
weather in
November
November
| Portsmouth |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 14:25
October 29, thursday
1500
64°F
NE
11 mph
11 mph
1800
61°F
NE
11 mph
11 mph
2100
57°F
NE
12 mph
12 mph
October 30, friday
0000
55°F
NE
12 mph
12 mph
0300
55°F
NE
11 mph
11 mph
0600
55°F
NE
9 mph
9 mph
0900
57°F
E
9 mph
9 mph
1200
64°F
E
15 mph
15 mph
