Current sea water temperature:
+36.9°F
| Minimum sea water temperature in February: | 41.9°F |
| Maximum sea water temperature in February: | 34.3°F |
| Average sea water temperature in February: | 38.8°F |
| more information | |
14 days
forecast
forecast
| Portsmouth |
monthly
weather
weather
| Portsmouth |
Sea water temperature for the last 10 days:
| February 26 | 36.9°F | February 21 | 36.9°F |
| February 25 | 36.0°F | February 20 | 36.7°F |
| February 24 | 37.6°F | February 19 | 35.4°F |
| February 23 | 37.4°F | February 18 | 36.1°F |
| February 22 | 37.4°F | February 17 | 35.2°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
March
March
| Portsmouth |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 18:08
February 26, thursday
2100
27°F
SE
6 mph
6 mph
February 27, friday
0000
25°F
SE
7 mph
7 mph
0300
25°F
SE
4 mph
4 mph
0600
19°F
S
2 mph
2 mph
0900
25°F
E
2 mph
2 mph
1200
36°F
N
5 mph
5 mph
1500
41°F
NE
6 mph
6 mph
1800
39°F
N
8 mph
8 mph
