Current sea water temperature:
+60.6°F
| Minimum sea water temperature in September: | 68.7°F |
| Maximum sea water temperature in September: | 56.5°F |
| Average sea water temperature in September: | 62.5°F |
| more information | |
14 days
forecast
forecast
| Portsmouth |
monthly
weather
weather
| Portsmouth |
Sea water temperature for the last 10 days:
| September 26 | 60.6°F | September 21 | 62.6°F |
| September 25 | 61.0°F | September 20 | 63.5°F |
| September 24 | 61.2°F | September 19 | 63.9°F |
| September 23 | 62.1°F | September 18 | 64.4°F |
| September 22 | 62.6°F | September 17 | 62.1°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 64.3°F. The highest and lowest sea temperatures during the month were 67.3°F and 60.6°F.
current
weather
weather
| Portsmouth |
weather in
October
October
| Portsmouth |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 21:24
September 27, sunday
0000
55°F
SW
30 mph
30 mph
0300
57°F
SW
32 mph
32 mph
0600
57°F
SW
32 mph
32 mph
0900
57°F
SW
34 mph
34 mph
1200
57°F
SW
32 mph
32 mph
1500
57°F
SW
29 mph
29 mph
1800
57°F
SW
27 mph
27 mph
2100
57°F
SW
24 mph
24 mph
