Average sea water temperature in September:
+62.2°F
| Minimum sea water temperature in September: | 68.7°F |
| Maximum sea water temperature in September: | 56.5°F |
Daily 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.
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Monthly sea water temperature in Portsmouth, °F
Which USA resorts have warmest sea in September?
| Place name | September 2025 | September 2024 |
|---|---|---|
| Key West | 86.9°F | 87.4°F |
| Fort Lauderdale | 86.4°F | 86.4°F |
| Miami Beach | 86.1°F | 86.3°F |
| Naples | 86.1°F | 87.2°F |
| Corpus Christi | 85.8°F | 84.7°F |
| Miami | 85.8°F | 86.0°F |
| Houston | 84.9°F | 83.4°F |
| Siesta Key | 84.9°F | 86.8°F |
| Sarasota | 84.8°F | 86.7°F |
| Cocoa Beach | 84.6°F | 85.2°F |
| Tampa | 84.3°F | 86.0°F |
| New Orleans | 84.3°F | 82.9°F |
| St. Petersburg | 84.1°F | 86.1°F |
| Clearwater Beach | 84.0°F | 86.2°F |
| Panama City Beach | 83.4°F | 84.8°F |
| Destin | 83.1°F | 84.5°F |
| Orlando | 82.8°F | 83.6°F |
| Daytona Beach | 82.7°F | 83.2°F |
| Kauai | 81.5°F | 79.4°F |
| Jacksonville | 81.1°F | 82.0°F |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 19:17
June 29, monday
2100
68°F
N
5 mph
5 mph
June 30, tuesday
0000
63°F
NE
6 mph
6 mph
0300
61°F
E
5 mph
5 mph
0600
61°F
NE
4 mph
4 mph
0900
73°F
NE
6 mph
6 mph
1200
82°F
N
6 mph
6 mph
1500
82°F
N
9 mph
9 mph
1800
81°F
N
7 mph
7 mph
