Average sea water temperature in September:
+62.5°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:
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.
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Monthly sea water temperature in Portsmouth, °F
Which USA resorts have warmest sea in September?
| Place name | September 2026 | September 2025 |
|---|---|---|
| Key West | 88.0°F | 86.9°F |
| Key Largo | 87.4°F | 86.6°F |
| Naples | 87.4°F | 86.1°F |
| Siesta Key | 87.3°F | 84.9°F |
| Sarasota | 87.2°F | 84.8°F |
| Houston | 87.2°F | 84.9°F |
| Corpus Christi | 87.0°F | 85.8°F |
| Cape Coral | 86.9°F | 85.2°F |
| West Palm Beach | 86.7°F | 86.2°F |
| Fort Lauderdale | 86.6°F | 86.4°F |
| New Orleans | 86.6°F | 84.3°F |
| Tampa | 86.5°F | 84.3°F |
| Clearwater Beach | 86.5°F | 84.0°F |
| Orange Beach | 86.2°F | 84.0°F |
| Pensacola Beach | 86.2°F | 83.9°F |
| Panama City Beach | 86.1°F | 83.4°F |
| Pensacola | 86.0°F | 83.9°F |
| Fort Walton Beach | 86.0°F | 83.3°F |
| Destin | 86.0°F | 83.1°F |
| Miami Beach | 85.9°F | 86.1°F |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 21:53
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
