Average sea water temperature in September:
+62.4°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 63.8°F. The highest and lowest sea temperatures during the month were 67.3°F and 59.5°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 | 87.8°F | 86.9°F |
| Key Largo | 87.2°F | 86.6°F |
| Naples | 87.0°F | 86.1°F |
| Galveston | 87.0°F | 85.5°F |
| Siesta Key | 86.9°F | 84.9°F |
| Houston | 86.9°F | 84.9°F |
| Corpus Christi | 86.8°F | 85.8°F |
| Sarasota | 86.8°F | 84.8°F |
| West Palm Beach | 86.6°F | 86.2°F |
| Fort Lauderdale | 86.6°F | 86.4°F |
| New Orleans | 86.4°F | 84.3°F |
| Cape Coral | 86.3°F | 85.2°F |
| Gulf Shores | 86.1°F | 84.3°F |
| Orange Beach | 86.0°F | 84.0°F |
| Pensacola Beach | 85.9°F | 83.9°F |
| Tampa | 85.9°F | 84.3°F |
| Clearwater Beach | 85.9°F | 84.0°F |
| Miami Beach | 85.8°F | 86.1°F |
| Panama City Beach | 85.8°F | 83.4°F |
| Fort Walton Beach | 85.7°F | 83.3°F |
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
