Average sea water temperature in December:
+45.9°F
| Minimum sea water temperature in December: | 50.7°F |
| Maximum sea water temperature in December: | 41.9°F |
Daily sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 46.2°F. The highest and lowest sea temperatures during the month were 47.8°F and 44.1°F.
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Monthly sea water temperature in Portsmouth, °F
Which USA resorts have warmest sea in December?
| Place name | December 2025 | December 2024 |
|---|---|---|
| Kailua Kona | 79.4°F | 78.3°F |
| Fort Lauderdale | 79.2°F | 77.6°F |
| Honolulu | 78.8°F | 78.3°F |
| Hawaii | 78.7°F | 78.3°F |
| Kauai | 78.7°F | 76.0°F |
| Maui | 78.2°F | 77.8°F |
| Miami Beach | 78.0°F | 75.9°F |
| Islamorada | 77.6°F | 73.4°F |
| Key Largo | 77.5°F | 73.1°F |
| Oahu | 77.5°F | 77.2°F |
| Key West | 77.0°F | 72.6°F |
| Miami | 76.4°F | 73.0°F |
| Everglades | 75.1°F | 69.7°F |
| South Padre Island | 72.3°F | 71.9°F |
| Naples | 72.2°F | 67.7°F |
| Cape Coral | 72.2°F | 67.8°F |
| Sanibel Island | 71.7°F | 67.1°F |
| Siesta Key | 70.2°F | 65.6°F |
| Sarasota | 70.1°F | 65.6°F |
| Cocoa Beach | 70.0°F | 66.6°F |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 15:34
December 16, tuesday
1800
32°F
NE
6 mph
6 mph
2100
28°F
NE
9 mph
9 mph
December 17, wednesday
0000
27°F
NE
11 mph
11 mph
0300
27°F
NE
13 mph
13 mph
0600
27°F
NE
14 mph
14 mph
0900
30°F
NE
16 mph
16 mph
1200
36°F
NE
17 mph
17 mph
1500
37°F
NE
15 mph
15 mph
