Average sea water temperature in January:
+41.6°F
| Minimum sea water temperature in January: | 45.9°F |
| Maximum sea water temperature in January: | 37.8°F |
Daily sea water temperature in January, °F
Show year:
2026
2025
2024
The average sea water temperature in January of 2026 was 40.9°F. The highest and lowest sea temperatures during the month were 42.3°F and 37.8°F.
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| Portsmouth |
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Monthly sea water temperature in Portsmouth, °F
Which USA resorts have warmest sea in January?
| Place name | January 2026 | January 2025 |
|---|---|---|
| Kailua Kona | 78.3°F | 78.2°F |
| Honolulu | 77.2°F | 77.6°F |
| Hawaii | 77.2°F | 77.5°F |
| Maui | 77.0°F | 76.9°F |
| Kauai | 77.0°F | 75.0°F |
| West Palm Beach | 76.6°F | 75.5°F |
| Oahu | 76.1°F | 76.5°F |
| Fort Lauderdale | 75.9°F | 75.1°F |
| Miami Beach | 74.0°F | 73.1°F |
| Key West | 72.5°F | 70.3°F |
| Miami | 71.2°F | 70.7°F |
| South Padre Island | 69.5°F | 66.7°F |
| Naples | 67.7°F | 64.7°F |
| Siesta Key | 65.0°F | 61.5°F |
| Sarasota | 65.0°F | 61.2°F |
| Orlando | 64.8°F | 59.8°F |
| Tampa | 64.3°F | 60.4°F |
| Daytona Beach | 64.1°F | 59.7°F |
| Corpus Christi | 63.9°F | 61.6°F |
| St. Petersburg | 63.5°F | 59.6°F |
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 17:14
July 22, wednesday
1800
81°F
E
11 mph
11 mph
2100
68°F
E
12 mph
12 mph
July 23, thursday
0000
64°F
SE
9 mph
9 mph
0300
57°F
E
6 mph
6 mph
0600
55°F
SE
7 mph
7 mph
0900
66°F
S
6 mph
6 mph
1200
73°F
SW
1 mph
1 mph
1500
75°F
NW
4 mph
4 mph
