The Japan resorts with the warmest sea water temperature in January are Okinawa, Kamakura and Atami.
Below you can see a list of all popular Japan resorts and information about sea water temperature in January for the last two years.
| Resort Name | January 2025 | January 2024 | January 2023 |
|---|---|---|---|
| Okinawa | 74.0°F | 75.3°F | 74.3°F |
| Kamakura | 62.3°F | 63.4°F | 61.7°F |
| Atami | 62.3°F | 63.4°F | 62.0°F |
| Hakone | 62.2°F | 63.3°F | 61.9°F |
| Nagasaki | 61.5°F | 61.7°F | 63.0°F |
| Fukuoka | 57.6°F | 58.7°F | 57.3°F |
| Hiroshima | 56.8°F | 57.8°F | 56.6°F |
| Yokohama | 56.5°F | 55.9°F | 56.1°F |
| Nagoya | 54.2°F | 56.4°F | 55.7°F |
| Tokyo | 53.2°F | 54.4°F | 53.4°F |
| Kobe | 52.8°F | 54.2°F | 53.0°F |
| Nara | 51.3°F | 53.9°F | 51.9°F |
| Osaka | 51.2°F | 54.1°F | 51.8°F |
| Kyoto | 50.7°F | 53.3°F | 51.9°F |
| Noboribetsu | 42.6°F | 41.4°F | 41.3°F |
| Sapporo | 40.7°F | 42.6°F | 28.1°F |
Please see following sea water temperature averages charts for the warmest Japan resorts in January.
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0
15
30
45
60
75
90
105
77.3
80.7
84.2
87.4
88.3
87.3
83.1
78.6
74.9
73
72.8
74.3
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0
14
28
42
56
70
84
98
112
65.2
70.7
75.7
81.4
83.7
79.4
72.8
67.3
62
59.9
59.7
61.3
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0
14
28
42
56
70
84
98
112
66.1
71.8
76.7
81.8
83.7
79.3
72.9
67.4
62.5
60.9
60.4
62
You can also get the same information for the every other month of the year when the average sea water temperature is greater then 70°F.
