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Seasonal ranking

Warmest sea temperature in Japan in September

Where the sea is warmest across Japan during September, ranked by long-term monthly average water temperature. Nishihama Beach (Okinawa, Japan) tops the list at around 28°C. Open any spot for today's live water temperature and a 7-day swim forecast.

  1. 1
    Nishihama Beach
    Okinawa · Japan · Philippine Sea
    Warm — comfortable swimming
    28°C
    September average
  2. 2
    Sunayama Beach
    Okinawa · Japan · Philippine Sea
    Warm — comfortable swimming
    28°C
    September average
  3. 3
    Kondoi Beach
    Okinawa · Japan · East China Sea
    Warm — comfortable swimming
    28°C
    September average
  4. 4
    Kondoi Beach Taketomi
    Okinawa · Japan · East China Sea
    Warm — comfortable swimming
    28°C
    September average
  5. 5
    Emerald Beach Okinawa
    Okinawa · Japan · East China Sea
    Warm — comfortable swimming
    27°C
    September average
  6. 6
    Naminoue Beach
    Okinawa · Japan · East China Sea
    Warm — comfortable swimming
    27°C
    September average
  7. 7
    Manza Beach
    Okinawa · Japan · East China Sea
    Warm — comfortable swimming
    27°C
    September average
  8. 8
    Mibaru Beach
    Okinawa · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  9. 9
    Furuzamami Beach
    Okinawa · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  10. 10
    Shirahama Beach
    Wakayama · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  11. 11
    Katsurahama Beach
    Kochi · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  12. 12
    Nigishima Beach
    Mie · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  13. 13
    Ibusuki Beach
    Kagoshima · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  14. 14
    Aoshima Beach
    Miyazaki · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  15. 15
    Suma Beach
    Hyogo · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  16. 16
    Shirahama Beach Izu
    Shizuoka · Japan · Pacific Ocean
    Warm — comfortable swimming
    27°C
    September average
  17. 17
    Yuigahama Beach
    Kanagawa · Japan · Pacific Ocean
    Pleasant — swimmable without a wetsuit
    23°C
    September average
  18. 18
    Zushi Beach
    Kanagawa · Japan · Pacific Ocean
    Pleasant — swimmable without a wetsuit
    23°C
    September average
  19. 19
    Enoshima Beach
    Kanagawa · Japan · Pacific Ocean
    Pleasant — swimmable without a wetsuit
    23°C
    September average
  20. 20
    Kabira Bay
    Okinawa · Japan · Pacific Ocean
    Pleasant — swimmable without a wetsuit
    23°C
    September average
  21. 21
    Kujukuri Beach
    Chiba · Japan · Pacific Ocean
    Pleasant — swimmable without a wetsuit
    22°C
    September average
  22. 22
    Onjuku Beach
    Chiba · Japan · Pacific Ocean
    Pleasant — swimmable without a wetsuit
    22°C
    September average
  23. 23
    Onjuku Beach
    Chiba · Japan · Pacific Ocean
    Pleasant — swimmable without a wetsuit
    22°C
    September average

Warmest sea in September elsewhere

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Japan in September — frequently asked questions

Where is the sea warmest in Japan in September?
Nishihama Beach in Japan has the warmest sea in Japan in September, averaging about 28.0 °C. Sunayama Beach (28.0 °C) and Kondoi Beach follow close behind.
How many beaches in Japan are warm enough to swim in September?
23 of the top 23 ranked beaches in Japan average 22 °C or more in September, which most swimmers find comfortable without a wetsuit.
How are these September sea temperatures calculated?
Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.

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