
Surf Forecasts:
Keta Reef Oshima surf forecast from 3 Aug 2026:
- Best quality surf: Thursday 6 Aug, 6PM (local time) - 11ft (3.5m), 15s period, S swell with offshore winds.
- Most powerful swell: Wednesday 5 Aug, 12AM (local time) - 11ft (3.5m), 16s period, SE swell with 6,706 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 3PM (local time) - 11ft (3.5m), 15s period with S swell.
Best Forecast Surf Conditions for Keta Reef Oshima this week:
The surf forecast for Keta Reef Oshima over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 06) at 3PM. The primary swell is predicted to be 3.5m and 15s period with a secondary swell of 1.0m and 10s. Another secondary swell of 1.7m and 10s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Keta Reef Oshima in the next 16 days are 3.5m 16s and forecast to arrive on Wednesday (Aug 05) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 5s period and expected on Tuesday (Aug 04) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Thu 6th Aug) | 11ft (3.5m) 15s |
| Best Surf | 6PM (Thu 6th Aug) | 11ft (3.5m) 15s |
| Most Powerful | 12AM (Wed 5th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Keta Reef Oshima over the next 16 days.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Warm (max 27°C on Wed afternoon, min 23°C on Mon night). Winds decreasing (strong winds from the NNE on Wed morning, moderate winds from the NE by Thu morning). | Days 5-7 Weather SummaryHeavy rain (total 46mm), heaviest during Fri night. Warm (max 27°C on Thu night, min 25°C on Sat night). Mainly fresh winds. | ||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | ESE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SE 15 | SSE 15 | S 14 | S 15 | S 15 | SSW 15 | SSW 15 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SW 16 | SW 16 | SW 16 |
Wave Graph | |||||||||||||||||||
4429 | 4126 | 5220 | 6706 | 5771 | 5896 | 3465 | 3570 | 5171 | 4054 | 3385 | 3072 | 2200 | 2529 | 2581 | 2646 | 2917 | 3053 | 2107 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | off | off | off | off | off | cross-off |
High Tide | 7:46AM1.33m | 8:07PM1.44m | 8:48AM1.22m | 8:32PM1.43m | 10:15AM1.13m | 9:02PM1.41m | 12:52PM1.11m | 9:45PM1.39m | 3:31PM1.23m | 11:04PM1.36m | 4:09PM1.34m | 00:55AM1.38m | |||||||
Low Tide | 1:54AM0.58m | 1:50PM0.57m | 2:41AM0.52m | 2:19PM0.75m | 3:40AM0.47m | 2:50PM0.92m | 4:56AM0.43m | 3:24PM1.09m | 6:27AM0.35m | 5:44PM1.22m | 7:48AM0.24m | 8:24PM1.20m | |||||||
— | 4:54 | — | — | 4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — | |
6:44 | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | |
mm | — | — | — | — | — | — | 2 | — | — | 11 | 9 | 4 | 17 | 2 | — | 2 | 1 | — | — |
Temp °C | 24 | 25 | 26 | 24 | 24 | 27 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 26 | 26 |
Feels °C | 19 | 20 | 23 | 20 | 19 | 26 | 26 | 28 | 29 | 28 | 27 | 27 | 26 | 28 | 28 | 27 | 27 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | ESE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SE 15 | SSE 15 | S 14 | S 15 | S 15 | SSW 15 | SSW 15 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SW 16 | SW 16 | SW 16 |
4429 | 4126 | 5220 | 6706 | 5771 | 5896 | 3465 | 3570 | 5171 | 4054 | 3385 | 3072 | 2200 | 2529 | 2581 | 2646 | 2917 | 3053 | 2107 | |
Swell 2 Height (m) Direction Period (s) | E 14 | E 14 | E 13 | ENE 13 | ENE 13 | — | ESE 10 | ESE 10 | E 10 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 12 | ESE 13 | ESE 13 | E 13 |
34 | 59 | 31 | 57 | 32 | — | 312 | 260 | 208 | 425 | 572 | 578 | 646 | 508 | 459 | 813 | 841 | 989 | 905 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | E 16 | — | — | E 15 | E 15 | E 15 | ENE 14 | ENE 14 | E 14 | — | — | SSE 9 |
— | — | — | — | — | — | — | 5 | — | — | 17 | 17 | 17 | 39 | 40 | 206 | — | — | 56 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | NE 5 | ENE 8 | ENE 7 | NE 5 | — | NE 4 | NE 4 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | — | — | — | — | — |
325 | 123 | 492 | 449 | 115 | — | 24 | 28 | 551 | 636 | 782 | 838 | 830 | 737 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 454 | 457 | 53 | 457 | 454 | 53 | 47 | 47 | 0 | 38 | 38 | 38 | 38 | 0 | 0 | 0 | 55 | 38 | 1073 |
Best forecast wave conditions in Izu Islands | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
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Information about the Keta Reef Oshima Surf forecast
The above surf forecast table for Keta Reef Oshima provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Keta Reef Oshima can be found by selecting the local surf guide option on the grey menu. Our Keta Reef Oshima surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Keta Reef Oshima) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Keta Reef Oshima may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Keta Reef Oshima is 1 km (1 miles) from the city of Oshima. If you plan a holiday in Izu Islands, look for hotels and other accommodation in Oshima. Oshima has rooms for a wide range of budgets as well as car hire and transport links.











