Surf Forecasts:
Keta Reef Oshima surf forecast from 18 Jun 2026:
- Best quality surf: Friday 19 Jun, 6AM (local time) - 2.5ft (0.8m), 7s period, SSE swell with cross-offshore winds.
- Most powerful swell: Sunday 21 Jun, 3PM (local time) - 7.5ft (2.3m), 8s period, SW swell with 719 kJ wave energy.
- Next surfable swell (1★+): Friday 19 Jun, 6AM (local time) - 2.5ft (0.8m), 7s period with SSE 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 Friday (Jun 19) at 6AM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.8m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Keta Reef Oshima in the next 16 days are 2.3m 8s and forecast to arrive on Sunday (Jun 21) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Wednesday (Jun 24) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Fri 19th Jun) | 2.5ft (0.8m) 7s |
| Best Surf | 6AM (Fri 19th Jun) | 2.5ft (0.8m) 7s |
| Most Powerful | 3PM (Sun 21st Jun) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for Keta Reef Oshima over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 32mm), heaviest during Sun morning. Warm (max 24°C on Sun morning, min 21°C on Sat afternoon). Winds increasing (calm on Sat afternoon, strong winds from the SW by Sun morning). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 25°C on Sun afternoon, min 20°C on Mon afternoon). Winds decreasing (strong winds from the SW on Sun afternoon, calm by Mon night). | ||||||||||||||||||||
Thu 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 7 | SW 8 | SW 8 | SW 8 | SW 7 | SW 7 | SSW 7 | S 5 | SSW 7 | SW 8 | SW 8 | ENE 10 | ENE 10 | E 10 | E 9 | E 9 | SE 11 | SE 11 | ENE 8 | SE 11 | SE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 68 | 419 | 41 | 20 | 25 | 26 | 32 | 93 | 294 | 719 | 158 | 83 | 170 | 158 | 108 | 79 | 40 | 41 | 181 | 40 | 37 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | cross-off | off | cross-off | off | glassy | cross | cross-on | cross-on | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | glassy | cross-off | off | cross-off | off |
High Tide | 8:17PM1.36m | 6:32AM1.41m | 8:55PM1.31m | 7:26AM1.30m | 9:30PM1.28m | 8:30AM1.18m | 10:02PM1.25m | 9:54AM1.07m | 10:35PM1.25m | 11:46AM1.01m | 11:10PM1.26m | 1:38PM1.04m | 11:51PM1.28m | ||||||||
Low Tide | 1:17AM0.92m | 1:48PM0.08m | 2:09AM0.87m | 2:32PM0.24m | 3:08AM0.81m | 3:15PM0.43m | 4:17AM0.72m | 3:58PM0.61m | 5:34AM0.62m | 4:47PM0.77m | 6:44AM0.50m | 5:49PM0.90m | 7:41AM0.38m | ||||||||
 |  |  | |  |  |  |  |  | |  |  | |  |  | | | | | | | |
 | — | — | 4:28 | — | — | 4:28 | — | — | 4:28 | — | — | 4:28 | — | — | 4:28 | — | — | 4:30 | — | — | 4:30 |
 | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | 6:59 |
mm | — | — | — | — | 1 | 3 | 6 | 12 | 10 | — | — | — | 1 | 1 | 1 | — | — | — | — | — | — |
Temp °C | 23 | 23 | 22 | 22 | 23 | 22 | 21 | 23 | 24 | 25 | 24 | 21 | 20 | 21 | 21 | 22 | 22 | 21 | 21 | 20 | 20 |
Feels °C | 25 | 24 | 23 | 23 | 25 | 23 | 25 | 19 | 21 | 21 | 24 | 19 | 20 | 23 | 22 | 23 | 24 | 18 | 19 | 18 | 20 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SSW 8 | SSE 6 | SSE 6 | SW 7 | SW 7 | ESE 4 | SE 9 | SE 9 | SSW 8 | SW 8 | SW 8 | ENE 10 | E 10 | E 9 | E 9 | ENE 8 | E 8 | E 8 | E 8 | ENE 8 |
| kJ | 68 | 221 | 41 | 19 | 25 | 26 | 12 | 14 | 13 | 307 | 158 | 66 | 170 | 158 | 108 | 79 | 24 | 33 | 66 | 33 | 19 |
Swell 2 Height (m) Direction Period (s) | SSE 6 | SE 8 | SW 8 | SW 8 | SE 10 | SE 10 | SE 10 | ENE 9 | E 6 | SE 9 | SE 10 | ENE 10 | SW 8 | SW 8 | SW 7 | SW 6 | SW 7 | SE 11 | SE 11 | SE 11 | SE 10 |
| kJ | 25 | 18 | 39 | 20 | 15 | 15 | 15 | 8 | 3 | 13 | 33 | 83 | 59 | 28 | 23 | 19 | 15 | 41 | 40 | 40 | 37 |
Swell 3 Height (m) Direction Period (s) | SE 8 | ENE 9 | SE 10 | SE 10 | E 9 | SE 13 | ENE 9 | SE 12 | ENE 10 | ENE 10 | ENE 10 | S 7 | SE 10 | SE 10 | SE 11 | SE 11 | SE 11 | SW 8 | NNE 4 | S 6 | S 7 |
| kJ | 23 | 8 | 16 | 16 | 6 | 6 | 8 | 6 | 10 | 10 | 10 | 15 | 25 | 26 | 43 | 43 | 40 | 2 | 3 | 3 | 4 |
Wind waves Height (m) Direction Period (s) | NNE 4 | SW 8 | — | E 3 | E 4 | E 4 | SSW 7 | S 5 | SSW 7 | SW 8 | NNE 5 | NE 4 | N 4 | — | — | — | NE 4 | NE 5 | ENE 8 | E 4 | ENE 4 |
| kJ | 32 | 419 | — | 1 | 2 | 8 | 32 | 93 | 294 | 719 | 57 | 40 | 3 | — | — | — | 55 | 56 | 181 | 13 | 11 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 40 | 41 | 53 | 41 | 41 | 191 | 41 | 111 | 103 | 55 | 41 | 79 | 0 | 0 | 0 | 0 | 40 | 198 | 0 | 87 | 103 |
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.
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