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Keta Reef Oshima Surf Forecast
/ Izu Islands (6 surf breaks) /
Surf Forecasts:
Keta Reef Oshima surfForecast / Izu Islands / Japan
48hr Weather and Surf, issued 8 pm Thursday 21 May 2026 JSTForecast update in hr min s Forecast update imminent
Keta Reef Oshima surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Keta Reef Oshima sea temperature is
20.6° C
(Which is slightly cooler than normal)How big are the waves at Keta Reef Oshima today?
The current surf forecast for Keta Reef Oshima at 1AM is: 1.3m 8s primary swell from a South-southwest direction and 0.5m 10s secondary swell from a East-southeast direction (forecast issued at 08:00pm May 21). An open ocean swell of 0.8m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (22 May) | 3.5ft (1.0m) | 8s |
| Afternoon (22 May) | 2.5ft (0.7m) | 8s |
| Evening (22 May) | 1.5ft (0.5m) | 8s |
Table - waves today at Keta Reef Oshima. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 27mm), heaviest during Thu night. Warm (max 20°C on Sun afternoon, min 14°C on Fri afternoon). Winds decreasing (gales from the NNE on Fri afternoon, light winds from the E by Sun afternoon). | ||||||||||||||||||||||||
Thu 21 | Friday 22 | Saturday 23 | Sunday 24 | |||||||||||||||||||||
6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | |
Swell Height Map |   |    |    |    | ||||||||||||||||||||
SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SW 8 | SSW 8 | SW 8 | SSW 8 | SW 7 | S 7 | S 7 | E 9 | E 9 | E 9 | E 10 | E 10 | ESE 10 | E 10 | E 10 | E 10 | E 9 | |
331 | 270 | 202 | 159 | 131 | 110 | 58 | 59 | 39 | 29 | 23 | 14 | 4 | 3 | 168 | 388 | 340 | 356 | 266 | 341 | 184 | 148 | 219 | 133 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | off | |
High Tide | 9:37PM1.22m | 7:12AM1.26m | 10:35PM1.18m | 8:19AM1.13m | 11:28PM1.15m | 10:06AM1.02m | ||||||||||||||||||
Low Tide | 2:14AM0.98m | 2:56PM0.16m | 3:31AM0.94m | 3:56PM0.31m | 5:15AM0.85m | |||||||||||||||||||
 |  |  |  | | | | |  | | | |  | | | | | | | | | |  | | |
 | — | — | — | 4:35 | — | — | — | — | — | — | — | 4:33 | — | — | — | — | — | — | — | 4:33 | — | — | — | — |
 | 6:42 | — | — | — | — | — | — | — | 6:43 | — | — | — | — | — | — | — | 6:43 | — | — | — | — | — | — | 6:44 |
3 | — | 2 | 14 | 3 | 2 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | — | |
Temp °C | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 15 | 14 | 14 | 14 | 14 | 14 | 15 | 16 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 |
13 | 13 | 12 | 10 | 9 | 7 | 6 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 9 | 13 | 14 | 15 | 16 | 16 | 18 | 18 | 18 | 20 | |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SW 8 | SSW 8 | SW 8 | SSW 8 | SW 7 | S 7 | S 7 | E 9 | S 6 | SSW 6 | SSW 6 | SE 6 | SE 12 | SE 6 | SE 7 | SE 7 | SE 7 |
 kJ | 331 | 270 | 202 | 159 | 131 | 110 | 58 | 59 | 39 | 29 | 23 | 14 | 4 | 3 | 168 | 3 | 4 | 4 | 45 | 6 | 64 | 85 | 65 | 79 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SW 8 | ESE 10 | — | SSE 8 | — | — | SW 8 | SE 7 | SW 7 | SW 7 | S 6 | — | — | SW 7 | SE 12 | SE 12 | SW 6 | E 9 |
| kJ | 54 | 54 | 52 | 52 | 51 | 36 | 33 | 36 | — | 6 | — | — | 2 | 2 | 2 | 2 | 3 | — | — | 2 | 6 | 6 | 2 | 133 |
Swell 3 Height (m) Direction Period (s) | E 8 | — | — | — | — | — | ESE 10 | — | — | — | — | — | SE 8 | SW 8 | — | — | — | — | — | — | — | — | — | SW 6 |
| kJ | 1 | — | — | — | — | — | 36 | — | — | — | — | — | 2 | 3 | — | — | — | — | — | — | — | — | — | 2 |
Wind waves Height (m) Direction Period (s) | NE 2 | NE 4 | NE 4 | NE 4 | NNE 4 | NNE 5 | NNE 5 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 5 | E 9 | E 9 | E 10 | E 10 | ESE 10 | E 10 | E 10 | E 10 | — |
| kJ | 1 | 10 | 15 | 24 | 38 | 70 | 139 | 298 | 428 | 398 | 340 | 268 | 242 | 252 | 126 | 388 | 340 | 356 | 266 | 341 | 184 | 148 | 219 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 41 | 47 | 53 | 453 | 58 | 453 | 107 | 453 | 453 | 516 | 516 | 516 | 761 | 766 | 843 | 843 | 843 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Izu Islands | ||||||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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