Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Keta Reef Oshima surfForecast / Izu Islands / Japan
48hr Weather and Surf, issued 8 am Friday 19 Dec 2025 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
19.4° C
(Which is normal for this time of year)How big are the waves at Keta Reef Oshima today?
The current surf forecast for Keta Reef Oshima at 10AM is: 0.2m 11s primary swell from a East-southeast direction and 0.4m 4s secondary swell from a East-southeast direction (forecast issued at 08:00am December 19). An open ocean swell of 0.6m 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 (19 Dec) | 0.5ft (0.2m) | 11s |
| Afternoon (19 Dec) | 0.5ft (0.2m) | 13s |
| Evening (19 Dec) | 2ft (0.6m) | 5s |
Table - waves today at Keta Reef Oshima. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 19 | Saturday 20 | Sunday 21 | Mon 22 | |||||||||||||||||||||
| 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 11 | 11 | 13 | 11 | 5 | 13 | 12 | 12 | 12 | 12 | 6 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 10 | 11 | 11 | 14 | 11 | 15 | 13 | 12 | 11 | 11 | 11 | 272 | 332 | 342 | 362 | 220 | 255 | 356 | 441 | 1064 | 694 | 379 | 349 | 417 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | glass | glass | cross | cross | cross- off | cross | cross | cross- on | on | cross- on | cross | cross | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- off |
High Tide / height (m) | 5:20AM 1.33 | 3:19PM 1.40 | 5:54AM 1.36 | 3:54PM 1.41 | 6:28AM 1.37 | 4:28PM 1.42 | ||||||||||||||||||
Low Tide / height (m) | 10:13AM 0.95 | 10:38PM 0.03 | 10:50AM 0.95 | 11:12PM -0.00 | 11:25AM 0.94 | 11:46PM -0.01 | ||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | Mon 22 | |||||||||||||||||||||
| Sunrise | - | 6:43 | - | - | - | - | - | - | - | 6:43 | - | - | - | - | - | - | - | 6:45 | - | - | - | - | - | - |
| Sunset | - | - | - | 4:34 | - | - | - | - | - | - | - | 4:34 | - | - | - | - | - | - | - | 4:34 | - | - | - | - |
 |  |  |  | | |  |  | | | |  | | | | |  |  | | |  | | | | |
Rain (mm) | - | - | - | - | - | - | 1 | 1 | - | - | - | 1 | 3 | 2 | 3 | 4 | 14 | 13 | 12 | 2 | - | - | - | - |
| Temp. °C | 11 | 11 | 11 | 12 | 14 | 15 | 16 | 17 | 17 | 18 | 18 | 17 | 16 | 17 | 18 | 17 | 17 | 18 | 17 | 16 | 17 | 17 | 17 | 15 |
| Feels °C (?) | 6 | 6 | 6 | 9 | 13 | 14 | 14 | 12 | 11 | 12 | 13 | 16 | 16 | 15 | 13 | 11 | 11 | 13 | 10 | 9 | 11 | 10 | 15 | 9 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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