Keta Reef Oshima Surf Forecast

/ Izu Islands (6 surf breaks) /

Japan (129 surf breaks) / Lat Long: (34.74° N 139.36° E)

Surf Forecasts:

Keta Reef Oshima surfForecast / Izu Islands / Japan

12 Day Weather and Surf, issued 8 am Monday 03 Nov 2025 JST

Forecast 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 22.1° C
(Which is slightly cooler than normal)

Best Forecast Surf Conditions for Keta Reef Oshima this week:

The surf forecast for Keta Reef Oshima over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Nov 07) at 3PM. The primary swell is predicted to be 1.2m and 10s period with a secondary swell of 0.1m and 12s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Keta Reef Oshima in the next 12 days are 1.6m 10s and forecast to arrive on Thursday (Nov 06) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Monday (Nov 03) at 9PM.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	3PM (Fri 7th Nov)	4ft (1.2m) 10s
Best Surf	6AM (Sat 8th Nov)	4.5ft (1.3m) 11s
Most Powerful	9PM (Thu 6th Nov)	5ft (1.6m) 10s

Table - best surf conditions forecast for Keta Reef Oshima over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Mostly dry. Very mild (max 18°C on Mon afternoon, min 13°C on Tue morning). Winds decreasing (strong winds from the NNE on Mon night, light winds from the NNE by Tue night).									Days 3-6 Weather Summary Some drizzle, heaviest during Sat morning. Very mild (max 18°C on Fri afternoon, min 15°C on Thu morning). Winds decreasing (strong winds from the NNE on Thu morning, calm by Sat night).
	Monday 03			Tuesday 04			Wednesday 05			Thursday 06			Friday 07			Saturday 08			Sunday 09
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	WSW	SW	ESE	SE	SE	SE	ESE	SE	ESE	ESE	ESE	ESE	ESE	ESE	E	E	E	E	ESE	ESE	ESE
Period(s) (?)	5	7	10	9	9	9	9	10	8	8	9	10	10	10	10	11	10	10	10	10	9
Wave Graph (?)
kJ (?)	113	75	37	22	22	22	32	23	149	273	339	419	352	300	302	389	302	204	223	221	186
Wind (km/h)	W	NE	NNE	NE	NE	NNE	NNE	NE	NNE	NNE	NNE	NNE	NNE	ENE	SSE	NNE	NNE	NW	SSW	SW	SW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	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	cross- off	cross- off	cross- off	glass	cross- on	cross- on	cross- on
High Tide / height (m)		2:55PM 1.44		3:38AM 1.45	3:20PM 1.50		4:29AM 1.53	3:47PM 1.55		5:20AM 1.55	4:15PM 1.58		6:10AM 1.54	4:45PM 1.60		7:02AM 1.48	5:15PM 1.58		7:58AM 1.39	5:48PM 1.52
Low Tide / height (m)			9:17PM 0.33	9:30AM 0.61		9:54PM 0.14	10:09AM 0.71		10:33PM -0.01	10:48AM 0.81		11:12PM -0.09	11:24AM 0.91		11:54PM -0.11	12:00PM 1.00		12:38AM -0.06		12:37PM 1.07	1:25AM 0.04

	Monday 03			Tuesday 04			Wednesday 05			Thursday 06			Friday 07			Saturday 08			Sunday 09
Sunrise	6:03	-	-	6:03	-	-	6:05	-	-	6:05	-	-	6:07	-	-	6:07	-	-	6:09	-	-
Sunset	-	4:46	-	-	4:45	-	-	4:45	-	-	4:45	-	-	4:44	-	-	4:43	-	-	4:42	-

Rain (mm)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1	-	-	1	3	6
Temp. °C	17	18	16	14	15	15	15	17	17	15	17	17	17	18	18	15	16	17	20	21	21
Feels °C (?)	7	13	5	9	11	12	9	11	11	7	12	13	11	16	15	12	14	17	13	13	13

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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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 12 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.