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 2 am Friday 19 Sep 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 26.8° C
(Which is slightly warmer than usual)

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 Sunday (Sep 21) at 3PM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.4m and 9s. Another secondary swell of 0.9m and 6s is also forecast. The wind is predicted to be glassy 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 Tuesday (Sep 23) at 6PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Tuesday (Sep 23) at 12AM.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	3PM (Sun 21st Sep)	3ft (0.9m) 6s
Best Surf	12PM (Thu 25th Sep)	3.5ft (1.1m) 9s
Most Powerful	6PM (Tue 23rd Sep)	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

Print Table

	Short Range Forecast Light rain (total 5mm), mostly falling on Fri morning. Warm (max 28°C on Sun afternoon, min 21°C on Fri morning). Mainly strong winds.									Days 3-6 Weather Summary Mostly dry. Warm (max 24°C on Mon afternoon, min 21°C on Mon morning). Mainly strong winds.
	Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wednesday 24			Thursday 25
	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	1	0	0	0	0	0	1	0	0	1	1	1	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SW	E	E	SE	SE	E	E	SW	SE	SSW	SSW	SSW	ESE	ESE	ESE	ESE	SW	ESE	E	E	ESE
Period(s) (?)	6	8	8	10	10	9	9	6	9	17	16	13	10	10	9	8	12	8	8	9	9
Wave Graph (?)
kJ (?)	6	168	19	25	23	56	78	56	23	29	95	183	300	335	249	221	181	393	205	154	129
Wind (km/h)	NE	NE	NE	NE	ESE	SW	SW	WNW	NNE	NE	NE	NE	NE	ENE	ENE	NE	ENE	NNE	NNE	N	WSW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- off	cross- off	cross- off	cross- off	off	cross- on	cross- on	glass	cross- off	cross- off	cross- off	cross- off	cross- off	off	cross- off	cross- off	off	cross- off	cross- off	cross	cross- on
High Tide / height (m)		4:13PM 1.41		3:18AM 1.43	4:29PM 1.44		4:01AM 1.49	4:45PM 1.47		4:41AM 1.52	5:02PM 1.51		5:17AM 1.51	5:19PM 1.53		5:53AM 1.48	5:37PM 1.54		6:29AM 1.43	5:55PM 1.53
Low Tide / height (m)	9:16AM 0.31		9:46PM 0.82	9:53AM 0.31		10:13PM 0.68	10:24AM 0.35		10:41PM 0.55	10:52AM 0.41		11:10PM 0.44	11:19AM 0.50		11:38PM 0.37	11:44AM 0.59		12:06AM 0.33		12:09PM 0.69	12:35AM 0.32

	Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wednesday 24			Thursday 25
Sunrise	5:26	-	-	5:28	-	-	5:28	-	-	5:28	-	-	5:30	-	-	5:31	-	-	5:31	-	-
Sunset	-	5:45	-	-	5:43	-	-	5:42	-	-	5:39	-	-	5:38	-	-	5:37	-	-	5:36	-

Rain (mm)	2	-	-	-	-	1	-	-	2	-	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	21	23	24	25	26	26	27	28	24	23	24	23	23	24	24	23	24	24	22	23	24
Feels °C (?)	16	20	23	26	28	27	23	30	19	17	19	18	18	19	19	19	20	21	21	24	23

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Izu Islands

Wind Update Offshore wind reported 1 km from Keta Reef Oshima (moderate winds from the NE at Oshima 1 km from Keta Reef Oshima). 0.5m 6s windswell from the SSW with a 0.2m 8s swell from the ESE and a 0.2m 9s swell from the SE. 3 swells combining to make bigger set waves.
53 minutes ago Keta Reef Oshima

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Actual: 53 min ago

24 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.