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

48hr 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)

How big are the waves at Keta Reef Oshima today?

The current surf forecast for Keta Reef Oshima at 6AM is: 0.3m 10s primary swell from a Southeast direction and 0.4m 6s secondary swell from a Southwest direction (forecast issued at 02:00am September 19). An open ocean swell of 1.2m 5s 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 Sep)	1ft (0.3m)	6s
Afternoon (19 Sep)	4ft (1.2m)	8s
Evening (19 Sep)	3.5ft (1.0m)	8s

Table - waves today at Keta Reef Oshima. (Swell directed towards the surf break)

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Friday 19								Saturday 20								Sunday 21
	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	6 AM	9 AM	12 PM	3 PM	6 PM	9 PM
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SW	SE	SE	SW	ENE	E	E	E	E	SE	SE	SE	SE	SE	SE	SE	E	E	E	E	SW	SW	SW	SW
Period(s) (?)	6	10	10	6	7	8	8	8	8	10	10	10	10	10	9	11	9	9	9	9	6	6	6	6
Wave Graph (?)
kJ (?)	37	25	15	6	191	168	149	120	19	24	23	25	25	23	23	29	56	76	76	78	57	56	72	69
Wind (km/h)	NE	NNE	NNE	NE	NE	NE	NE	NE	NE	NNE	NE	NE	ENE	ESE	SSW	SW	SW	SW	SW	SW	W	WNW	E	ENE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	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	cross	cross- on	cross- on	cross- on	cross- on	cross- on	on	glass	off	cross- off
High Tide / height (m)		2:25AM 1.35					4:13PM 1.41				3:18AM 1.43				4:29PM 1.44				4:01AM 1.49				4:45PM 1.47
Low Tide / height (m)	9:20PM 0.97				9:16AM 0.31				9:46PM 0.82				9:53AM 0.31				10:13PM 0.68				10:24AM 0.35

	Friday 19								Saturday 20								Sunday 21
Sunrise	-	-	5:26	-	-	-	-	-	-	-	5:28	-	-	-	-	-	-	-	5:28	-	-	-	-	-
Sunset	-	-	-	-	-	5:45	-	-	-	-	-	-	-	5:43	-	-	-	-	-	-	-	5:42	-	-

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

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 The wind is still cross-off at Keta Reef Oshima (moderate winds from the NE at Oshima 1 km from Keta Reef Oshima). 0.4m 6s windswell from the SSW to make surfable waves.
1 hour 20 minutes ago Keta Reef Oshima

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1 h 20 min ago

24 km/h

Cross-Off

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