Rock Island Surf Forecast

/ Kanagawa (21 surf breaks) /

Japan (129 surf breaks)

Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

48hr Weather and Surf, issued 2 pm Tuesday 16 Sep 2025 JST

Forecast update in hr min s Forecast update imminent

Rock Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.

Today's Rock Island sea temperature is 26.8° C
(Which is 1.0°C warmer than normal for this time of year)

How big are the waves at Rock Island today?

The current surf forecast for Rock Island at 8PM is: 0.2m 9s primary swell from a East-southeast direction and 0.1m 11s secondary swell from a South direction, 0.3m 3s secondary swell from a South direction (forecast issued at 02:00pm September 16). The wind direction is predicted to be cross-onshore.

Time (JST) & Date	Wave Height	Wave Period
Morning (16 Sep)	-	-
Afternoon (16 Sep)	0.5ft (0.2m)	9s
Evening (16 Sep)	0.5ft (0.2m)	9s

Table - waves today at Rock Island. (Swell directed towards the surf break)

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Tuesday 16				Wednesday 17								Thursday 18								Friday 19
	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	6 AM	9 AM
Rating (10 max)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SE	ESE	ESE	ESE	S	SE	SE	SE	ESE	SSW	SSW	SSW	SSW	SSW	SSW	SW	SSW	SSW	SSW	SSW	SSW	SSE	SSE	E
Period(s) (?)	9	9	9	9	11	11	11	10	10	4	5	5	5	5	6	6	6	6	6	6	6	9	9	9
Wave Graph (?)
Energy (?)	21	14	12	11	11	14	30	43	16	22	37	35	66	85	90	108	53	56	68	43	34	19	15	12
Wind (km/h)	S	S	S	S	SSW	SSW	SW	SSW	S	S	SSW	SW	SW	WSW	SW	SSW	SW	SSW	NNE	ENE	NE	NE	ENE	NE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	on	cross- on	on	on	on	on	on	on	on	on	on	cross- on	cross- on	cross- on	on	on	on	off	cross- off	cross- off	cross- off	cross- off	off
High Tide / height (m)		1:53PM 1.24			9:44PM 1.35						3:10PM 1.30		11:30PM 1.29						3:43PM 1.36			1:25AM 1.31
Low Tide / height (m)			4:31PM 1.21					6:31AM 0.43				7:25PM 1.21				7:50AM 0.40				8:47PM 1.11				8:52AM 0.37

	Tuesday 16				Wednesday 17								Thursday 18								Friday 19
Sunrise	-	-	-	-	-	-	5:24	-	-	-	-	-	-	-	5:24	-	-	-	-	-	-	-	5:26	-
Sunset	-	5:47	-	-	-	-	-	-	-	5:46	-	-	-	-	-	-	-	5:45	-	-	-	-	-	-

Rain (mm)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	1	2	1	1	2	9
Temp. °C	28	28	27	27	26	26	26	27	28	29	29	28	28	28	27	27	30	31	27	23	23	22	20	19
Feels °C (?)	31	30	29	29	28	28	29	30	30	31	31	30	30	31	31	29	31	33	23	21	22	20	17	17

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 Kanagawa

Wind Update Continuing clean conditions at Rock Island (calm at Zushi Kanagawa 1 km from Rock Island). 0.3m 9s swell from the SE with a 0.2m 5s windswell from the SSW and a 0.2m 2s local chop from the S. 3 swells combining to make bigger set waves.
1 hour 22 minutes ago Rock Island

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1 h 22 min ago

5 km/h

ENE

Clean

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