Rock Island Surf Forecast

/ Kanagawa (21 surf breaks) /

Japan (129 surf breaks)

Surf Forecasts:

Rock Island surfForecast / Kanagawa / Japan

12 Day Weather and Surf, issued 2 pm Sunday 09 Nov 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 19.6° C
(Which is 2.1°C colder than average for this time of year)

Best Forecast Surf Conditions for Rock Island this week:

The surf forecast for Rock Island over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Nov 09) at 6PM. The primary swell is predicted to be 1.1m and 5s period with a secondary swell of 0.7m and 6s. Another secondary swell of 0.2m and 13s is also forecast. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Rock Island in the next 12 days are 0.7m 14s and forecast to arrive on Wednesday (Nov 12) at 12AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Monday (Nov 10) at 6PM.

Wave Type	Time (JST) & Date	Wave Height & Period
Next good surf (1 star+)	6PM (Sun 9th Nov)	3.5ft (1.1m) 5s
Best Surf	12AM (Mon 10th Nov)	3ft (0.9m) 8s
Most Powerful	12AM (Wed 12th Nov)	2.5ft (0.7m) 14s

Table - best surf conditions forecast for Rock Island over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Moderate rain (total 14mm), heaviest on Sun afternoon. Very mild (max 19°C on Mon afternoon, min 11°C on Tue night). Winds increasing (calm on Sun night, fresh winds from the NNE by Mon afternoon).											Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Thu night. Very mild (max 18°C on Fri afternoon, min 14°C on Wed afternoon). Winds increasing (light winds from the SSE on Wed afternoon, fresh winds from the NNE by Thu night).
	Sun 09		Monday 10			Tuesday 11			Wednesday 12			Thursday 13			Friday 14			Saturday 15
	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM
Rating (10 max)	0	2	1	1	0	1	2	1	1	1	0	0	0	0	0	0	0	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SSE	SSE	SSW	SSW	S	SSW	S	SSW	SSW	SSW	SSW	SSW	SSW	SSW	SSE	SSW	SE	SE	SE	SE	SE
Period(s) (?)	6	8	8	9	12	13	13	14	13	12	11	11	10	10	6	9	9	10	9	8	8
Wave Graph (?)
kJ (?)	25	98	85	65	10	33	125	210	133	82	41	22	10	19	10	8	14	23	21	24	10
Wind (km/h)	S	N	NE	E	NNE	NNE	ENE	NNE	NNE	SSE	SW	WNW	SSW	NNE	NNE	ENE	ESE	NE	ENE	N	N
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	glass	off	off	cross- off	off	off	cross- off	off	off	glass	on	cross	on	off	off	cross- off	cross	off	cross- off	off	off
High Tide / height (m)		6:01PM 1.52	8:51AM 1.40		6:35PM 1.47	9:47AM 1.36		7:15PM 1.40	10:48AM 1.33		8:09PM 1.31	11:48AM 1.31		9:30PM 1.21		12:40PM 1.32	11:25PM 1.15		1:21PM 1.33	1:12AM 1.18
Low Tide / height (m)		1:26AM 0.07		1:31PM 1.09	2:11AM 0.14		2:21PM 1.12	3:00AM 0.24		3:31PM 1.12		3:58AM 0.35	5:06PM 1.06		5:05AM 0.46		6:35PM 0.95	6:16AM 0.56		7:37PM 0.79	7:23AM 0.63

	Sun 09		Monday 10			Tuesday 11			Wednesday 12			Thursday 13			Friday 14			Saturday 15
Sunrise	-	-	6:09	-	-	6:11	-	-	6:11	-	-	6:13	-	-	6:13	-	-	6:15	-	-	6:16
Sunset	4:39	-	-	4:38	-	-	4:38	-	-	4:37	-	-	4:37	-	-	4:36	-	-	4:36	-	-

Rain (mm)	11	3	-	-	-	-	-	-	-	-	-	-	1	3	-	-	-	-	-	-	-
Temp. °C	14	17	18	19	14	13	15	15	13	14	16	16	17	16	17	18	16	15	16	16	16
Feels °C (?)	13	17	16	17	7	9	11	12	9	11	11	15	15	16	14	16	13	11	14	16	15

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 Rock Island Surf forecast

The above surf forecast table for Rock Island provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Rock Island can be found by selecting the local surf guide option on the grey menu. Our Rock Island 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 (Rock Island) 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 Rock Island 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.

Rock Island is 3 km (2 miles) from the city of Kamakura. If you plan a holiday in Kanagawa, look for hotels and other accommodation in Kamakura. Kamakura has rooms for a wide range of budgets as well as car hire and transport links.