Rock Island 48 hour detailed Surf Forecast

Lat Long: 35.29° N 139.55° E

Issued: 8 pm 16 Jul 2026 (local time)

Forecast update in hr min

Today's Rock Island sea temperature is

25.1° C

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

Surf Forecasts:

How big are the waves at Rock Island today (17 Jul):

Morning surf: Morning surf (17 Jul, local time) - 0.5ft (0.2m), 8s period with SSW swell.
Afternoon surf: Afternoon surf (17 Jul, local time) - 0.5ft (0.2m), 8s period with SSW swell.
Evening surf: Evening surf (17 Jul, local time) - 0.5ft (0.2m), 8s period with SSW swell.

The current surf forecast for Rock Island at 2AM is: 0.3m 8s primary swell from a South-southwest direction and 0.1m 10s secondary swell from a Southeast direction (forecast issued at 08:00pm July 16). The wind direction is predicted to be cross-shore.

Time (JST) & Date	Wave Height	Wave Period
Morning (17 Jul)	0.5ft (0.2m)	8s
Afternoon (17 Jul)	0.5ft (0.2m)	8s
Evening (17 Jul)	0.5ft (0.2m)	8s

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

	Short Range Forecast Light rain (total 2mm), mostly falling on Fri morning. Warm (max 28°C on Thu night, min 25°C on Fri night). Wind will be generally light.
	Thu 16		Friday 17								Saturday 18
	6 PM	9 PM	12 AM	3 AM	6 AM	9 AM	12 PM	3 PM	6 PM	9 PM	12 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
Swell Height Map See all maps
Wave Height (m) Direction Period (s)	S 5	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSE 9	SE 9	SE 9	SE 9	SE 8	SE 8	SE 8	SE 8
Wave Graph
kJ	7	6	13	13	6	6	6	6	6	6	8	12	12	12	11	11	11	10
Wind (km/h)	S	SSW	SSE	ESE	E	ESE	S	SSE	SSE	SE	SSE	SE	SE	S	S	SSW	S	S
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy	on	on	cross-on	cross	cross-off	cross	cross-on	cross-on	cross-on	cross-on	cross-on	cross-on	glassy	glassy	on	on	on	cross-on
High Tide		7:13PM1.45m			5:38AM1.50m					7:41PM1.45m				6:25AM1.48m				8:09PM1.43m
Low Tide				00:20AM0.94m				12:43PM0.07m				00:59AM0.86m				1:20PM0.16m


	—	—	—	4:39	—	—	—	—	—	—	—	4:39	—	—	—	—	—	—
	6:55	—	—	—	—	—	—	—	6:55	—	—	—	—	—	—	—	6:54	—
mm	—	—	—	—	—	—	1	1	—	—	—	—	—	—	—	—	—	—
Temp °C	29	28	27	27	27	28	28	27	27	26	25	25	25	26	27	27	26	26
Feels °C	32	31	31	31	31	32	31	29	29	28	27	28	30	30	29	28	28	28
Swell 1 Height (m) Direction Period (s)	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SSW 8	SE 9	SSE 9	SSE 4	SSE 4	SSE 4	SE 8	SE 8	SE 8	SE 8
kJ	7	6	13	13	6	6	6	6	6	3	8	3	3	2	11	11	11	10
Swell 2 Height (m) Direction Period (s)	SE 10	SE 10	SSE 4	SE 10	SSE 4	SSE 4	SE 10	SE 9	SE 9	SSW 8	SSW 8	SE 9	SE 9	SE 9	S 8	S 9	S 9	S 8
kJ	4	4	2	4	1	2	4	3	3	6	6	12	12	12	1	2	2	1
Swell 3 Height (m) Direction Period (s)	S 8	SE 8	SE 10	SSE 4	SE 9	SE 10	E 8	E 8	E 8	E 8	E 10	SW 8	SW 8	SW 7	S 9	S 8	S 8	SW 8
kJ	1	3	4	2	3	4	1	1	1	1	2	2	2	2	2	1	1	2
Wind waves Height (m) Direction Period (s)	S 5	S 4	—	—	—	—	SSE 4	S 3	SSE 4	SSE 4	SSE 4	—	—	—	SSE 4	SSE 3	SSE 3	S 4
kJ	7	4	—	—	—	—	3	5	4	5	3	—	—	—	3	2	3	2
Nearest Offshore or Glassy	Tsurigasaki Surfing Beach (Tokyo 2020) Chiba	Tsurigasaki Surfing Beach (Tokyo 2020) Chiba	Chikura Chiba	Chikura Chiba	Mera Chiba	Kurihama Kanagawa	Keta Reef Oshima Izu Islands	Osaki Point Shikoku	Ohara Chiba	Ohara Chiba	Keta Reef Oshima Izu Islands	Ohara Chiba	Mera Chiba	Ohara Chiba	Keta Reef Oshima Izu Islands	Keta Reef Oshima Izu Islands	Keta Reef Oshima Izu Islands	Keta Reef Oshima Izu Islands
Rating (10 max)	1	1	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	1
Distance (km)	76	76	54	54	51	16	64	534	77	77	64	77	51	77	64	64	64	64
Best forecast wave conditions in Kanagawa						Uraga Point
Rating (10 max)						1
Best forecast wave conditions in Japan	Niijima - Habushiura Izu Islands	Niijima - Habushiura Izu Islands	Niijima - Habushiura Izu Islands	Niijima - Habushiura Izu Islands	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Niyodo Rivermouth Shikoku	Kudaka Okinawa	Keta Reef Oshima Izu Islands	Keta Reef Oshima Izu Islands	Keta Reef Oshima Izu Islands	Omaezaki Shizuoka
Rating (10 max)	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	1
Header Global	Dunedin - Bobs Beach New Zealand	Easter Reef Australia	Easter Reef Australia	Easter Reef Australia	Easter Reef Australia	Easter Reef Australia	Easter Reef Australia	East Pier (Port Alfred) South Africa	Easter Reef Australia	Dunedin - Bobs Beach New Zealand	Dunedin - Bobs Beach New Zealand	Dunedin - Bobs Beach New Zealand	Dunedin - Bobs Beach New Zealand	Seconds (White Rock) New Zealand	Otago Peninsula - Allans Beach New Zealand	Papatowai New Zealand	Papatowai New Zealand	Papatowai New Zealand
Rating (10 max)	8	5	5	5	6	6	6	5	5	6	7	7	6	9	7	9	9	7

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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Rock Island 48 hour detailed Surf Forecast

How big are the waves at Rock Island today (17 Jul):

Short Range Forecast

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