Surf Forecasts:
Rock Island surf forecast from 18 Jun 2026:
- Best quality surf: Friday 19 Jun, 12AM (local time) - 2ft (0.6m), 7s period, SSE swell with cross-offshore winds.
- Most powerful swell: Sunday 21 Jun, 6AM (local time) - 5ft (1.6m), 6s period, SSW swell with 179 kJ wave energy.
- Next surfable swell (1★+): Friday 19 Jun, 12AM (local time) - 2ft (0.6m), 7s period with SSE swell.
Best Forecast Surf Conditions for Rock Island this week:
The surf forecast for Rock Island over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Jun 19) at 12AM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.6m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Rock Island in the next 16 days are 1.6m 6s and forecast to arrive on Sunday (Jun 21) at 6AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Tuesday (Jun 23) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 19th Jun) | 2ft (0.6m) 7s |
| Best Surf | 12AM (Fri 19th Jun) | 2ft (0.6m) 7s |
| Most Powerful | 6AM (Sun 21st Jun) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Rock Island over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 38mm), heaviest during Sun morning. Warm (max 25°C on Sun afternoon, min 21°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Warm (max 23°C on Sun night, min 17°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thu 25 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSE 7 | S 7 | S 6 | SSE 10 | SSE 10 | SSE 10 | SSE 4 | S 6 | S 7 | S 7 | SE 10 | SE 10 | SSW 7 | SSW 7 | SE 11 | SSE 11 | SSE 11 | SE 11 | SSE 10 | SSE 10 | SSE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 40 | 23 | 20 | 10 | 9 | 9 | 41 | 62 | 47 | 35 | 16 | 16 | 29 | 18 | 20 | 12 | 11 | 18 | 11 | 10 | 10 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | on | cross-off | cross-off | glassy | cross-on | on | off | off | off | on | off | off | on | cross-off | off | cross-off | off | off | off |
High Tide | 6:20AM1.42m | 8:53PM1.37m | 7:09AM1.36m | 9:28PM1.35m | 8:05AM1.28m | 10:04PM1.33m | 9:12AM1.19m | 10:40PM1.32m | 10:34AM1.11m | 11:18PM1.31m | 12:14PM1.08m | 11:58PM1.32m | 1:55PM1.11m | ||||||||
Low Tide | 1:14AM0.98m | 1:38PM0.05m | 2:01AM0.93m | 2:19PM0.17m | 2:54AM0.87m | 3:02PM0.31m | 3:53AM0.80m | 3:47PM0.46m | 4:58AM0.71m | 4:37PM0.61m | 6:05AM0.59m | 5:35PM0.76m | 7:09AM0.46m | ||||||||
 |  |  |  |  | |  |  | | |  | |  | | |  | | | | | | |
 | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:28 | — |
 | 6:58 | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 |
mm | 1 | — | — | — | 3 | 3 | 18 | 13 | — | — | — | — | — | — | — | 6 | — | — | — | — | — |
Temp °C | 22 | 23 | 24 | 22 | 21 | 21 | 22 | 24 | 25 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 19 | 21 | 22 |
Feels °C | 24 | 24 | 25 | 24 | 21 | 24 | 19 | 26 | 26 | 21 | 23 | 24 | 24 | 20 | 21 | 22 | 18 | 17 | 16 | 19 | 20 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | S 7 | SSE 10 | SSE 6 | SE 5 | SSW 7 | SE 12 | S 6 | S 7 | S 7 | S 6 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSE 11 | SSE 11 | SE 11 | SSE 10 | SSE 10 | SSE 10 |
| kJ | 35 | 23 | 10 | 6 | 4 | 4 | 6 | 62 | 47 | 35 | 13 | 15 | 29 | 18 | 4 | 12 | 11 | 18 | 11 | 10 | 10 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SE 10 | SW 8 | SSE 10 | SSE 10 | SSE 10 | E 9 | SSE 11 | SE 11 | SSE 10 | SE 10 | SE 10 | SSE 10 | SSE 12 | SE 11 | S 6 | S 8 | S 10 | S 10 | S 8 | S 8 |
| kJ | 40 | 4 | 2 | 10 | 9 | 9 | 2 | 12 | 5 | 10 | 16 | 16 | 10 | 13 | 20 | 1 | 1 | 2 | 2 | 6 | 5 |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SW 8 | SE 14 | SSW 7 | SSW 7 | SE 12 | SE 12 | S 9 | SE 9 | E 7 | SSW 8 | E 10 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | S 8 | S 13 | SW 11 |
| kJ | 8 | 2 | 7 | 5 | 5 | 6 | 6 | 2 | 3 | 4 | 6 | 7 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 3 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | S 6 | ESE 3 | — | SSE 4 | SSE 4 | — | — | NNE 3 | — | — | — | NNE 2 | — | ENE 3 | NE 3 | ESE 5 | ESE 3 | SE 4 | SSE 4 |
| kJ | — | — | 20 | 2 | — | 8 | 41 | — | — | 3 | — | — | — | 1 | — | 3 | 2 | 5 | 1 | 3 | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 16 | 77 | 104 | 249 | 77 | 77 | 136 | 0 | 0 | 55 | 16 | 38 | 51 | 16 | 16 | 228 | 64 | 61 | 74 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Rock Island surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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 16 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.
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