Surf Forecasts:
Rock Island surf forecast from 27 Sep 2026:
- Best quality surf: Thursday 1 Oct, 9PM (local time) - 5.5ft (1.7m), 10s period, S swell with offshore winds.
- Most powerful swell: Thursday 1 Oct, 9PM (local time) - 5.5ft (1.7m), 10s period, S swell with 569 kJ wave energy.
- Next surfable swell (1★+): Monday 28 Sep, 9PM (local time) - 3ft (0.9m), 7s period with SSW 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 Monday (Sep 28) at 9PM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.6m and 7s. Another secondary swell of 0.1m and 8s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Rock Island in the next 16 days are 1.7m 10s and forecast to arrive on Thursday (Oct 01) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Thursday (Oct 01) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 28th Sep) | 3ft (0.9m) 7s |
| Best Surf | 9PM (Thu 1st Oct) | 5.5ft (1.7m) 10s |
| Most Powerful | 9PM (Thu 1st Oct) | 5.5ft (1.7m) 10s |
Table - best surf conditions forecast for Rock Island over the next 16 days.
Short Range ForecastHeavy rain (total 53mm), heaviest during Tue afternoon. Warm (max 25°C on Mon afternoon, min 17°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 96mm), heaviest during Fri morning. Warm (max 23°C on Thu afternoon, min 15°C on Fri morning). Winds increasing (calm on Thu morning, strong winds from the NE by Fri morning). | ||||||||||||||||||
Monday 28 | Tuesday 29 | Wednesday 30 | Thursday 1 | Friday 2 | Saturday 3 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | S 7 | SSW 5 | SSW 5 | S 7 | S 7 | SW 13 | SW 12 | SW 12 | SSW 11 | SSW 11 | SSW 11 | S 11 | S 10 | SSE 8 | SSE 7 | SSE 7 | SSE 10 | SE 10 | SE 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 24 | 27 | 32 | 59 | 32 | 27 | 39 | 65 | 81 | 99 | 210 | 275 | 474 | 87 | 21 | 4 | 9 | 38 | 55 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | off | off | off | off | off | off | glassy | on | off | off | off | off | off | off | off |
High Tide | 6:01AM1.58m | 5:48PM1.52m | 6:45AM1.56m | 6:11PM1.53m | 7:30AM1.50m | 6:36PM1.53m | 8:19AM1.43m | 7:01PM1.52m | 9:17AM1.35m | 7:29PM1.49m | 10:31AM1.28m | 8:03PM1.43m | |||||||
Low Tide | 11:38PM0.39m | 11:59AM0.62m | 00:13AM0.30m | 12:30PM0.72m | 00:49AM0.25m | 1:00PM0.83m | 1:28AM0.23m | 1:30PM0.94m | 2:11AM0.25m | 2:01PM1.04m | 3:00AM0.30m | 2:40PM1.12m | |||||||
 |  |  |  | |  |  | | |  | | | | |  |  |  | | | |
 | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — |
 | — | — | 5:30 | — | — | 5:30 | — | — | 5:28 | — | — | 5:27 | — | — | 5:24 | — | — | 5:23 | — |
mm | 1 | 1 | — | — | 3 | 28 | 18 | — | 2 | 1 | — | 1 | 52 | 41 | 1 | — | — | — | — |
Temp °C | 23 | 24 | 25 | 24 | 21 | 19 | 18 | 18 | 18 | 19 | 21 | 23 | 21 | 17 | 18 | 19 | 19 | 21 | 18 |
Feels °C | 24 | 24 | 25 | 27 | 18 | 17 | 17 | 16 | 16 | 18 | 23 | 26 | 22 | 12 | 14 | 14 | 13 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | S 7 | SE 9 | SSW 5 | S 7 | S 7 | SSW 6 | SW 12 | SW 12 | SSW 11 | SSW 11 | SSW 11 | S 11 | S 10 | SSE 8 | SSE 7 | SSE 7 | SSE 6 | SE 10 | SE 11 |
| kJ | 24 | 3 | 32 | 59 | 32 | 13 | 39 | 65 | 81 | 99 | 210 | 275 | 474 | 87 | 21 | 4 | 4 | 38 | 55 |
Swell 2 Height (m) Direction Period (s) | SE 13 | — | SSE 9 | SW 16 | SW 13 | SW 13 | SSW 6 | SE 9 | SE 8 | SE 8 | SE 8 | E 9 | SSW 10 | SSW 8 | — | SE 4 | SSE 10 | E 15 | E 15 |
| kJ | 7 | — | 7 | 9 | 28 | 27 | 8 | 3 | 3 | 3 | 3 | 6 | 288 | 22 | — | 2 | 9 | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | SE 13 | — | E 9 | S 13 | SE 9 | SE 9 | SE 9 | E 7 | SSE 8 | SE 12 | SE 11 | E 18 | — | SW 8 | — | SE 9 | — | E 10 | E 9 |
| kJ | 7 | — | 2 | 3 | 3 | 3 | 3 | 1 | 7 | 5 | 5 | 6 | — | 3 | — | 3 | — | 2 | 2 |
Wind waves Height (m) Direction Period (s) | — | SSW 5 | — | — | NE 3 | NNE 3 | NNE 3 | NE 2 | NNE 2 | — | NE 3 | NNE 2 | NNE 3 | N 3 | — | — | NE 2 | — | — |
| kJ | — | 27 | — | — | 2 | 3 | 2 | 1 | 1 | — | 2 | 1 | 4 | 5 | — | — | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 76 | 505 | 470 | 14 | 7 | 38 | 0 | 0 | 0 | 0 | 0 | 14 | 8 | 999 | 228 | 145 | 488 | 228 | 145 |
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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