Surf Forecasts:
Rock Island surf forecast from 22 Oct 2026:
- Best quality surf: Friday 23 Oct, 9AM (local time) - 3.5ft (1.1m), 13s period, S swell with offshore winds.
- Most powerful swell: Thursday 22 Oct, 6PM (local time) - 4ft (1.2m), 13s period, S swell with 499 kJ wave energy.
- Next surfable swell (1★+): Friday 23 Oct, 9AM (local time) - 3.5ft (1.1m), 13s period with S 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 (Oct 23) at 9AM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.7m and 9s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Rock Island in the next 16 days are 1.2m 13s and forecast to arrive on Thursday (Oct 22) at 6PM. Winds are predicted to be cross-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 Friday (Oct 23) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Fri 23rd Oct) | 3.5ft (1.1m) 13s |
| Best Surf | 9AM (Fri 23rd Oct) | 3.5ft (1.1m) 13s |
| Most Powerful | 6PM (Thu 22nd Oct) | 4ft (1.2m) 13s |
Table - best surf conditions forecast for Rock Island over the next 16 days.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sat afternoon. Warm (max 21°C on Thu morning, min 16°C on Thu night). Winds decreasing (fresh winds from the NE on Thu morning, calm by Sat night). | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Sun afternoon. Warm (max 23°C on Mon night, min 15°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | Wednesday 28 | |||||||||||||||
AM | PM | 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) | SSE 13 | S 14 | S 14 | S 13 | S 13 | SSW 13 | SW 14 | SSW 14 | SSW 14 | SSW 12 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SE 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | S 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 356 | 432 | 496 | 411 | 202 | 249 | 92 | 178 | 163 | 86 | 55 | 81 | 40 | 22 | 12 | 408 | 163 | 61 | 6 | 5 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | off | cross | cross-off | off | off | off | off | off | cross-off | off | off | on | cross-on | off | cross-off | off | cross | off |
High Tide | 2:50PM1.37m | 2:38AM1.31m | 3:17PM1.40m | 3:38AM1.40m | 3:43PM1.43m | 4:29AM1.47m | 4:08PM1.47m | 5:15AM1.52m | 4:33PM1.50m | 6:00AM1.53m | 4:59PM1.53m | 6:45AM1.52m | 5:26PM1.54m | ||||||||
Low Tide | 8:51PM0.77m | 8:56AM0.57m | 9:28PM0.60m | 9:41AM0.62m | 10:04PM0.44m | 10:20AM0.68m | 10:39PM0.30m | 10:56AM0.75m | 11:14PM0.19m | 11:30AM0.83m | 11:51PM0.12m | 12:03PM0.91m | 00:28AM0.08m | ||||||||
 |  |  | | |  |  | | | |  | | | |  | | |  | | | | |
 | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — |
 | — | 4:59 | — | — | 4:58 | — | — | 4:55 | — | — | 4:54 | — | — | 4:53 | — | — | 4:52 | — | — | 4:52 | — |
mm | — | — | — | — | — | 1 | 10 | 9 | 2 | — | 1 | — | 1 | — | 1 | 2 | — | — | — | — | — |
Temp °C | 21 | 18 | 17 | 18 | 19 | 19 | 17 | 16 | 18 | 19 | 19 | 20 | 19 | 19 | 23 | 23 | 21 | 21 | 17 | 18 | 14 |
Feels °C | 15 | 14 | 14 | 15 | 17 | 18 | 15 | 13 | 20 | 19 | 20 | 20 | 18 | 19 | 20 | 22 | 20 | 21 | 14 | 14 | 8 |
Swell 1 Height (m) Direction Period (s) | SSE 13 | S 14 | S 14 | S 13 | S 13 | SSW 13 | SE 8 | SSE 8 | SE 7 | SSW 12 | S 6 | SSW 12 | SSW 11 | SSW 11 | SE 9 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | S 7 |
| kJ | 356 | 432 | 496 | 411 | 202 | 249 | 72 | 74 | 54 | 86 | 12 | 81 | 40 | 22 | 12 | 160 | 163 | 61 | 6 | 5 | 4 |
Swell 2 Height (m) Direction Period (s) | S 15 | S 16 | ESE 10 | SE 9 | SSW 15 | SE 8 | SSW 12 | SSW 14 | SSW 14 | SE 7 | SSW 12 | SE 8 | SE 10 | SE 9 | SSW 10 | SE 10 | SE 9 | SE 11 | SE 11 | SE 11 | SE 11 |
| kJ | 283 | 139 | 9 | 75 | 131 | 33 | 79 | 178 | 163 | 24 | 55 | 10 | 15 | 13 | 9 | 4 | 3 | 5 | 5 | 5 | 5 |
Swell 3 Height (m) Direction Period (s) | SSW 7 | SE 10 | ESE 9 | SSW 16 | SE 8 | — | SW 14 | — | SW 17 | SW 15 | SE 8 | — | — | S 15 | — | — | — | S 9 | S 8 | S 8 | SE 8 |
| kJ | 51 | 45 | 49 | 226 | 23 | — | 92 | — | 46 | 33 | 15 | — | — | 4 | — | — | — | 2 | 1 | 1 | 2 |
Wind waves Height (m) Direction Period (s) | — | ENE 3 | E 3 | NE 3 | — | — | — | NNE 3 | — | — | — | — | — | — | — | SSW 8 | — | NE 3 | NNE 3 | — | NNE 2 |
| kJ | — | 3 | 5 | 7 | — | — | — | 1 | — | — | — | — | — | — | — | 408 | — | 4 | 2 | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 51 | 142 | 12 | 0 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 38 | 76 | 14 | 0 | 0 | 90 | 51 | 51 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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.
Nearest