Surf Forecasts:
Rock Island surf forecast from 9 Oct 2026:
- Best quality surf: Monday 12 Oct, 3AM (local time) - 2ft (0.6m), 16s period, SE swell with offshore winds.
- Most powerful swell: Monday 12 Oct, 6AM (local time) - 2.5ft (0.7m), 15s period, SE swell with 209 kJ wave energy.
- Next surfable swell (1★+): Friday 9 Oct, 9PM (local time) - 2.5ft (0.7m), 8s period with ESE 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 09) at 9PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.4m and 8s. Another secondary swell of 0.3m and 16s is also forecast. 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 0.7m 15s and forecast to arrive on Monday (Oct 12) at 6AM. 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 (Oct 12) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 9th Oct) | 2.5ft (0.7m) 8s |
| Best Surf | 3AM (Mon 12th Oct) | 2ft (0.6m) 16s |
| Most Powerful | 6AM (Mon 12th Oct) | 2.5ft (0.7m) 15s |
Table - best surf conditions forecast for Rock Island over the next 16 days.
Short Range ForecastMostly dry. Warm (max 25°C on Sun afternoon, min 19°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Wed afternoon, min 18°C on Mon night). Winds decreasing (fresh winds from the ENE on Mon afternoon, light winds from the S by Tue afternoon). | ||||||||||||||||||||
Friday 9 | Saturday 10 | Sunday 11 | Monday 12 | Tuesday 13 | Wednesday 14 | Thursday 15 | |||||||||||||||
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) | ESE 18 | ESE 17 | ESE 15 | ESE 14 | ESE 13 | SE 12 | ESE 12 | ESE 11 | SE 15 | SE 14 | SE 14 | SE 13 | SE 13 | SE 12 | SE 11 | SE 9 | SSW 4 | ESE 8 | ESE 8 | E 14 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 64 | 57 | 43 | 75 | 111 | 152 | 93 | 81 | 109 | 206 | 198 | 166 | 158 | 141 | 40 | 13 | 12 | 7 | 7 | 4 | 12 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | off | off | cross-off | off | off | cross-off | off | off | cross-off | off | off | cross-off | on | cross-on | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 4:00PM1.43m | 4:06AM1.47m | 4:24PM1.46m | 4:53AM1.53m | 4:47PM1.49m | 5:38AM1.56m | 5:11PM1.51m | 6:22AM1.55m | 5:35PM1.53m | 7:07AM1.52m | 6:00PM1.54m | 7:54AM1.46m | 6:27PM1.53m | ||||||||
Low Tide | 9:38AM0.50m | 10:01PM0.62m | 10:19AM0.54m | 10:35PM0.47m | 10:55AM0.60m | 11:09PM0.34m | 11:29AM0.68m | 11:43PM0.24m | 12:00PM0.77m | 00:19AM0.18m | 12:31PM0.87m | 00:57AM0.15m | 1:03PM0.96m | 1:38AM0.17m | |||||||
 | |  | | | | | | | | | | | |  |  | |  |  | | | |
 | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — |
 | — | 5:15 | — | — | 5:14 | — | — | 5:13 | — | — | 5:10 | — | — | 5:09 | — | — | 5:08 | — | — | 5:07 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 23 | 21 | 22 | 24 | 21 | 22 | 25 | 21 | 22 | 23 | 20 | 22 | 23 | 21 | 24 | 25 | 22 | 18 | 19 | 19 |
Feels °C | 21 | 23 | 20 | 20 | 21 | 19 | 20 | 23 | 18 | 19 | 19 | 17 | 20 | 22 | 20 | 23 | 25 | 19 | 14 | 17 | 17 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 8 | ESE 15 | ESE 14 | ESE 13 | SE 12 | ESE 12 | ESE 11 | SE 15 | SE 14 | SE 14 | SE 13 | SE 13 | SE 12 | SE 11 | SE 9 | ESE 9 | SSW 4 | ESE 8 | SE 8 | SE 8 |
| kJ | 20 | 18 | 43 | 75 | 111 | 152 | 93 | 81 | 109 | 206 | 198 | 166 | 158 | 141 | 40 | 13 | 8 | 2 | 7 | 3 | 3 |
Swell 2 Height (m) Direction Period (s) | ESE 18 | ESE 17 | SE 8 | SE 8 | S 9 | S 9 | — | SE 18 | SE 11 | E 10 | E 9 | E 8 | E 8 | E 8 | E 9 | ESE 10 | — | ESE 8 | — | E 14 | E 8 |
| kJ | 64 | 57 | 10 | 9 | 2 | 2 | — | 13 | 29 | 8 | 6 | 32 | 35 | 34 | 24 | 10 | — | 7 | — | 4 | 12 |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 11 | SE 11 | SE 10 | — | — | S 9 | SE 15 | S 8 | — | — | — | — | — | — | — | — | SW 4 | — | ENE 12 | E 14 |
| kJ | 5 | 5 | 5 | 4 | — | — | 1 | 8 | 1 | — | — | — | — | — | — | — | — | 3 | — | 27 | 4 |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 2 | NE 2 | NE 2 | NNE 3 | NE 2 | NE 2 | NE 3 | NE 3 | NE 3 | NNE 3 | — | — | — | SSW 4 | N 3 | NE 3 | NE 3 | NNE 3 |
| kJ | — | — | — | 1 | 1 | 2 | 1 | 1 | 1 | 3 | 4 | 4 | 3 | — | — | — | 12 | 4 | 5 | 5 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 38 | 4 | 2 | 0 | 38 | 228 | 16 | 249 | 514 | 552 | 55 |
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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