Surf Forecasts:
Rock Island surf forecast from 12 Nov 2026:
- Best quality surf: Saturday 21 Nov, 9PM (local time) - 5ft (1.5m), 6s period, SW swell with offshore winds.
- Most powerful swell: Thursday 19 Nov, 3PM (local time) - 6ft (1.9m), 10s period, SW swell with 738 kJ wave energy.
- Next surfable swell (1★+): Wednesday 18 Nov, 3AM (local time) - 3.5ft (1.1m), 8s period with SE 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 Wednesday (Nov 18) at 3AM. The primary swell is predicted to be 1.1m and 8s period. 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 1.9m 10s and forecast to arrive on Thursday (Nov 19) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Nov 17) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Wed 18th Nov) | 3.5ft (1.1m) 8s |
| Best Surf | 9PM (Sat 21st Nov) | 5ft (1.5m) 6s |
| Most Powerful | 3PM (Thu 19th Nov) | 6ft (1.9m) 10s |
Table - best surf conditions forecast for Rock Island over the next 16 days.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun morning. Very mild (max 17°C on Thu night, min 13°C on Sun morning). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 26mm), heaviest during Wed afternoon. Warm (max 20°C on Wed afternoon, min 9°C on Tue afternoon). Winds increasing (light winds from the NE on Sun night, near gales from the S by Wed afternoon). | ||||||||||||||||||
Friday 13 | Saturday 14 | Sunday 15 | Monday 16 | Tuesday 17 | Wednesday 18 | ||||||||||||||
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 9 | SW 4 | E 10 | S 5 | ESE 8 | SE 11 | SE 9 | S 6 | S 6 | S 6 | S 7 | S 7 | S 7 | SE 6 | SE 8 | SSE 8 | SE 9 | SE 9 | SW 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 8 | 15 | 3 | 4 | 6 | 4 | 3 | 28 | 18 | 11 | 26 | 38 | 15 | 8 | 29 | 117 | 190 | 120 | 478 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-off | off | off | glassy | glassy | glassy | glassy | off | off | off | cross-off | off | off | off | off | on | cross-on |
High Tide | 7:57AM1.45m | 5:56PM1.51m | 8:46AM1.41m | 6:32PM1.47m | 9:38AM1.36m | 7:15PM1.40m | 10:33AM1.33m | 8:11PM1.30m | 11:28AM1.32m | 9:31PM1.21m | 12:17PM1.31m | 11:19PM1.15m | |||||||
Low Tide | 00:40AM0.03m | 12:47PM1.05m | 1:21AM0.06m | 1:28PM1.08m | 2:05AM0.13m | 2:20PM1.10m | 2:54AM0.23m | 3:27PM1.08m | 3:49AM0.35m | 4:53PM1.02m | 4:52AM0.47m | 6:17PM0.91m | |||||||
 |  | |  |  |  |  |  | | | | |  | |  |  |  | |  | |
 | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | — | 4:37 | — | — | 4:36 | — | — | 4:36 | — | — | 4:35 | — | — | 4:35 | — | — | 4:34 | — |
mm | — | — | — | — | — | — | — | 2 | — | — | — | — | 1 | 3 | 7 | 6 | 1 | 8 | 5 |
Temp °C | 17 | 16 | 17 | 17 | 17 | 17 | 17 | 15 | 16 | 16 | 16 | 17 | 16 | 12 | 10 | 12 | 15 | 20 | 21 |
Feels °C | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 12 | 12 | 12 | 14 | 15 | 14 | 5 | 3 | 8 | 14 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SW 4 | SSW 4 | S 5 | S 5 | S 5 | SSE 4 | S 6 | S 6 | S 6 | S 7 | S 7 | S 7 | SE 6 | SE 8 | SSE 8 | SE 9 | SE 9 | SSW 8 |
| kJ | 8 | 4 | 2 | 4 | 5 | 2 | 2 | 28 | 18 | 11 | 26 | 38 | 15 | 8 | 29 | 117 | 190 | 120 | 240 |
Swell 2 Height (m) Direction Period (s) | E 8 | SE 8 | SE 8 | SE 8 | SE 11 | SE 11 | — | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 6 | E 10 | — | — | — | SE 9 |
| kJ | 1 | 3 | 3 | 3 | 4 | 4 | — | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 2 | — | — | — | 28 |
Swell 3 Height (m) Direction Period (s) | E 10 | E 11 | E 10 | — | ESE 8 | E 8 | SE 9 | — | — | — | — | — | SE 6 | E 10 | S 6 | — | — | — | — |
| kJ | 2 | 2 | 2 | — | 6 | 1 | 3 | — | — | — | — | — | 8 | 2 | 1 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | — | — | — | — | — | — | — | — | — | — | E 2 | NE 3 | NNE 3 | N 3 | — | — | SW 8 |
| kJ | 3 | 15 | — | — | — | — | — | — | — | — | — | — | 1 | 8 | 9 | 6 | — | — | 478 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 76 | 76 | 76 | 54 | 54 | 54 | 54 | 51 | 18 | 16 | 54 | 38 | 145 | 228 | 552 | 552 | 51 | 38 | 487 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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