Surf Forecasts:
Rock Island surf forecast from 24 Jul 2026:
- Best quality surf: Monday 27 Jul, 3AM (local time) - 1ft (0.3m), 10s period, SE swell with offshore winds.
- Most powerful swell: Tuesday 28 Jul, 9AM (local time) - 1.5ft (0.4m), 9s period, S swell with 24 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 3AM (local time) - 1ft (0.3m), 10s 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 Monday (Jul 27) at 3AM. The primary swell is predicted to be 0.2m and 14s period with a secondary swell of 0.3m and 9s. Another secondary swell of 0.3m and 10s is also forecast. 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 0.4m 9s and forecast to arrive on Tuesday (Jul 28) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Monday (Jul 27) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 27th Jul) | 1ft (0.3m) 10s |
| Best Surf | 3AM (Mon 27th Jul) | 1ft (0.3m) 10s |
| Most Powerful | 9AM (Tue 28th Jul) | 1.5ft (0.4m) 9s |
Table - best surf conditions forecast for Rock Island over the next 16 days.
The Lowdown
Alright, Rusty here. Let's take a look at what's on the table for the Rock Island area.
Straight up, we've got a long, dry spell ahead. The first week and a half is pretty much a write-off for any decent surf. We're looking at tiny, weak waves with poor conditions until we get into the start of August. The water is sitting at a touch warmer than normal for the time of year, about 81°.
The first real sign of life doesn't come until Monday, August 5th. That morning, a solid groundswell from the SE is pushing through with 3ft faces and a very long 16-second period. The combined energy is strong at 549, and it's wrapping in with a fresh offshore wind from the NE. That's clean, lined-up surf, but with that long period, you'll want to be at a reef or point break to get the best out of it. This is a standout for the more experienced crew.
Tuesday, August 6th, the swell builds. Thursday morning we're looking at 5ft from the SE with a 17-second period, and the energy jumps to 1453. The wind is a fresh offshore from the NNE, so it's going to be clean and powerful. This is big, solid groundswell—over 5ft, so it's not for beginners, and the size is pushing expert territory.
The real daddy of the forecast hits on Friday, August 7th, and Saturday, August 8th. Friday morning sees 10ft SE swell with an 18-second period, and the energy is massive at 5274. It's still offshore from the NNE, so conditions are clean. Saturday ramps it up even more: 13ft from the SSE, with a 17-second period and energy readings over 10,000. That's a very strong, powerful swell. The wind is cross-off, so it'll be clean, but this is expert-only, big-wave territory. The setup at Rock Island, being a reef exposed to the south, is going to handle this swell well, but it's not for the faint of heart.
So, to sum it up: the first week and a half is a bust. The standout is the entire period from Monday, August 5th, through to Saturday, August 8th. The best of the best is likely Friday and Saturday, August 7th and 8th, with the biggest, most powerful groundswell of the window, but be ready for a serious session. Long-range, so keep an eye on it, but it's looking like a good one.
Rusty.
Short Range ForecastHeavy rain (total 27mm), heaviest during Sat night. Warm (max 30°C on Sat morning, min 23°C on Sun night). Winds increasing (calm on Fri night, fresh winds from the NE by Sun night). | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Tue night. Warm (max 28°C on Mon afternoon, min 23°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Fri 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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) | S 7 | SE 11 | SE 10 | SE 10 | SSE 15 | SE 15 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | S 9 | SE 10 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 17 | 18 | 15 | 15 | 22 | 8 | 18 | 20 | 16 | 16 | 16 | 24 | 15 | 14 | 14 | 13 | 13 | 6 | 5 | 5 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross-off | on | cross-off | cross-off | on | on | off | cross-off | cross-off | cross-off | cross-on | cross | cross-off | cross-on | glassy | cross-on | on | on |
High Tide | 11:30PM1.38m | 3:34PM1.21m | 00:29AM1.39m | 4:34PM1.30m | 1:35AM1.40m | 5:13PM1.37m | 2:38AM1.44m | 5:46PM1.42m | 3:36AM1.48m | 6:14PM1.45m | 4:28AM1.51m | 6:41PM1.46m | ||||||||
Low Tide | 5:30PM1.04m | 7:33AM0.35m | 7:05PM1.13m | 8:36AM0.25m | 8:38PM1.16m | 9:30AM0.16m | 9:45PM1.13m | 10:17AM0.10m | 10:34PM1.08m | 11:00AM0.06m | 11:15PM1.00m | 11:39AM0.07m | 11:52PM0.91m | |||||||
 |  | |  | | |  | | | |  |  | |  | | |  | | | | |
 | — | — | 4:43 | — | — | 4:45 | — | — | 4:46 | — | — | 4:46 | — | — | 4:47 | — | — | 4:48 | — | — |
 | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — |
mm | — | 2 | — | 1 | 10 | 2 | 4 | 8 | — | — | — | — | — | 5 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 30 | 30 | 25 | 25 | 26 | 27 | 27 | 28 | 24 | 25 | 26 | 25 | 26 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 30 | 32 | 34 | 33 | 27 | 27 | 28 | 32 | 27 | 28 | 25 | 28 | 28 | 29 | 28 | 30 | 30 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SE 11 | SE 10 | SE 10 | SE 10 | SE 15 | SE 11 | S 9 | SSW 8 | SSW 8 | SSW 8 | S 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 |
| kJ | 8 | 18 | 15 | 15 | 15 | 8 | 18 | 14 | 14 | 14 | 14 | 24 | 15 | 14 | 14 | 13 | 13 | 6 | 5 | 5 |
Swell 2 Height (m) Direction Period (s) | SE 17 | S 7 | SE 16 | SE 16 | SSE 15 | SE 11 | SE 15 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SSE 6 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 |
| kJ | 11 | 4 | 10 | 10 | 22 | 5 | 8 | 18 | 16 | 16 | 16 | 15 | 15 | 4 | 3 | 3 | 3 | 3 | 3 | 4 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 16 | S 7 | S 7 | S 8 | S 7 | S 9 | SSE 14 | SE 14 | SE 14 | SE 13 | SE 13 | SE 13 | SSE 4 | SE 10 | SE 12 | SE 12 | SE 12 | SE 8 | S 8 |
| kJ | 5 | 10 | 1 | 1 | 1 | 4 | 2 | 20 | 8 | 8 | 7 | 7 | 7 | 2 | 4 | 6 | 6 | 6 | 3 | 1 |
Wind waves Height (m) Direction Period (s) | S 7 | — | — | S 2 | — | — | S 2 | SSE 3 | NE 3 | — | ESE 3 | E 3 | — | — | NE 3 | ENE 2 | — | — | — | S 3 |
| kJ | 17 | — | — | 1 | — | — | 1 | 1 | 2 | — | 2 | 1 | — | — | 2 | 1 | — | — | — | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 77 | 38 | 16 | 51 | 51 | 16 | 77 | 7 | 487 | 38 | 51 | 51 | 51 | 55 | 61 | 51 | 16 | 55 | 76 | 76 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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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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