
Surf Forecasts:
Rock Island surf forecast from 5 Jul 2026:
- Best quality surf: Wednesday 8 Jul, 6AM (local time) - 3.5ft (1.0m), 18s period, SSE swell with cross-offshore winds.
- Most powerful swell: Saturday 11 Jul, 3AM (local time) - 7ft (2.2m), 18s period, SSW swell with 2,942 kJ wave energy.
- Next surfable swell (1★+): Monday 6 Jul, 9PM (local time) - 2ft (0.6m), 13s period with SSE 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 06) at 9PM. The primary swell is predicted to be 0.6m and 13s period with a secondary swell of 0.5m and 7s. 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 2.2m 18s and forecast to arrive on Saturday (Jul 11) at 3AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 6th Jul) | 2ft (0.6m) 13s |
| Best Surf | 6AM (Wed 8th Jul) | 3.5ft (1.0m) 18s |
| Most Powerful | 3AM (Sat 11th Jul) | 7ft (2.2m) 18s |
Table - best surf conditions forecast for Rock Island over the next 16 days.
Updates in hr min s Forecast update imminent
Alright folks, Rusty here. Let’s have a look at what’s coming up for Rock Island.
We’re in for a bit of a mixed bag over the next couple of weeks. There’s some real potential, especially for the experienced crew, but you’ll have to pick your moments and watch the wind. The water is sitting at 74°F, which is just about normal for this time of year, so nothing wild there.
The real standout of the whole period is going to be Wednesday, July 8. We’ve got a solid southerly groundswell pushing in with very long 17-second period and a strong amount of energy pushing through. The morning is looking clean with a light cross-offshore breeze, and waves around 5ft. That’s a proper reef break setup, and with that period, it’ll be lining up beautifully. But listen, this one is for experienced surfers only. Anything over 8ft would be expert territory, and 5ft on a long-period swell at a reef can pack a punch. The afternoon on Wednesday does get a bit lumpy with a cross-onshore wind and the swell pushing 6ft, so the early session is the one to chase. Crowds are sometimes an issue here, but on a Wednesday you might get a bit more room.
Before that, Tuesday, July 7, is worth a paddle too. The swell is a little smaller, around 2ft to 3ft, but that long 15-second period and proper offshore wind from the NNE in the morning will make for glassy, clean conditions. It’ll be a fun session for all levels. The afternoon cleans up even more with a light cross-off breeze.
Now, from Thursday, July 9, through to the end of the first week, things get tricky. The swell size jumps up to 6ft to 7ft, and even hits 7ft on Saturday morning, but the wind swings onshore and stays there. S out of the south, right on the nose most of the time, with speeds up to 19 mph. That’s going to chop things up and make it a real battle. The energy is still high, but with that wind, it’s not worth the effort for a paddle surfer.
There’s a long gap after that, from around Sunday, July 12, right through until Saturday, July 18. The swell drops right off, the onshore wind keeps blowing, and we get a string of poor surf days. It’s a proper lull.
Finally, there’s a little glimmer on Saturday, July 18, and Sunday, July 19. We’re looking at tiny waves, just 1ft to 2ft, but Saturday morning and afternoon are glassy – dead calm wind, and that’s rare. It’s not going to be epic, just surfable little waves, but if you need a fix and the tide lines up, it’ll be clean. Sunday morning has a light offshore, but the swell is tiny.
So there you have it. The real standout is Wednesday the 8th, first light. Get on it if you can handle the reef. The rest of the window is mostly a write-off, but keep an eye on that glassy Saturday.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon morning. Warm (max 26°C on Tue afternoon, min 21°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Thu afternoon, min 23°C on Thu morning). Winds increasing (light winds from the SSE on Thu morning, fresh winds from the S by Sat afternoon). | ||||||||||||||||||||
Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | |||||||||||||||
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) | SE 7 | SE 7 | SSE 14 | SSE 15 | SSE 15 | SSE 14 | SSE 17 | SSE 16 | SSE 15 | S 15 | S 16 | S 15 | S 16 | S 16 | SSW 16 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 13 |
Wave Graph | |||||||||||||||||||||
89 | 77 | 138 | 201 | 443 | 328 | 1532 | 1631 | 1364 | 1280 | 1551 | 1492 | 1857 | 2062 | 1455 | 2635 | 2084 | 1245 | 941 | 487 | 198 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | off | off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on |
High Tide | 9:50PM1.36m | 9:44AM1.18m | 10:23PM1.35m | 11:09AM1.11m | 11:00PM1.35m | 12:55PM1.10m | 11:41PM1.36m | 2:42PM1.15m | 00:30AM1.37m | 4:01PM1.24m | 1:22AM1.40m | 4:55PM1.32m | 2:17AM1.43m | ||||||||
Low Tide | 3:07PM0.44m | 4:01AM0.69m | 3:48PM0.60m | 5:04AM0.60m | 4:34PM0.76m | 6:12AM0.50m | 5:31PM0.91m | 7:19AM0.39m | 6:45PM1.02m | 8:19AM0.28m | 8:06PM1.09m | 9:13AM0.17m | 9:17PM1.11m | ||||||||
4:31 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:35 | — | — | 4:35 | — | — | |
— | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:58 | — | |
mm | 2 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 |
Temp °C | 23 | 23 | 22 | 25 | 26 | 23 | 24 | 25 | 23 | 24 | 25 | 24 | 24 | 25 | 24 | 24 | 24 | 23 | 24 | 24 | 24 |
Feels °C | 25 | 25 | 23 | 24 | 26 | 24 | 26 | 27 | 24 | 25 | 25 | 25 | 25 | 25 | 24 | 23 | 22 | 22 | 22 | 21 | 25 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | SSE 7 | SSE 14 | SSE 15 | SSE 15 | SSE 14 | SSE 17 | SSE 16 | SSE 15 | S 15 | S 16 | S 15 | S 16 | S 16 | SSW 16 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 13 |
31 | 31 | 138 | 201 | 443 | 328 | 1532 | 1631 | 1364 | 1280 | 1551 | 1492 | 1857 | 2062 | 1455 | 2635 | 2084 | 1245 | 941 | 487 | 198 | |
Swell 2 Height (m) Direction Period (s) | SE 15 | SE 14 | SE 7 | SE 12 | SSE 20 | SSE 18 | — | S 18 | — | ESE 8 | ESE 8 | ESE 9 | ESE 8 | ESE 8 | SSW 18 | — | — | — | SE 14 | SE 11 | SSW 12 |
54 | 70 | 16 | 67 | 75 | 190 | — | 801 | — | 38 | 44 | 25 | 28 | 22 | 969 | — | — | — | 8 | 29 | 28 | |
Swell 3 Height (m) Direction Period (s) | SW 6 | SSE 16 | S 7 | SE 7 | — | SSE 16 | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 9 | SE 10 |
2 | 27 | 1 | 11 | — | 102 | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | 4 | |
Wind waves Height (m) Direction Period (s) | SE 7 | SE 7 | — | — | ESE 7 | — | — | — | — | — | — | — | — | — | — | — | — | S 3 | — | S 4 | SSW 4 |
89 | 77 | — | — | 38 | — | — | — | — | — | — | — | — | — | — | — | — | 6 | — | 13 | 13 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 64 | 7 | 0 | 0 | 0 | 0 | 0 | 38 | 14 | 6 | 64 | 14 | 18 | 77 | 76 | 76 | 77 | 38 | 14 | 77 | 14 |
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.










