Surf Forecasts:
Shichirigahama surf forecast from 17 Aug 2026:
- Most powerful swell: Monday 24 Aug, 9PM (local time) - 6ft (1.8m), 8s period, SW swell with 358 kJ wave energy.
Best Forecast Surf Conditions for Shichirigahama this week:
The most powerful waves expected at Shichirigahama in the next 16 days are 1.8m 8s and forecast to arrive on Monday (Aug 24) at 9PM. 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+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9PM (Mon 24th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Shichirigahama over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's cooking for Shichigahama.
Right, let's be straight with you. The first week or so is looking pretty grim. We've got a real flat spell on our hands from now all the way through to the 23rd of August. There's nothing worth paddling out for; just tiny wind chop and poor conditions. You'd be better off cleaning the wax off your deck or going for a fish. It's a long, frustrating gap, but that's the way it is.
The first sniff of something real arrives on the morning of Monday the 25th of August. The swell is still tiny, just a 2ft groundswell pushing in from the SE, but the wind goes glassy calm. It's rideable but ordinary. Not the one to set the alarm for.
Now, here's where it gets interesting. The standout window is from Wednesday the 26th through to Friday the 28th of August. This is the best the forecast has to offer, and it's a proper big-wave event for experienced surfers only.
The star of the show is Shichigahama itself, a river break where consistent, long-period groundswell from the SSE is going to light it up. We're looking at waves building from 6ft on Wednesday morning to a solid 8ft on Thursday and peaking at a hefty 10ft on Friday. The swell energy is massive, hitting values like 1688 and climbing to a thumping 4355. This isn't for the faint-hearted; over 8ft, this is expert territory. The period is a very long 16 seconds, so these are proper, powerful lines. At a river mouth, this kind of long-period energy can set up some beautiful, walling rights and lefts. The wind plays ball beautifully, too. Wednesday morning has a light cross-offshore breeze from the east, making for clean, peeling faces. Then on Thursday, we get a proper offshore wind from the NNE, holding those 7ft to 8ft faces open for some deep barrels. It's going to be absolutely pumping, but also a serious challenge. Expect a crew, as crowds are sometimes a factor here.
Saturday the 29th is a write-off. The same massive 10ft swell is there, but a severe gale from the SSE blows it to pieces. That's kite-surfing weather, not surfing.
The energy settles by early September. Monday the 31st of August and Tuesday the 1st of September see the size drop to a much friendlier 3ft to 3ft, but with clean offshore winds again from the NE. It's a nice little window for a longboard or a fish after the chaos of the big days, but the real magic is that mid-week giant swell with the offshore winds.
So, to sum it up: sit tight through the flat spell. Your target is Wednesday the 26th through Friday the 28th of August for a big, expert-level swell with clean winds. That's the only real standout on offer.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Mon afternoon, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Sun morning. Warm (max 27°C on Thu afternoon, min 24°C on Sun morning). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 7 | SE 6 | SE 6 | SSW 8 | SSE 6 | SSW 9 | S 10 | S 9 | S 10 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | S 4 | SSW 5 |
Wave Graph | ||||||||||||||||||||
14 | 7 | 6 | 6 | 7 | 6 | 6 | 6 | 4 | 17 | 50 | 44 | 54 | 101 | 57 | 55 | 35 | 32 | 36 | 86 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | cross | on | glassy | glassy | on | on | cross | on | on | cross-on | on | on | on | on | on | cross-on | on | on |
High Tide | 7:19PM1.55m | 7:52AM1.34m | 7:45PM1.54m | 8:48AM1.21m | 8:14PM1.50m | 10:09AM1.09m | 8:44PM1.45m | 9:20PM1.38m | 5:30PM1.29m | 10:31PM1.31m | 4:48PM1.36m | 00:49AM1.28m | ||||||||
Low Tide | 1:41AM0.48m | 1:24PM0.69m | 2:29AM0.47m | 1:44PM0.84m | 3:29AM0.49m | 1:48PM0.98m | 4:58AM0.51m | 6:47AM0.47m | 7:34PM1.28m | 8:09AM0.39m | 9:21PM1.20m | |||||||||
— | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | |
6:29 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 4 | 1 | 11 |
Temp °C | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 25 | 24 | 25 |
Feels °C | 29 | 30 | 30 | 29 | 29 | 30 | 28 | 29 | 30 | 29 | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 27 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SSE 6 | SSE 6 | SSE 6 | SE 7 | SE 6 | SE 6 | SSE 6 | SE 10 | SSW 9 | S 10 | S 9 | S 10 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSE 10 | SSE 9 |
14 | 3 | 3 | 4 | 7 | 6 | 6 | 3 | 4 | 17 | 50 | 44 | 46 | 101 | 57 | 55 | 35 | 32 | 9 | 8 | |
Swell 2 Height (m) Direction Period (s) | SE 11 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SSE 6 | SE 11 | SE 11 | SSW 12 | SSW 12 | SE 10 | S 4 | SE 10 | SE 10 | SSE 10 | SE 11 | E 10 |
4 | 7 | 6 | 6 | 6 | 4 | 4 | 4 | 3 | 4 | 4 | 15 | 54 | 4 | 2 | 4 | 4 | 10 | 5 | 2 | |
Swell 3 Height (m) Direction Period (s) | E 8 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 8 | SW 8 | SSW 8 | SW 8 | SE 6 | S 9 | SE 11 | SE 10 | SE 9 | SSE 10 | SE 11 | SE 11 | SE 10 | E 10 | E 12 |
1 | 4 | 4 | 4 | 4 | 6 | 3 | 6 | 2 | 1 | 1 | 4 | 4 | 3 | 11 | 4 | 5 | 4 | 7 | 3 | |
Wind waves Height (m) Direction Period (s) | SSE 5 | — | — | — | — | — | — | — | — | SSE 2 | SSE 6 | SSE 5 | S 3 | S 3 | — | S 3 | SSW 3 | SSW 3 | S 4 | SSW 5 |
3 | — | — | — | — | — | — | — | — | 1 | 3 | 3 | 4 | 6 | — | 2 | 3 | 3 | 36 | 86 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 22 | 54 | 54 | 54 | 54 | 78 | 81 | 81 | 142 | 22 | 58 | 54 | 81 | 10 | 81 | 81 | 81 | 22 | 64 | 90 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Information about the Shichirigahama Surf forecast
The above surf forecast table for Shichirigahama provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Shichirigahama can be found by selecting the local surf guide option on the grey menu. Our Shichirigahama 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 (Shichirigahama) 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 Shichirigahama 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.
Shichigahama is 6 km (4 miles) from the city of Chigasaki. If you plan a holiday in Kanagawa, look for hotels and other accommodation in Chigasaki. Chigasaki has rooms for a wide range of budgets as well as car hire and transport links.











