Surf Forecasts:
Shichirigahama surf forecast from 20 Aug 2026:
- Best quality surf: Monday 24 Aug, 9AM (local time) - 4.5ft (1.3m), 16s period, SSE swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 3AM (local time) - 11ft (3.5m), 12s period, S swell with 3,541 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 3AM (local time) - 3.5ft (1.1m), 15s period with SSE swell.
Best Forecast Surf Conditions for Shichirigahama this week:
The surf forecast for Shichirigahama over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 24) at 3AM. The primary swell is predicted to be 1.1m and 15s period with a secondary swell of 0.3m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Shichirigahama in the next 16 days are 3.5m 12s and forecast to arrive on Thursday (Aug 27) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 24th Aug) | 3.5ft (1.1m) 15s |
| Best Surf | 9AM (Mon 24th Aug) | 4.5ft (1.3m) 16s |
| Most Powerful | 3AM (Thu 27th Aug) | 11ft (3.5m) 12s |
Table - best surf conditions forecast for Shichirigahama over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what’s on the menu for the Shichigahama region over the next couple of weeks.
To be straight with you, the first several days are a bit of a write-off. We’ve got tiny little ankle-snappers from the 20th right through the 23rd of August, with swell heights barely reaching 1 feet. The wind is all over the place, and the combined wave energy is weak (14 to 88). You’d be better off doing something else. It’s not until Monday the 24th that things start to look interesting.
That Monday morning, the 24th of August, is where we get our standout moment. The swell jumps up to 4 feet from the SSE, with a very long period of 16 seconds – that’s proper groundswell energy. The combined energy is strong (1389), and the wind is glassy, so the surface will be smooth as silk. This is excellent surf for experienced surfers. The only spot on offer is Shichirigahama, a river mouth that is inconsistent and can get crowded sometimes, but with these conditions, it’ll be worth the gamble. The water temperature is a warm 80°, which is about average for the time of year.
Now, the afternoon of the 24th gets ruined by strong onshore winds, and Tuesday the 25th sees the swell building to 7 feet, but again the wind is messy. The energy is very strong (2376), but the conditions are marginal at best. Wednesday the 26th and Thursday the 27th are a washout with heavy rain and strong cross-onshore winds, and the swell gets up to a messy 10 feet – that’s expert-only territory, and the wind will tear it apart.
Heading into the end of August and the first days of September, we see a gradual drop in swell. From the 28th to the 30th, there are some small windows with offshore winds, but the swell is dropping fast (from 7 feet down to 3 feet), and the energy is moderate (299 to 176). It’s surfable but ordinary. The 31st of August and the 1st of September see some consistent offshore winds with moderate energy (around 230) and 2-2 feet swell, but the waves are pretty weak. Not a second standout.
After the 2nd of September, it fizzles out completely. The swell drops below 2 feet, energy falls below 100, and we’re back to flat spells through to the 4th of September.
So, to sum it up: the only real shot at a good wave is the morning of Monday the 24th of August. Get on it early. Everything else is either too small, too windy, or too messy. It’s a long gap between now and then, and another dry spell after.
Stay stoked,
Rusty
Short Range ForecastModerate rain (total 10mm), heaviest on Sat night. Warm (max 27°C on Thu afternoon, min 24°C on Sat night). Winds decreasing (fresh winds from the SSW on Fri afternoon, calm by Sat night). | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Wed morning. Warm (max 28°C on Tue afternoon, min 23°C on Wed morning). Winds decreasing (fresh winds from the S on Tue afternoon, calm by Wed morning). | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 9 | S 10 | SSW 9 | S 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSW 9 | SE 16 | SSE 15 | SSE 16 | SSE 15 | SSE 15 | S 15 | S 16 | S 14 | S 13 | S 12 | S 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 8 | 8 | 27 | 101 | 35 | 32 | 32 | 20 | 15 | 61 | 372 | 859 | 869 | 1951 | 2293 | 2562 | 2391 | 1497 | 1065 | 3538 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | glassy | cross-on | glassy | off | cross-on | cross | glassy | on | on | on | on | on | on | cross-on | cross-on |
High Tide | 8:44PM1.45m | 9:20PM1.38m | 5:30PM1.29m | 10:31PM1.31m | 4:48PM1.36m | 00:49AM1.28m | 4:54PM1.41m | 2:21AM1.33m | 5:05PM1.44m | 3:19AM1.40m | 5:16PM1.46m | |||||||||
Low Tide | 4:58AM0.51m | 6:47AM0.47m | 7:34PM1.28m | 8:09AM0.39m | 9:21PM1.20m | 9:06AM0.32m | 9:56PM1.11m | 9:48AM0.27m | 10:20PM1.01m | 10:23AM0.25m | 10:42PM0.89m | |||||||||
 |  |  | |  | | |  | |  | |  | | | | |  |  |  |  | |
 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — |
 | 6:25 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — |
mm | — | — | — | — | — | — | — | 10 | — | 1 | 3 | — | — | — | — | — | 1 | 8 | 34 | 43 |
Temp °C | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 28 | 27 | 24 | 23 | 26 |
Feels °C | 29 | 27 | 28 | 27 | 27 | 31 | 29 | 31 | 28 | 30 | 30 | 30 | 28 | 27 | 30 | 28 | 28 | 26 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 8 | SSW 9 | SE 11 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSW 9 | SE 16 | SSE 15 | SSE 16 | SSE 15 | SSE 15 | S 15 | S 16 | S 14 | S 13 | S 12 | E 12 |
| kJ | 8 | 6 | 27 | 4 | 35 | 32 | 32 | 20 | 15 | 61 | 372 | 859 | 869 | 1951 | 2293 | 2562 | 2391 | 1497 | 1065 | 11 |
Swell 2 Height (m) Direction Period (s) | SE 11 | S 10 | SE 11 | S 9 | SE 10 | S 4 | SE 10 | SE 10 | S 5 | SSW 8 | SSW 8 | SSE 19 | SSE 18 | ESE 15 | ESE 14 | ESE 13 | ESE 13 | SSE 9 | E 12 | E 15 |
| kJ | 4 | 8 | 4 | 2 | 4 | 6 | 4 | 4 | 2 | 14 | 14 | 517 | 817 | 42 | 66 | 35 | 33 | 148 | 25 | 17 |
Swell 3 Height (m) Direction Period (s) | E 6 | SE 11 | SE 5 | S 13 | S 9 | SE 10 | SE 11 | SE 11 | SE 10 | SSE 10 | E 13 | SSW 8 | SSW 9 | E 15 | SW 10 | SW 10 | SW 11 | E 12 | E 17 | — |
| kJ | 1 | 4 | 4 | 3 | 2 | 4 | 5 | 5 | 4 | 9 | 12 | 13 | 7 | 38 | 17 | 16 | 18 | 26 | 5 | — |
Wind waves Height (m) Direction Period (s) | SSE 2 | SSW 3 | SSW 3 | S 9 | SSW 4 | — | S 5 | S 5 | — | SSE 4 | — | — | SSW 10 | SW 9 | — | — | — | — | SE 10 | S 12 |
| kJ | 1 | 3 | 2 | 101 | 11 | — | 10 | 11 | — | 4 | — | — | 52 | 30 | — | — | — | — | 200 | 3538 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 80 | 80 | 80 | 81 | 89 | 22 | 81 | 59 | 54 | 42 | 3 | 0 | 81 | 10 | 80 | 487 | 10 | 10 | 81 | 562 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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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.
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