
Surf Forecasts:
Sakawa River surf forecast from 3 Aug 2026:
- Best quality surf: Wednesday 5 Aug, 12AM (local time) - 11ft (3.5m), 16s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 5 Aug, 9AM (local time) - 11ft (3.5m), 16s period, SE swell with 5,796 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 12AM (local time) - 11ft (3.5m), 16s period with SE swell.
Best Forecast Surf Conditions for Sakawa River this week:
The surf forecast for Sakawa River over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 05) at 12AM. The primary swell is predicted to be 3.5m and 16s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Sakawa River in the next 16 days are 3.5m 16s and forecast to arrive on Wednesday (Aug 05) 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 0.9m 4s period and expected on Tuesday (Aug 04) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 5th Aug) | 11ft (3.5m) 16s |
| Best Surf | 12AM (Wed 5th Aug) | 11ft (3.5m) 16s |
| Most Powerful | 9AM (Wed 5th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright, Rusty here, checking in on the Sakawa River.
The forecast fires up on Monday the 3rd of August, so no dead time at the start. There’s a big pulse of swell early on, but you’ve got to sift through the conditions. The one to circle is Wednesday morning, the 5th of August. That’s the pick. Swell is a thumping 12ft from the SE, with a very long period of 16 seconds, giving it heavy groundswell energy – the combined energy is a massive 5796 (very strong). The wind is cross-offshore from the NNE, so the waves will be clean. That’s big, powerful stuff, and for the Sakawa River, it’s expert-only territory. It’s a river break, so it can handle that long period, but beginners need to stay clear. The water is a touch warmer than usual at 82°.
Tuesday the 4th of August morning has a solid 8ft swell from the SE, 17-second period, 3783 combined energy, and cross-off wind, but it’s flagged for questionable tide conditions. The afternoon is a mess with onshore wind and 10ft, so skip it. Wednesday afternoon the 5th still has size at 12ft, but the wind turns cross, and the direction shifts to SSE, making it less clean.
By Thursday the 6th of August, the swell drops to 10ft, but the wind is onshore or cross, and the period drops to 14-15 seconds. The combined energy is still strong, but the quality is poor. From Friday the 7th through to the 10th, the swell steadily drops from 8ft down to 3ft, with mostly cross or cross-off winds, but the scores are very low. The surf is just marginal or poor. The 10th of August has a 4ft swell from the ESE with 15 mph cross-off wind, but it’s rated poor.
There’s a dry spell of several days from around the 11th to the 14th, with swell dropping below 3ft. The 12th of August has a tiny 3ft swell with glassy conditions in the morning, and the 12th afternoon is glassy with 3ft, but it’s barely surfable. The 14th of August afternoon has 2ft glassy conditions, but it’s only ordinary.
Then on the 15th of August Saturday afternoon, there’s a sudden spike to 7ft from the ESE with 11-second period, but the wind is cross-onshore and choppy, and the score is zero. Sunday the 16th of August morning has 10ft from the SE with 11 seconds and cross wind, but it’s marginal. The period is short, so it’s not as good as that Wednesday groundswell.
Bottom line: for the experts, lock in Wednesday the 5th of August morning. That’s the one. After that, it’s a long wait with a lot of small, messy, or poor surf. The late spike on the 16th is too rough to bother with.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Warm (max 31°C on Thu morning, min 21°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Fri night. Warm (max 29°C on Thu afternoon, min 25°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 16 | SE 17 | SE 17 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 14 | SSE 14 | S 15 | S 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | ESE 13 |
Wave Graph | ||||||||||||||||||||
1672 | 2794 | 3723 | 4228 | 5341 | 5796 | 5220 | 3651 | 3517 | 3681 | 3277 | 2379 | 1948 | 1399 | 1224 | 926 | 813 | 563 | 468 | 539 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-on | cross-off | cross-off | cross | cross-off | cross | on | cross-off | cross-off | cross | cross | cross-on | on | cross | cross | cross-on | cross-off |
High Tide | 7:41PM1.46m | 7:48AM1.28m | 8:05PM1.45m | 8:47AM1.18m | 8:33PM1.43m | 10:12AM1.09m | 9:05PM1.40m | 12:46PM1.07m | 9:50PM1.36m | 3:24PM1.19m | 11:07PM1.33m | 4:05PM1.31m | 00:49AM1.35m | |||||||
Low Tide | 1:55AM0.55m | 1:44PM0.55m | 2:41AM0.50m | 2:14PM0.72m | 3:38AM0.47m | 2:46PM0.88m | 4:53AM0.43m | 3:24PM1.05m | 6:23AM0.36m | 5:48PM1.18m | 7:47AM0.25m | 8:17PM1.17m | ||||||||
— | — | 4:52 | — | — | 4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — | |
6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:39 | — | — | 6:38 | — | |
mm | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | 4 | 2 | — | — | — | — | — |
Temp °C | 25 | 24 | 28 | 29 | 24 | 28 | 29 | 27 | 31 | 29 | 26 | 27 | 29 | 27 | 29 | 29 | 26 | 29 | 28 | 25 |
Feels °C | 26 | 23 | 26 | 27 | 24 | 28 | 29 | 29 | 33 | 31 | 29 | 28 | 31 | 31 | 32 | 32 | 30 | 30 | 31 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 16 | SE 17 | SE 17 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 14 | SSE 14 | S 15 | S 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SE 9 | SSW 13 | SSW 13 | ESE 13 |
1672 | 2794 | 3723 | 4228 | 5341 | 5796 | 5220 | 3651 | 3517 | 3681 | 3277 | 2379 | 1948 | 1399 | 1224 | 926 | 365 | 563 | 468 | 539 | |
Swell 2 Height (m) Direction Period (s) | SE 20 | E 14 | E 14 | E 13 | — | — | — | — | E 10 | ESE 10 | ESE 10 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SSW 14 | ESE 13 | ESE 12 | SSW 10 |
396 | 34 | 60 | 31 | — | — | — | — | 255 | 80 | 151 | 353 | 294 | 281 | 362 | 343 | 813 | 497 | 276 | 141 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | E 16 | — | ENE 16 | E 15 | E 15 | E 15 | E 14 | ESE 12 | — | SE 9 | SE 9 | SW 14 |
— | — | — | — | — | — | — | — | 5 | — | 24 | 17 | 17 | 17 | 16 | 81 | — | 90 | 120 | 151 | |
Wind waves Height (m) Direction Period (s) | NE 4 | ENE 4 | NE 4 | — | — | NE 4 | — | E 10 | NE 4 | ESE 10 | — | — | — | ESE 9 | ESE 9 | ESE 9 | — | — | — | — |
17 | 28 | 20 | — | — | 24 | — | 392 | 18 | 402 | — | — | — | 604 | 591 | 691 | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 515 | 454 | 111 | 27 | 454 | 451 | 30 | 0 | 30 | 27 | 30 | 30 | 29 | 27 | 27 | 27 | 27 | 30 | 9 | 1016 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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Information about the Sakawa River Surf forecast
The above surf forecast table for Sakawa River provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sakawa River can be found by selecting the local surf guide option on the grey menu. Our Sakawa River 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 (Sakawa River) 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 Sakawa River 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.
Sakawa River is 2 km (1 miles) from Odawara. If you plan a holiday in Kanagawa, look for hotels and other accommodation in Odawara. Odawara has rooms for a wide range of budgets as well as car hire and transport links.











