
Surf Forecasts:
Sakawa River surf forecast from 1 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 9PM (local time) - 11ft (3.5m), 16s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 5 Aug, 12PM (local time) - 11ft (3.5m), 16s period, SE swell with 6,731 kJ wave energy.
- Next surfable swell (1★+): Sunday 2 Aug, 6AM (local time) - 3ft (0.9m), 15s period with ESE 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 Sunday (Aug 02) at 6AM. The primary swell is predicted to be 0.9m and 15s period with a secondary swell of 0.3m and 5s. The wind is predicted to be glassy 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 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Wednesday (Aug 05) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sun 2nd Aug) | 3ft (0.9m) 15s |
| Best Surf | 9PM (Tue 4th Aug) | 11ft (3.5m) 16s |
| Most Powerful | 12PM (Wed 5th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the cards for the Sakawa River over the next couple of weeks.
We’re in for a bit of a mixed bag, and honestly, the first few days are nothing to write home about. The surf is there, but it’s a bit average to start. The real standout window is going to be the middle of next week, when the river mouth really starts to pump.
The action kicks off on Sunday, August 2nd, but it’s a quiet start. We’ve got a 3ft swell from the ESE with a very long period of 16 seconds, but the wind is a cross-on from the ENE at 6 mph, so it’s a bit messy. The combined energy is weak (539) and the conditions are marginal. Honestly, not worth paddling out for.
Monday, August 3rd, sees the swell build a little. The morning brings a 6ft ESE swell, but the wind is a moderate cross-shore from the NE at 12 mph, creating a cross-chop. The energy is moderate (1386). The afternoon cleans up nicely with a cross-off wind from the NNE, making the 6ft SE swell look clean. It’s still a bit marginal, but the afternoon looks better.
Tuesday, August 4th, the morning is the best of the early week. Clear skies, a 8ft SE swell, and a clean cross-off wind from the NE at 12 mph. The combined energy is strong (3862). The waves are getting solid, but that’s right on the edge of being too big for beginners. The afternoon, however, turns ugly with a 10ft swell and a cross-on breeze from the ENE at 16 mph, making for messy, choppy conditions.
Now, Wednesday, August 5th, is where it gets interesting, but there’s a big caveat. The swell jumps to 12ft from the SSE with a very long period of 16 seconds. The combined energy is very strong (5884). The wind is clean and cross-off from the NE in the morning, staying clean through the afternoon. The forecast notes say the wind and tide are favorable, but the swell is predicted to be too big for this break. This is expert-only territory. Long period groundswell like this, at 12ft, will be a powerful, surging beast at the river mouth. Not for the faint of heart.
Thursday, August 6th, keeps the energy high with a 12ft SSE swell, but the wind goes cross-shore from the NE, creating a chop. The energy is still very strong (6274). The swell is still too big for most, and the wind isn’t helping.
The swell starts to drop on Friday, August 7th, down to 8ft from the S, but it’s still a cross-on wind from the E at 6 mph. The energy is moderate (2543). It’s a step down in size, but the conditions are still marginal.
The following weekend, August 8th and 9th, the swell drops off significantly. The river goes quiet, with small, weak swells and onshore winds. It’s a write-off.
We then hit a real flat spell. From Monday, August 10th, through to Wednesday, August 12th, the swell is tiny and the energy is weak. The river is barely moving. You’re looking at a gap of several days with no real surf to speak of.
Then, on Thursday, August 13th, the river wakes up again. The afternoon session is the real hidden gem. We’ve got a 6ft ESE swell, and the wind goes glassy from the W at 3 mph. The combined energy is moderate (752). The forecast says to expect very good surf conditions. This is the one to circle. Clean, glassy, and the river mouth should be offering up some nice, clean lines.
Friday, August 14th, the swell holds at 6ft from the ESE, but the wind goes cross-shore from the SW, making it a bit choppy. Still a decent option but not as clean as the day before.
The last weekend of the forecast, August 15th and 16th, sees the swell drop again, with onshore winds and poor conditions. The window is closing.
So, to sum it up: The standout is the afternoon of Thursday, August 13th at the Sakawa River. That glassy, 6ft SE swell will be the cleanest and most user-friendly wave of the whole run. The morning of Tuesday, August 4th is a solid second choice for a bigger, clean wave, but it’s for more experienced surfers. The Wednesday, August 5th swell is just too big for the river.
Remember, the river mouth can be a fickle beast. It’s fairly consistent, but it needs the right conditions. These long period swells, while powerful, can sometimes break a bit straight at a river mouth, but when the wind is off, it’s a treat.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun morning. Warm (max 31°C on Sun morning, min 22°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Wed afternoon, min 25°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | |||||||||||||||
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) | ESE 16 | SE 15 | ESE 15 | SE 16 | SE 16 | SE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 15 | SSE 16 | S 16 | S 16 | S 15 | S 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 |
Wave Graph | |||||||||||||||||||||
525 | 489 | 794 | 1239 | 1672 | 2652 | 3214 | 4328 | 6124 | 6229 | 6553 | 5031 | 5341 | 5522 | 4532 | 3764 | 2508 | 1591 | 1080 | 975 | 631 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-on | cross-off | cross-off | cross | cross-off | cross | on | cross-off | cross-on | on | cross-off | cross | on | cross |
High Tide | 7:18PM1.46m | 7:00AM1.37m | 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 | ||||||||
Low Tide | 12:47PM0.29m | 1:15AM0.61m | 1:15PM0.41m | 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 | ||||||||
4:52 | — | — | 4:52 | — | — | 4:52 | — | — | 4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | |
— | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:39 | — | |
mm | 1 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 |
Temp °C | 31 | 31 | 27 | 26 | 27 | 24 | 28 | 28 | 25 | 28 | 30 | 27 | 30 | 29 | 27 | 29 | 29 | 26 | 29 | 29 | 26 |
Feels °C | 35 | 35 | 30 | 27 | 27 | 23 | 26 | 26 | 24 | 28 | 31 | 29 | 32 | 32 | 31 | 32 | 32 | 30 | 31 | 32 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | SE 15 | ESE 15 | SE 16 | SE 16 | SE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 15 | SSE 16 | S 16 | S 16 | S 15 | S 15 | SSW 14 | SSW 14 | SSW 14 | SE 9 |
525 | 489 | 794 | 1239 | 1672 | 2652 | 3214 | 4328 | 6124 | 6229 | 6553 | 5031 | 5341 | 5522 | 4532 | 3764 | 2508 | 1591 | 1080 | 975 | 287 | |
Swell 2 Height (m) Direction Period (s) | SSW 5 | SE 9 | SSE 9 | S 13 | E 14 | E 14 | E 14 | E 13 | — | — | — | E 10 | ESE 10 | E 10 | ESE 10 | ESE 9 | SE 9 | ESE 10 | SE 9 | SE 9 | SSW 14 |
5 | 20 | 8 | 3 | 36 | 4 | 59 | 31 | — | — | — | 208 | 306 | 234 | 111 | 450 | 237 | 145 | 243 | 238 | 631 | |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SSE 9 | SW 5 | — | — | — | — | — | — | — | — | — | E 16 | E 16 | — | ENE 15 | E 15 | SSE 8 | — | ESE 12 | S 12 |
9 | 9 | 5 | — | — | — | — | — | — | — | — | — | 20 | 20 | — | 21 | 17 | 92 | — | 57 | 45 | |
Wind waves Height (m) Direction Period (s) | — | S 6 | ENE 3 | NE 4 | NE 4 | ENE 4 | NNE 4 | NE 4 | NE 4 | NE 4 | — | — | NNE 4 | — | ESE 10 | — | ESE 9 | — | — | — | — |
— | 12 | 3 | 10 | 11 | 27 | 29 | 26 | 24 | 24 | — | — | 29 | — | 407 | — | 445 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 22 | 27 | 30 | 66 | 111 | 454 | 454 | 454 | 454 | 515 | 30 | 30 | 30 | 27 | 0 | 30 | 58 | 30 | 38 | 38 |
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.











