Surf Forecasts:
Sakawa River surf forecast from 15 Aug 2026:
- Best quality surf: Monday 17 Aug, 3AM (local time) - 2ft (0.6m), 9s period, ESE swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 9PM (local time) - 4ft (1.2m), 8s period, ESE swell with 197 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 3AM (local time) - 2ft (0.6m), 9s 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 Monday (Aug 17) at 3AM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.4m and 9s. 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 1.2m 8s and forecast to arrive on Thursday (Aug 20) 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+) | 3AM (Mon 17th Aug) | 2ft (0.6m) 9s |
| Best Surf | 3AM (Mon 17th Aug) | 2ft (0.6m) 9s |
| Most Powerful | 9PM (Thu 20th Aug) | 4ft (1.2m) 8s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Right then, let's get into it. This is Rusty, and I'm looking at what we've got on offer. For the Sakawa River, it's a bit of a story of two halves. A long, flat, frustrating wait, and then a big, powerful pulse to finish things off.
We're looking at a pretty grim start. From Saturday the 15th of August right through to Friday the 22nd, it's a write-off. The combined swell energy is weak, barely scraping into the triple digits at times, with most days seeing nothing worth paddling out for. You're looking at a week with no real surf on the cards. It's a frustrating stretch, no doubt.
The first real glimmer of hope comes on Saturday the 22nd of August. There’s a small, glassy morning with a 2ft swell from the SSW. The energy is still just moderate (146), but the clean conditions will at least get you wet. It’s surfable, but nothing to write home about. This spot is fairly consistent, so this kind of dry spell isn't the norm, and it feels like the ocean is just saving up for something.
And boy, does it save up. The real story, the one that has my attention, kicks off on Monday the 24th of August. The swell from the SE jumps to a solid 8ft with a very long 17-second period. The combined energy rockets to 3800 – that's serious power. It's a bit messy in the morning with a cross-onshore wind, but by Monday afternoon, the wind goes glassy, and the swell pushes to 10ft. The report calls it excellent for experienced surfers, and I'd agree. Sakawa River is a river mouth, and a long-period SE groundswell like this is what it's built for. This is the standout.
Tuesday the 25th and Wednesday the 26th keep that big 10ft+ swell running, but the wind gets a bit more messy. The conditions are there for strong surfers who know the spot. The water temp is sitting at 82°F, which is about average for this time of year, so no shock when you hit the water.
Thursday the 27th of August is interesting, but for a different reason. That morning, the swell pumps up to 12ft from the SE. The combined energy is over 4000, and the wind is a light cross-shore from the SSW. It sounds epic, but the guidance flat out says the swell is predicted to be too big for this break. That's a serious caveat. For the vast majority of us, that’s a day to watch from the bank. The afternoon drops back down to a cleaner 6ft from the ESE, which is more manageable but not the standout moment.
After that big pulse, things fade out in the final days of August into some small, long-period pulses that are surfable but ordinary. Saturday the 29th has a glassy morning with a 3ft, 13-second swell, but the energy is low. It’s a clean, small day for a longboard.
So, to wrap it up: you've got a long week of waiting. The one true standout, the reason to keep your boards ready, is the afternoon of Monday the 24th of August. That's the session the river mouth is waiting for. Get on it.
- Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Sat morning. Warm (max 28°C on Sat morning, min 24°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Tue morning, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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) | E 10 | ESE 9 | SE 8 | ESE 10 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 6 | SE 10 | ESE 8 | SE 7 | ESE 7 | ESE 7 | SE 10 | SE 11 | SE 11 | ESE 9 | ESE 9 | S 11 | SSW 10 |
Wave Graph | |||||||||||||||||||||
384 | 99 | 59 | 81 | 73 | 68 | 48 | 47 | 26 | 31 | 41 | 56 | 36 | 69 | 26 | 29 | 34 | 86 | 94 | 62 | 133 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-on | cross | on | cross | cross | on | glassy | cross | on | cross | cross | on | cross | cross-on | on | glassy | on | cross-on | glassy |
High Tide | 6:38PM1.48m | 6:30AM1.47m | 6:58PM1.47m | 7:14AM1.36m | 7:18PM1.46m | 8:00AM1.24m | 7:37PM1.44m | 8:53AM1.12m | 7:57PM1.41m | 10:11AM1.02m | 8:20PM1.36m | 8:48PM1.29m | |||||||||
Low Tide | 12:15PM0.24m | 00:33AM0.52m | 12:43PM0.39m | 1:10AM0.46m | 1:08PM0.55m | 1:49AM0.43m | 1:29PM0.70m | 2:31AM0.45m | 1:44PM0.83m | 3:21AM0.48m | 1:46PM0.94m | 4:30AM0.52m | |||||||||
5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | |
— | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | |
mm | 2 | — | 2 | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 25 | 28 | 27 | 25 | 27 | 27 | 25 | 29 | 29 | 26 | 29 | 29 | 26 | 28 | 28 | 26 | 28 | 28 | 26 |
Feels °C | 30 | 29 | 28 | 29 | 29 | 28 | 30 | 29 | 28 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | ESE 6 | S 10 | SE 8 | ESE 10 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 6 | SE 8 | ESE 8 | SE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 8 | SE 11 | ESE 9 | ESE 9 | ESE 7 | SSW 10 |
66 | 51 | 59 | 81 | 73 | 68 | 48 | 47 | 26 | 31 | 41 | 56 | 36 | 29 | 18 | 14 | 30 | 86 | 94 | 36 | 133 | |
Swell 2 Height (m) Direction Period (s) | S 11 | SSE 8 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 11 | SSW 9 | S 8 | S 8 | S 9 | ESE 7 |
61 | 14 | 42 | 28 | 26 | 25 | 24 | 14 | 18 | 27 | 16 | 16 | 26 | 25 | 26 | 29 | 16 | 21 | 33 | 38 | 34 | |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SSE 10 | SE 12 | SE 12 | SE 11 | SE 11 | SE 11 | SE 11 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSE 7 | SSE 6 | SSE 6 | SSE 6 | SE 11 | S 12 | S 11 | SE 10 |
34 | 10 | 36 | 21 | 31 | 31 | 42 | 18 | 13 | 6 | 6 | 6 | 6 | 5 | 4 | 3 | 3 | 18 | 12 | 62 | 23 | |
Wind waves Height (m) Direction Period (s) | E 10 | ESE 9 | — | NE 2 | — | — | — | — | — | — | — | — | ENE 2 | ESE 7 | — | ENE 3 | E 8 | — | — | — | — |
384 | 99 | — | 1 | — | — | — | — | — | — | — | — | 1 | 69 | — | 1 | 34 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 58 | 38 | 22 | 58 | 38 | 58 | 58 | 58 | 50 | 50 | 73 | 73 | 50 | 110 | 73 | 53 | 0 | 50 | 53 | 0 |
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.











