
Surf Forecasts:
Sakawa River surf forecast from 8 Aug 2026:
- Best quality surf: Monday 10 Aug, 12AM (local time) - 2.5ft (0.8m), 12s period, ESE swell with glassy winds.
- Most powerful swell: Monday 10 Aug, 9PM (local time) - 6ft (1.8m), 11s period, E swell with 771 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 12AM (local time) - 2.5ft (0.8m), 12s 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 10) at 12AM. The primary swell is predicted to be 0.8m and 12s period with a secondary swell of 0.6m and 10s. 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 1.8m 11s and forecast to arrive on Monday (Aug 10) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Thursday (Aug 13) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 10th Aug) | 2.5ft (0.8m) 12s |
| Best Surf | 12AM (Mon 10th Aug) | 2.5ft (0.8m) 12s |
| Most Powerful | 9PM (Mon 10th Aug) | 6ft (1.8m) 11s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright, let’s get into it.
The next couple of weeks at the Sakawa River are going to test your patience, that’s for sure. We’re looking at a long stretch of small, weak surf with a lot of cross and onshore wind messing things up. The good news is there’s a brief window early on and a hint of something a bit more promising later, but you’ll have to be picky about when you paddle out.
The water temp is sitting right at 81°F, which is dead on average for this time of year, so no surprises there. You’ll be in boardies or a springsuit for sure.
We start the run on Sunday morning, August 9th. There's a 3ft ESE swell rolling in with a 13-second period, and the energy is moderate at 527. But the wind is a cross-onshore breeze at 3 mph, which puts a few ripples on it. It’s pretty marginal, honestly. The river mouth isn't handling it well, and it’s not really worth getting too excited about. That same day in the afternoon is more of the same, still around 3ft but the energy drops a touch to 490.
Monday the 10th keeps things small, around 3ft, but the wind goes glassy in the afternoon. The swell direction stays ESE with a 12-second period. This is your best early shout. The energy is moderate at 279, and while it’s not big, it will be clean. If you can sneak out for a session, this is the one to go for. The Sakawa River (Kanagawa) break works on this ESE swell, and with glassy conditions, it’ll be your cleanest option for the next while.
After that, it falls apart a bit. Tuesday through to the end of the first week sees the swell drop right down. We’re looking at 2ft or less, with shorter periods, and a mix of cross-offshore and choppy winds. The energy drops into the low hundreds or even below 100, which is weak. There are a few morning windows with clean conditions from the NNE cross-offshore winds, but there just isn't any power behind the waves to make it worthwhile. It’s a long, flat-feeling stretch.
The second week is more of the same struggle. There’s a slight pulse of SE energy around Saturday the 15th and Sunday the 16th, pushing back up to 3ft, but the wind is messy and it’s not offering much. The energy goes up a bit, reaching 338, but the period drops and the wind direction keeps it lumpy. Monday the 17th sees the biggest swell of the whole period, with 5ft from the east, but the period is a weak 9 seconds and there’s a cross-onshore breeze. It’s going to be a jumbled mess, more of a wrestling match than a surf. To be honest, with that onshore wind and how it will be breaking, that setup looks more interesting for the kite surfers than for us paddle surfers. It might be worth watching from the bank.
There is a tiny window on Thursday morning, August 20th, where it might be surfable. The swell is 3ft from the ESE with an 8-second period, but the wind is a clean cross-offshore. The energy is only 126, so it’s weak, but at least it’s not completely blown out. It’s a long shot and very ordinary, but if you’re desperate, it might be the only thing close to a wave that day.
Beyond that, the forecast fades again with a small SSW pulse arriving on Sunday the 23rd. The swell is back up to 3ft with a 12-second period and moderate energy at 326, but the wind is on it and the conditions get messy. There’s a more promising forecast for Monday the 24th with SW cross-offshore winds, but the swell has already started to taper off and it’s another near-miss.
Overall, the pick of the fortnight is Monday afternoon, August 10th. It’s not big, but the glassy conditions will make it the best quality surf you’ll find for a while. If you can’t make that, the second week is mostly about waiting out the wind and hoping the forecasts change. It’s a tough run, but that’s the river for you. Keep your expectations low and your timing right.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Tue afternoon. Warm (max 29°C on Sun morning, min 23°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 27mm), heaviest during Thu morning. Warm (max 31°C on Fri afternoon, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 13 | ESE 13 | ESE 12 | ESE 12 | ESE 12 | ESE 11 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | E 9 | E 9 | E 11 | S 11 | SE 10 | SE 10 | ESE 11 |
Wave Graph | |||||||||||||||||||||
378 | 367 | 198 | 192 | 183 | 123 | 83 | 88 | 80 | 85 | 85 | 59 | 56 | 30 | 40 | 44 | 58 | 86 | 108 | 132 | 313 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | glassy | cross-on | glassy | cross-on | glassy | cross-on | cross-on | cross | on | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 4:05PM1.31m | 00:49AM1.35m | 4:36PM1.39m | 2:12AM1.41m | 5:04PM1.45m | 3:16AM1.49m | 5:30PM1.47m | 4:10AM1.55m | 5:55PM1.48m | 4:59AM1.57m | 6:17PM1.48m | 5:45AM1.54m | 6:38PM1.48m | ||||||||
Low Tide | 8:17PM1.17m | 8:52AM0.13m | 9:22PM1.10m | 9:44AM0.04m | 10:06PM0.99m | 10:28AM0.00m | 10:44PM0.87m | 11:08AM0.03m | 11:20PM0.74m | 11:43AM0.11m | 11:56PM0.62m | 12:15PM0.24m | 00:33AM0.52m | ||||||||
4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | |
— | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | |
mm | — | 1 | 2 | — | 1 | 1 | 2 | 3 | 5 | 3 | — | 4 | 7 | 1 | 1 | 1 | 4 | 6 | 7 | 3 | 5 |
Temp °C | 29 | 29 | 26 | 27 | 28 | 25 | 24 | 25 | 25 | 27 | 28 | 26 | 27 | 29 | 26 | 30 | 31 | 27 | 27 | 27 | 25 |
Feels °C | 32 | 32 | 30 | 30 | 32 | 27 | 28 | 27 | 29 | 28 | 29 | 28 | 27 | 29 | 28 | 31 | 33 | 30 | 28 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | ESE 13 | ESE 13 | ESE 12 | ESE 12 | ESE 12 | ESE 11 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | ESE 9 | E 9 | E 9 | E 11 | E 10 | SE 10 | SE 10 | ESE 11 |
378 | 367 | 198 | 192 | 183 | 123 | 83 | 88 | 80 | 85 | 85 | 59 | 56 | 26 | 40 | 44 | 58 | 77 | 108 | 132 | 313 | |
Swell 2 Height (m) Direction Period (s) | SSW 10 | SSW 11 | S 10 | S 11 | SSW 11 | SSW 10 | E 10 | E 11 | E 11 | E 10 | SE 4 | SE 4 | ESE 9 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | S 11 | E 10 | E 10 | S 11 |
144 | 117 | 74 | 88 | 91 | 80 | 75 | 60 | 36 | 18 | 5 | 3 | 16 | 30 | 28 | 16 | 28 | 86 | 73 | 71 | 88 | |
Swell 3 Height (m) Direction Period (s) | SE 12 | SW 13 | SW 11 | SW 12 | SW 11 | SW 11 | SSE 13 | SSE 13 | S 3 | SE 13 | E 10 | E 9 | SSE 12 | SSW 10 | SSE 12 | S 12 | SSE 11 | SSW 9 | SSW 11 | S 11 | SSE 12 |
5 | 6 | 20 | 21 | 5 | 5 | 16 | 17 | 1 | 26 | 17 | 15 | 14 | 10 | 13 | 25 | 12 | 8 | 39 | 58 | 14 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SSW 3 | SE 4 | — | NE 2 | NE 4 | NE 4 | NE 3 | NNE 3 | E 3 | — | NE 3 | — | NE 3 |
— | — | — | — | — | — | — | — | 3 | 2 | — | 1 | 12 | 15 | 5 | 5 | 2 | — | 2 | — | 3 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 27 | 27 | 0 | 38 | 0 | 29 | 0 | 68 | 111 | 22 | 40 | 30 | 90 | 66 | 0 | 73 | 66 | 0 | 89 | 30 | 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.











