Surf Forecasts:
Sakawa River surf forecast from 12 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 9PM (local time) - 2ft (0.6m), 10s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 3PM (local time) - 5ft (1.5m), 10s period, E swell with 441 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 9PM (local time) - 2ft (0.6m), 10s period with SSW 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 12) at 9PM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.6m and 5s. Another secondary swell of 0.8m and 5s is also forecast. 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 1.5m 10s and forecast to arrive on Saturday (Aug 15) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 2s period and expected on Thursday (Aug 13) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 12th Aug) | 2ft (0.6m) 10s |
| Best Surf | 9PM (Wed 12th Aug) | 2ft (0.6m) 10s |
| Most Powerful | 3PM (Sat 15th Aug) | 5ft (1.5m) 10s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get straight into it. It’s a bit of a rough stretch ahead for the Sakawa River mouth. If you’re looking for a classic session, you’re going to have to be patient. The first proper chance to paddle out doesn't show up until Wednesday morning, August 12th, and even then, it’s a real mixed bag. We’ve got a small, weak 2ft swell from the south, with a middling period of 10 seconds, pushing just moderate wave energy (147). The water is a warm 82°, which is about normal for this time of year. The wind is a light, cross-off breeze from the north, which will keep the surface clean. The potential is there, but it’s hardly a standout.
The real story here is the waiting game. From Wednesday afternoon through to the end of the first week, the forecast is littered with poor conditions. Small, weak swells, often with onshore or cross-shore winds, will keep things messy. The swell tries to bump up a bit on the weekend. Saturday afternoon, August 15th, sees the swell height climb to 5ft from the east, and the energy jumps to a strong 582. But the wind is cross-onshore, so it’s going to be bumpy. Sunday afternoon, August 16th, is similar, with a 5ft east swell and strong energy (712), but again, that cross-onshore wind spoils the party. It’s borderline surfable, and the score reflects that, but it’s not the clean, groomed stuff we love.
The best chance for a decent wave comes late in the window. Keep an eye on Friday, August 21st. The morning sees a 4ft swell from the SSW, with a short, punchy 7-second period, and wave energy (197) is moderate. The wind is light and cross from the ENE. It’s not perfect, but it’s the most promising of the bunch. The afternoon gets a bit bigger at 6ft from the SSW, but the wind swings onshore, making it a messy, marginal option. For a river mouth setup, that short period, beach-break style swell might not be the best shape, but it’s what we’ve got.
There are no screaming standouts here. If you’re desperate for a paddle, your best bet is the Friday morning, August 21st, at Sakawa River. It’s a fairly consistent spot, but crowds are possible. The wind is workable, and the swell, while small, might offer a few fun ones. The rest of the 16-day window looks like a write-off, with flat spells and onshore junk. We’ve got a long gap from the 22nd onward with no real recommendations. It’s a tough run for the area, but forecasts can change. Hang in there.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Fri night. Warm (max 28°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sat afternoon, min 23°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Wed 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 10 | SSW 10 | SSW 10 | E 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | S 11 | E 10 | ESE 10 | ESE 10 | E 10 | ESE 10 | ESE 10 | ESE 10 | E 9 | SE 10 | SE 10 | SE 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 59 | 77 | 55 | 45 | 71 | 86 | 85 | 86 | 89 | 441 | 154 | 109 | 414 | 140 | 104 | 75 | 45 | 17 | 16 | 35 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross | cross-on | cross-off | cross | cross-on | cross-off | cross-on | cross-on | cross-off | cross | cross-on | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross-off |
High Tide | 5:30PM1.47m | 4:10AM1.55m | 5:55PM1.48m | 4:59AM1.57m | 6:17PM1.48m | 5:45AM1.54m | 6:38PM1.48m | 6:30AM1.47m | 6:58PM1.47m | 7:14AM1.36m | 7:18PM1.46m | 8:00AM1.24m | 7:37PM1.44m | |||||||
Low Tide | 10:44PM0.87m | 11:08AM0.03m | 11:20PM0.74m | 11:43AM0.11m | 11:56PM0.62m | 12:15PM0.24m | 00:33AM0.52m | 12:43PM0.39m | 1:10AM0.46m | 1:08PM0.55m | 1:49AM0.43m | 1:29PM0.70m | 2:31AM0.45m | |||||||
 |  |  | | | | | | |  |  |  | |  | | | | | | | |
 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — |
 | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:29 | — |
mm | 3 | 1 | 1 | 3 | 2 | 1 | 1 | 7 | 3 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 25 | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 28 | 26 | 28 | 28 | 25 | 26 | 27 | 25 | 27 | 28 | 25 |
Feels °C | 29 | 27 | 29 | 31 | 29 | 30 | 31 | 30 | 30 | 30 | 28 | 28 | 29 | 27 | 28 | 29 | 28 | 28 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | ESE 5 | SSW 10 | SSW 10 | E 9 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SE 5 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | E 9 | ESE 9 | SE 10 | SE 10 |
| kJ | 18 | 77 | 55 | 43 | 71 | 86 | 85 | 86 | 17 | 161 | 154 | 109 | 105 | 140 | 104 | 75 | 45 | 16 | 16 | 35 |
Swell 2 Height (m) Direction Period (s) | SSW 10 | SE 5 | ESE 9 | S 9 | SSW 9 | SSW 9 | SSW 9 | S 12 | ESE 9 | S 10 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SE 11 | SE 10 | SSW 8 | SSW 8 |
| kJ | 59 | 11 | 29 | 45 | 28 | 28 | 27 | 73 | 64 | 53 | 44 | 48 | 45 | 27 | 28 | 26 | 18 | 17 | 14 | 7 |
Swell 3 Height (m) Direction Period (s) | E 9 | E 9 | SSE 4 | E 12 | S 12 | SSE 11 | SSE 11 | SE 11 | S 11 | SSE 8 | SSE 8 | SE 12 | SE 11 | SE 11 | SE 11 | SE 11 | SSW 8 | SSW 8 | E 9 | E 8 |
| kJ | 16 | 15 | 2 | 11 | 11 | 12 | 12 | 18 | 89 | 7 | 7 | 21 | 19 | 30 | 30 | 18 | 14 | 14 | 6 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | NE 3 | — | — | NE 3 | — | SE 5 | — | E 10 | — | NE 3 | E 10 | — | — | — | — | — | S 2 | SW 3 |
| kJ | — | — | 3 | — | — | 2 | — | 16 | — | 441 | — | 2 | 414 | — | — | — | — | — | 1 | 2 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 22 | 0 | 66 | 66 | 0 | 66 | 58 | 0 | 41 | 27 | 0 | 30 | 27 | 66 | 66 | 50 | 68 | 68 | 249 |
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.
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