Surf Forecasts:
Sakawa River surf forecast from 4 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, 12AM (local time) - 11ft (3.5m), 16s period, SE swell with 5,409 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 12AM. 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 4s period and expected on Tuesday (Aug 11) at 12PM.
| 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 | 12AM (Wed 5th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's look at the Sakawa River.
Right off the bat, we're looking at a stretch that starts with decent size but some tricky conditions. The water here is sitting at 82.4°, which is a touch warmer than normal for this time of year.
The first window of opportunity kicks off on Tuesday, the 4th of August. There's a solid 8.2ft SE groundswell rolling in with a very long 17-second period. The combined energy is strong, clocking in at (3782). The problem is the wind is a moderate cross-shore from the NE at 12 mph, which will put a bit of a chop on the surface. It's a river break, and with that long period, it should be lining up nicely, but the wind is just enough to knock it out of the "perfect" category. The size is right on the edge for beginners.
Wednesday morning, the 5th, looks like the standout. The swell drops a touch to 9.8ft, but it's still packing a punch with a 15-second period from the SE (4665 energy). The big difference is the wind: a clean 12 mph cross-offshore breeze from the NNE. That's going to groom the face nicely. The size is in that expert-only territory, but for the crew that can handle it, this is the session to target. Crowds are sometimes a factor here, so keep an eye out.
Things start to taper off from Thursday, the 6th, onward. The wind gets messy, switching onshore, and the swell steadily drops. The energy levels fall from the 3000s down into the 1000s, and by the weekend, we're looking at smaller, less powerful waves. The period drops, too, losing that groundswell grunt. There's a gap of a few days from the 10th to the 14th where the swell is tiny and the conditions are poor, with nothing really worth paddling out for.
Then, there's a hopeful flicker on Saturday, the 15th of August. The swell bumps back up to 5.2ft from the ESE with an 11-second period and (732) energy. The wind is a light cross-offshore from the NNE, which should make for clean, rideable waves. It's not a world-class day, but after that flat spell, it's the best option on offer for the second week. The period is on the shorter side, so it won't have the same power as the earlier swell.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu afternoon. Warm (max 30°C on Thu morning, min 23°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Warm (max 30°C on Fri morning, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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) | SE 17 | SE 16 | SE 16 | SE 15 | SSE 15 | SSE 14 | SSE 14 | S 15 | S 14 | S 14 | SSW 14 | SSW 14 | SSW 13 | SSW 14 | ESE 13 | ESE 15 | ESE 14 | SW 15 | ESE 13 | ESE 12 | ESE 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3723 | 4189 | 5409 | 4636 | 4033 | 2904 | 2844 | 3085 | 2710 | 2187 | 1548 | 1019 | 700 | 758 | 538 | 481 | 542 | 232 | 280 | 256 | 277 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross-off | cross-on | cross | cross | on | cross | cross | on | glassy | cross-on | on | cross | cross | cross-on | cross-off | cross-off | cross | cross-off |
High Tide | 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 | 4:36PM1.39m | 2:12AM1.41m | ||||||||
Low Tide | 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 | 8:52AM0.13m | 9:22PM1.10m | ||||||||
 | |  |  | | | |  |  | | |  | | |  | | | | | | | |
 | 4:52 | — | — | 4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — |
 | — | 6:44 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — |
mm | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | 1 | — | — | — | — | — | 1 |
Temp °C | 28 | 29 | 24 | 28 | 29 | 27 | 30 | 30 | 27 | 30 | 29 | 27 | 29 | 29 | 26 | 29 | 30 | 26 | 29 | 29 | 26 |
Feels °C | 26 | 27 | 24 | 28 | 30 | 30 | 33 | 33 | 32 | 32 | 32 | 31 | 32 | 31 | 31 | 30 | 31 | 26 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | SE 17 | SE 16 | SE 16 | SE 15 | SSE 15 | SSE 14 | SSE 14 | S 15 | S 14 | S 14 | SSW 14 | SSW 14 | SSW 13 | SSW 14 | ESE 13 | ESE 15 | SSW 13 | ESE 13 | ESE 13 | ESE 12 | ESE 13 |
| kJ | 3723 | 4189 | 5409 | 4636 | 4033 | 2904 | 2844 | 3085 | 2710 | 2187 | 1548 | 1019 | 700 | 758 | 538 | 481 | 468 | 229 | 280 | 256 | 277 |
Swell 2 Height (m) Direction Period (s) | E 14 | E 13 | — | E 13 | — | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | SE 9 | SE 9 | SE 9 | SE 8 | S 12 | SSW 13 | ESE 14 | SW 15 | SW 14 | SW 14 | SSW 12 |
| kJ | 59 | 31 | — | 29 | — | 312 | 260 | 114 | 140 | 183 | 269 | 255 | 210 | 173 | 300 | 265 | 542 | 232 | 149 | 147 | 150 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | E 17 | E 16 | E 16 | E 16 | E 15 | E 15 | E 15 | SW 16 | ESE 11 | SW 14 | SSE 8 | SSE 8 | S 10 | S 10 | S 10 | SW 14 |
| kJ | — | — | — | — | — | 6 | 5 | 5 | 5 | 17 | 17 | 17 | 196 | 71 | 272 | 101 | 47 | 108 | 80 | 70 | 97 |
Wind waves Height (m) Direction Period (s) | NE 4 | — | — | NE 4 | — | NE 4 | NE 4 | — | — | — | — | — | — | — | — | — | SE 9 | ESE 6 | NE 4 | ENE 4 | NE 4 |
| kJ | 20 | — | — | 15 | — | 12 | 15 | — | — | — | — | — | — | — | — | — | 110 | 40 | 21 | 11 | 16 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 111 | 27 | 454 | 451 | 41 | 22 | 34 | 41 | 22 | 22 | 27 | 0 | 27 | 27 | 9 | 22 | 27 | 1016 | 2038 | 2027 | 100 |
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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