Surf Forecasts:
Sakawa River surf forecast from 28 Aug 2026:
- Best quality surf: Friday 28 Aug, 6PM (local time) - 2.5ft (0.7m), 8s period, SSW swell with cross-offshore winds.
- Most powerful swell: Thursday 3 Sep, 9PM (local time) - 4.5ft (1.3m), 10s period, SSW swell with 333 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 6PM (local time) - 2.5ft (0.7m), 8s 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 Friday (Aug 28) at 6PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.3m 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 1.3m 10s and forecast to arrive on Thursday (Sep 03) 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 0.4m 4s period and expected on Friday (Aug 28) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Fri 28th Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 6PM (Fri 28th Aug) | 2.5ft (0.7m) 8s |
| Most Powerful | 9PM (Thu 3rd Sep) | 4.5ft (1.3m) 10s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Imperial
Alright crew, Rusty here. Let’s talk about Sakawa River. For the next week or so, honestly, it’s a tough watch. We’ve got a real quiet stretch through the end of August and into the start of September. The swell is tiny, mostly around 0.7 ft to 1 ft, and the wind is all over the place with a lot of cross or cross-on wind. The water temp is sitting pretty warm at 82°, about 2° above normal for this time of year. Nothing to get excited about there.
Then, on the morning of Tuesday, September 1st, we get a little bump. Swell comes up to 2 ft from the SSW, with a period of 10 seconds, and the wind goes glassy. The combined energy is still pretty weak at 134, and they’re calling it “surfable but ordinary.” Not exactly something to paddle out for, but if you’re desperate, the early morning is your only window. The rest of that week stays poor, with messy winds and small swell. We get another glimmer of hope on the morning of Saturday, September 5th, with a glassy 2 ft S swell, but again, it’s just “ordinary.”
The real standout, and the only one worth marking on your calendar, comes from Thursday, September 10th. This is a full week and a half away, so treat it as promising but not locked in. The swell jumps to 7 ft from the SSE, with a long period of 14 seconds. Combined energy is a strong 2028. This is serious groundswell energy. But here’s the catch: that long period can make a river mouth break a bit too straight and walled-up. It’s going to be powerful. The wind on the morning of the 10th is a light cross-shore from the NE at 10 km/h, which is okay. However, this swell is over 8 ft, so it’s expert-only territory. The morning of Friday, September 11th looks similar: 7 ft SSE swell, 14 seconds, light cross wind. Again, for experts only.
After that, the swell drops a bit but stays in the 6 ft to 6 ft range over the weekend, with onshore winds picking up, so it’s going to get messy. Honestly, for that 10th and 11th, if you’re an experienced surfer, the Sakawa River might offer a few big, powerful sets, but the river break setup means you’ve got to be smart about positioning. For everyone else, it’s a case of wait and see. The long-range gap of small, poor surf from now until that mid-September pulse is a tough run.
Stay safe, and don’t sell your board just yet.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri night. Warm (max 28°C on Fri afternoon, min 21°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 30°C on Wed morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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) | SSW 9 | SW 8 | S 7 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | S 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 111 | 132 | 38 | 30 | 31 | 29 | 25 | 27 | 16 | 19 | 17 | 74 | 77 | 133 | 128 | 125 | 157 | 180 | 184 | 222 | 163 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross | cross-off | glassy | cross-on | glassy | glassy | cross-on | cross-off | glassy | cross-on | cross-off | cross-on | cross-on | cross-off | cross | cross | cross |
High Tide | 5:27PM1.46m | 4:55AM1.50m | 5:45PM1.49m | 5:33AM1.50m | 6:05PM1.51m | 6:13AM1.47m | 6:25PM1.51m | 6:56AM1.41m | 6:47PM1.51m | 7:44AM1.31m | 7:09PM1.49m | 8:44AM1.20m | 7:34PM1.45m | ||||||||
Low Tide | 10:54AM0.20m | 11:08PM0.63m | 11:22AM0.24m | 11:38PM0.52m | 11:50AM0.32m | 00:10AM0.43m | 12:17PM0.43m | 00:44AM0.36m | 12:44PM0.57m | 1:22AM0.32m | 1:11PM0.72m | 2:06AM0.32m | 1:35PM0.87m | ||||||||
 | |  | |  | |  | |  |  | |  | |  | | | | | | |  | |
 | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:15 | — | — | 5:16 | — | — |
 | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:07 | — |
mm | — | — | 2 | — | 2 | 2 | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | 5 |
Temp °C | 27 | 28 | 28 | 24 | 23 | 22 | 24 | 24 | 25 | 28 | 29 | 26 | 28 | 28 | 26 | 30 | 29 | 26 | 30 | 29 | 27 |
Feels °C | 29 | 30 | 32 | 27 | 25 | 24 | 28 | 27 | 30 | 30 | 31 | 30 | 32 | 31 | 30 | 32 | 30 | 29 | 32 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 9 | S 7 | SSW 7 | SSW 8 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | S 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SE 7 | SSW 10 |
| kJ | 23 | 22 | 38 | 18 | 19 | 29 | 25 | 27 | 16 | 15 | 14 | 74 | 77 | 133 | 128 | 125 | 157 | 180 | 184 | 65 | 163 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ESE 9 | SSE 10 | SE 11 | SE 11 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 12 | SE 9 | ESE 11 | E 12 | E 11 | ESE 11 | ESE 7 | SE 7 | SE 7 | ESE 9 | SE 7 |
| kJ | 8 | 8 | 9 | 30 | 31 | 12 | 11 | 11 | 11 | 11 | 13 | 14 | 41 | 71 | 62 | 37 | 29 | 38 | 48 | 17 | 45 |
Swell 3 Height (m) Direction Period (s) | E 12 | E 11 | SE 13 | ESE 10 | ESE 10 | E 6 | ESE 5 | ESE 5 | ESE 5 | ESE 14 | ESE 13 | ESE 12 | SE 10 | SE 10 | SE 10 | ESE 7 | E 11 | ESE 10 | ESE 10 | SE 10 | SSE 10 |
| kJ | 11 | 9 | 7 | 9 | 9 | 3 | 4 | 2 | 2 | 19 | 17 | 28 | 16 | 15 | 15 | 9 | 20 | 10 | 18 | 15 | 10 |
Wind waves Height (m) Direction Period (s) | SSW 9 | SW 8 | W 3 | NE 3 | ENE 2 | E 5 | — | — | — | SSW 3 | S 3 | SSW 3 | — | — | — | — | — | — | — | SSW 10 | SW 3 |
| kJ | 111 | 132 | 1 | 2 | 1 | 7 | — | — | — | 1 | 5 | 2 | — | — | — | — | — | — | — | 222 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 68 | 12 | 66 | 96 | 73 | 82 | 82 | 50 | 90 | 68 | 68 | 0 | 0 | 114 | 0 | 68 | 68 | 0 | 68 | 1399 | 807 |
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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