Surf Forecasts:
Sakawa River surf forecast from 25 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 12AM (local time) - 4.5ft (1.4m), 12s period, S swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 12AM (local time) - 4.5ft (1.4m), 12s period, S swell with 553 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 12AM (local time) - 4.5ft (1.4m), 12s period with S 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 26) at 12AM. The primary swell is predicted to be 1.4m and 12s period with a secondary swell of 0.6m and 10s. Another secondary swell of 0.7m and 4s 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 1.4m 12s and forecast to arrive on Wednesday (Aug 26) 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 0.8m 4s period and expected on Wednesday (Aug 26) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 26th Aug) | 4.5ft (1.4m) 12s |
| Best Surf | 12AM (Wed 26th Aug) | 4.5ft (1.4m) 12s |
| Most Powerful | 12AM (Wed 26th Aug) | 4.5ft (1.4m) 12s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s talk about what’s up with the Sakawa River over the next couple of weeks. Honestly, the start of this forecast period is a bit of a slow burn. We’ve got waves on offer, but the quality is pretty ordinary for the first week or so, with a lot of "marginal" or "poor" labels on the tables. There’s a notable gap with no real recommendations for a solid stretch from late August right into early September.
The first real hint of something interesting doesn’t hit until Tuesday, 1st of September, when a sizeable bump in energy arrives. The combined energy of all swells directed here jumps to 532, which is moderate energy, and the swell comes in at 3 ft from the S with a very long period of 16 seconds. That’s proper groundswell. At Sakawa River, a long-period S swell like that will wrap in nicely, but that period is so long it might want to straighten out a bit. It’s a river break, so it should handle that better than a beachie. Wind is from the NE at 6 mph, making it a light cross-shore, which means those ripples will be small. It’s not clean perfection, but it’s the most promising we’ve seen.
The real standout, though, looks to be Wednesday, 9th of September. We’re seeing the biggest swell of the entire forecast, with a 6 ft swell from the S, period of 13 seconds, and a huge combined energy of 1473 – that’s strong wave energy. The wind is NNE at 12 mph, giving us a clean cross-offshore breeze. That’s a massive positive, meaning the river mouth should have some clean, peeling lines. This is definitely the best session on offer. Keep in mind it’s over a week away, so the exact positioning might change, but the ingredients are there for a proper day. The water temperature is running at 82°F, which is about normal for this time of year.
Before that, you’ve got some smaller windows. Wednesday morning, 3rd of September, sees 4 ft from the S, but it’s a cross-onshore wind, so not as clean. And by the weekend of the 6th and 7th, we get another rise in energy with 3 ft to 4 ft swells and cross-offshore winds on the 7th, but those are still carrying a "marginal" tag. The 6 ft on the 9th is the pick of the fortnight. Keep an eye on that one.
Stay salty,
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Thu morning. Warm (max 31°C on Tue afternoon, min 24°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Sat morning. Warm (max 28°C on Fri afternoon, min 22°C on Sun morning). Wind will be generally light. | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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) | SSE 12 | S 12 | S 11 | SSW 11 | SSE 8 | S 11 | S 10 | S 10 | S 9 | SSW 8 | S 7 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SSW 9 | S 12 | S 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 418 | 553 | 256 | 164 | 64 | 58 | 78 | 87 | 56 | 108 | 35 | 30 | 31 | 29 | 26 | 18 | 16 | 59 | 95 | 149 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross-off | cross-off | cross-off | glassy | cross | glassy | cross | cross-off | cross-off | cross | cross-off | glassy | glassy | glassy | glassy | cross-on | glassy |
High Tide | 4:35PM1.33m | 2:52AM1.35m | 4:51PM1.38m | 3:36AM1.42m | 5:08PM1.43m | 4:16AM1.47m | 5:27PM1.46m | 4:55AM1.50m | 5:45PM1.49m | 5:33AM1.50m | 6:05PM1.51m | 6:13AM1.47m | 6:25PM1.51m | |||||||
Low Tide | 9:43PM0.95m | 9:55AM0.23m | 10:11PM0.85m | 10:25AM0.20m | 10:39PM0.74m | 10:54AM0.20m | 11:08PM0.63m | 11:22AM0.24m | 11:38PM0.52m | 11:50AM0.32m | 00:10AM0.43m | 12:17PM0.43m | 00:44AM0.36m | |||||||
 |  | | | |  | |  |  | |  | |  |  | |  |  | | |  | |
 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — |
 | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — |
mm | — | 1 | — | — | 1 | 7 | 6 | 1 | — | — | 3 | 6 | 2 | — | 2 | — | — | — | — | — |
Temp °C | 31 | 27 | 30 | 31 | 28 | 26 | 24 | 25 | 28 | 28 | 27 | 24 | 23 | 23 | 23 | 24 | 24 | 27 | 27 | 26 |
Feels °C | 34 | 30 | 34 | 33 | 32 | 31 | 28 | 30 | 31 | 31 | 31 | 27 | 26 | 26 | 26 | 28 | 28 | 30 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | SSE 12 | S 12 | S 11 | SSW 11 | SSE 8 | S 6 | S 10 | S 10 | S 9 | SSE 9 | S 7 | S 7 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | S 12 | S 11 |
| kJ | 418 | 553 | 256 | 164 | 64 | 24 | 78 | 87 | 56 | 17 | 35 | 28 | 19 | 12 | 10 | 18 | 11 | 13 | 95 | 149 |
Swell 2 Height (m) Direction Period (s) | S 14 | SSE 10 | SSE 9 | SSE 9 | SSW 11 | SSE 10 | S 6 | SE 10 | SE 9 | ESE 8 | SSE 9 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | S 12 | SE 9 | SE 10 |
| kJ | 306 | 67 | 58 | 75 | 46 | 55 | 18 | 24 | 23 | 7 | 9 | 30 | 31 | 29 | 26 | 16 | 16 | 25 | 14 | 14 |
Swell 3 Height (m) Direction Period (s) | ESE 13 | ESE 13 | E 12 | ESE 12 | S 10 | S 11 | SSE 10 | ESE 10 | E 12 | E 11 | SE 13 | SE 13 | ESE 10 | ESE 10 | ESE 6 | SE 9 | E 6 | SE 10 | SSW 12 | ESE 12 |
| kJ | 59 | 33 | 26 | 28 | 53 | 58 | 38 | 19 | 11 | 9 | 7 | 7 | 9 | 9 | 4 | 3 | 1 | 15 | 15 | 14 |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | SW 4 | SW 4 | SW 5 | SSW 6 | SW 6 | — | SW 3 | SSW 8 | W 3 | NNE 3 | NE 3 | NE 2 | NE 2 | — | — | SSW 9 | SSW 3 | SSW 9 |
| kJ | 14 | 15 | 15 | 15 | 28 | 53 | 47 | — | 5 | 108 | 1 | 3 | 2 | 2 | 1 | — | — | 59 | 5 | 53 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 249 | 0 | 53 | 497 | 0 | 0 | 0 | 68 | 0 | 114 | 22 | 66 | 73 | 73 | 110 | 82 | 82 | 0 | 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.
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