Surf Forecasts:
Sakawa River surf forecast from 8 Aug 2026:
- Best quality surf: Sunday 9 Aug, 12AM (local time) - 3.5ft (1.1m), 13s period, ESE swell with glassy winds.
- Most powerful swell: Saturday 15 Aug, 6PM (local time) - 7.5ft (2.3m), 12s period, E swell with 1,463 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 12AM (local time) - 3.5ft (1.1m), 13s 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 Sunday (Aug 09) at 12AM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 1.0m and 11s. 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 2.3m 12s and forecast to arrive on Saturday (Aug 15) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Saturday (Aug 15) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 9th Aug) | 3.5ft (1.1m) 13s |
| Best Surf | 12AM (Sun 9th Aug) | 3.5ft (1.1m) 13s |
| Most Powerful | 6PM (Sat 15th Aug) | 7.5ft (2.3m) 12s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright, Rusty here with the lowdown on the Sakawa River. It’s gonna be a slow burn, but there’s a clean window coming if you’re willing to wait.
The first good chance to get out isn’t until the weekend of the 9th and 10th of August. Before that, it’s mostly onshore trash and tiny, weak swell. The water’s a warm 81°, which is normal for this time of year, so no surprises there.
Sunday morning, the 9th, is the first real glimmer. The swell is a modest 3ft from the ESE with a solid 13-second period, giving it some push. The combined swell energy is a moderate 527, and with the wind going glassy from the east at just 3 mph, it’s going to be flat as a mirror. That’s the best you’ll see for a while. The Sakawa River is a river mouth, so that long-period groundswell will wrap in just right.
Monday morning, the 10th, is a bit smaller at 3ft, but the wind is still light, so it’s worth a look. Monday afternoon actually goes glassy again with a light SSW breeze, but the swell drops off a bit.
The mid-week is a total washout – tiny, weak, and choppy. Nothing doing.
The next standout window opens up on the weekend of the 16th of August. By Sunday the 16th, the swell builds to a solid 5ft from the ESE, with a 13-second period and very strong combined energy of 720. The wind is a clean offshore from the NNE at 6 mph, so those waves will be lined up and clean. This is the pick of the whole forecast. It’s getting into bigger territory, so it might be a bit much for beginners, but for the intermediate crew, it’s going to be excellent.
Monday the 17th holds good, clean conditions with a 4ft swell and glassy periods. Tuesday the 18th also has some clean, glassy waves in the morning at 3ft from the east.
After that, the surf fades away again. The 22nd and 23rd of August offer tiny, weak waves, barely worth paddling for. The 23rd morning has a 1ft swell with a very long 15-second period, but the energy is a weak 103, so it’ll be a sit-and-wait.
Overall, skip the first week. Circle the 16th and 17th of August on your calendar. That’s the one.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Mon night. Warm (max 29°C on Sat afternoon, min 22°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Wed morning. Warm (max 30°C on Thu morning, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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) | S 11 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | ESE 12 | ESE 12 | E 11 | SSW 10 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | S 10 | SSW 10 | SSW 10 | SSW 10 | ESE 9 | E 9 | ESE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 332 | 361 | 378 | 367 | 198 | 195 | 192 | 119 | 83 | 128 | 82 | 82 | 86 | 51 | 57 | 56 | 30 | 64 | 99 | 127 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | cross-on | glassy | cross-on | glassy | cross | cross-on | cross | cross-off | cross | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off |
High Tide | 3:24PM1.19m | 11:07PM1.33m | 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 | |||||||
Low Tide | 5:48PM1.18m | 7:47AM0.25m | 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 | |||||||
 |  |  |  | | |  |  |  | |  | | |  | | |  | |  |  | |
 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — |
 | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — |
mm | — | — | — | — | — | — | 1 | 6 | 2 | — | — | 3 | 1 | 1 | — | 1 | 1 | — | 6 | 16 |
Temp °C | 29 | 26 | 29 | 29 | 27 | 28 | 27 | 25 | 24 | 25 | 25 | 27 | 27 | 24 | 30 | 30 | 26 | 28 | 27 | 24 |
Feels °C | 32 | 30 | 32 | 32 | 31 | 31 | 30 | 28 | 25 | 26 | 28 | 28 | 28 | 25 | 30 | 31 | 27 | 28 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | S 11 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | ESE 12 | ESE 12 | E 11 | SSW 10 | E 11 | SSW 10 | SSW 10 | ESE 5 | S 10 | SSW 10 | SSW 10 | SSW 10 | ESE 9 | SSE 11 | ESE 8 |
| kJ | 332 | 361 | 378 | 367 | 198 | 195 | 192 | 119 | 83 | 60 | 82 | 82 | 19 | 51 | 57 | 56 | 30 | 64 | 66 | 127 |
Swell 2 Height (m) Direction Period (s) | ESE 12 | S 11 | SSW 10 | SSW 11 | S 10 | S 11 | SSW 11 | SSW 10 | E 10 | SSE 13 | E 11 | E 10 | SSW 10 | ESE 4 | ESE 9 | ESE 9 | ESE 9 | SSW 9 | SSW 9 | SE 11 |
| kJ | 161 | 227 | 144 | 117 | 74 | 88 | 91 | 80 | 80 | 16 | 20 | 17 | 86 | 7 | 15 | 16 | 16 | 28 | 17 | 90 |
Swell 3 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SE 12 | SW 13 | SW 11 | SW 11 | SE 10 | SSE 14 | SE 13 | SE 13 | SE 13 | S 4 | E 10 | E 9 | ESE 4 | ESE 12 | ESE 4 | S 9 | — | SSW 9 |
| kJ | 36 | 23 | 5 | 6 | 20 | 20 | 4 | 19 | 26 | 26 | 6 | 3 | 16 | 15 | 1 | 13 | 4 | 15 | — | 28 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SSW 11 | S 4 | ENE 3 | ESE 5 | — | NNE 4 | ENE 3 | — | NE 3 | E 9 | NE 4 |
| kJ | — | — | — | — | — | — | — | — | — | 128 | 5 | 4 | 49 | — | 7 | 1 | — | 5 | 99 | 8 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 454 | 0 | 0 | 27 | 0 | 30 | 0 | 66 | 24 | 108 | 0 | 30 | 30 | 9 | 30 | 66 | 31 | 110 | 111 | 111 |
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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