Surf Forecasts:
Sakawa River surf forecast from 20 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 12PM (local time) - 11ft (3.5m), 16s period, S swell with cross-onshore winds.
- Most powerful swell: Thursday 27 Aug, 12AM (local time) - 16ft (5.0m), 12s period, SSE swell with 6,844 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 3AM (local time) - 1.5ft (0.5m), 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 Saturday (Aug 22) at 3AM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.4m and 11s. Another secondary swell of 0.4m and 3s 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 5.0m 12s and forecast to arrive on Thursday (Aug 27) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sat 22nd Aug) | 1.5ft (0.5m) 10s |
| Best Surf | 12PM (Tue 25th Aug) | 11ft (3.5m) 16s |
| Most Powerful | 12AM (Thu 27th Aug) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright folks, Rusty here, and I’ve got the lowdown on what’s shaking out for the Sakawa River area over the next couple of weeks.
First off, the water temp is sitting at 80°, which is about average for this time of year, so nothing freaky – just your usual warm bath.
We’re looking at a rough start. Thursday the 20th through to Sunday the 23rd is pretty much a write-off. Tiny little waves, mostly under 2ft, with a mix of onshore winds and a lot of “poor surf conditions” in the forecast. You’ll be staring at flat, bumpy water. The combined swell energy is weak all through this period, bottoming out around 42 and not breaking 100 until Sunday afternoon. Honestly, it’s a good time to wax your board or go for a paddle.
Now, there’s a gap of very ordinary conditions until we get to Sunday afternoon, the 23rd. That’s when we finally see a pulse. The swell ticks up to 2ft from the SSE, with a period of 14 seconds, and the energy jumps to 226. It’s glassy, so the surface will be clean. But it’s only just “surfable,” nothing to write home about.
But hold onto your wetsuits, because the real standout is Monday morning, the 24th of August. That’s your best bet. Sakawa River is a river break, and it’s fairly exposed to swell, with the optimum direction being SE. We’ve got a solid 7ft swell from the SSE, with a very long period of 16 seconds. That’s proper groundswell energy – the combined energy is a hefty 2459. The wind is glassy, dead calm. This is excellent surf for experienced surfers. The water will be clean, the lines will be long and powerful. Just a heads up, though: with that long period, it can make river mouths and beach breaks a bit shifty, but for a river mouth, it should set up nicely. Crowds are “sometimes” an issue here, so you might have some company, but it’s worth it.
After that, things get a bit wild. Monday afternoon and Tuesday the 25th still have size – 8ft to 12ft – but the winds swing onshore and the comments say the swell is actually getting too big for this break. The energy is massive, hitting 5181 and 6128, but it’s a mess. Wednesday the 26th is even bigger, with a 13ft swell and a combined energy of 10317, but the wind is cross or cross-onshore, and again, it’s just too much for the Sakawa River. This is strictly for the brave and the very experienced, if at all. The setup looks more interesting for kite surfing than paddle surfing at that size.
We get a bit of a lull around Friday the 28th and Saturday the 29th, with smaller, cleaner surf in the 4ft to 6ft range. The winds are cross-offshore, so it’ll be clean, but the energy drops to 300-450 range. It’s okay, but nothing special.
The final little window to keep an eye on is Sunday the 30th of August, and again Monday the 31st of August. The morning sessions look best. On Sunday, we’ve got 6ft from the SSE at 11 seconds, glassy, with good energy (781). On Monday, a similar story: 4ft from the S at 13 seconds, glassy, with energy at 984. Both are clean and promising for a fun session, but the size is down from that Monday 24th peak.
After that, from the 1st of September onwards, the swell drops away and the wind picks up, so the window closes out.
So, bottom line: if you’re an experienced surfer, Monday morning the 24th of August is your winner. Don’t sleep on that. For the rest of us, keep an eye on Sunday the 30th and Monday the 31st for some clean, smaller waves.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Sat night. Warm (max 28°C on Thu morning, min 25°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun morning. Warm (max 29°C on Tue morning, min 25°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 10 | SE 11 | SE 11 | S 9 | S 9 | SE 10 | SSW 9 | SE 10 | SE 11 | SE 14 | SSE 14 | SSE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 17 | S 16 | S 15 | SSE 13 | SSE 12 | SSE 12 |
Wave Graph | |||||||||||||||||||||
27 | 30 | 29 | 40 | 39 | 28 | 47 | 32 | 31 | 53 | 178 | 969 | 2343 | 2682 | 3381 | 5128 | 6077 | 5912 | 5516 | 3487 | 6844 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross-on | cross-on | cross-off | glassy | cross-on | off | cross | glassy | glassy | glassy | cross-on | cross | cross-on | cross-on | cross-off | cross | cross-on | cross-off |
High Tide | 10:11AM1.02m | 8:20PM1.36m | 8:48PM1.29m | 9:51PM1.23m | 4:23PM1.21m | 00:27AM1.21m | 4:22PM1.27m | 1:56AM1.27m | 4:35PM1.33m | 2:52AM1.35m | 4:51PM1.38m | ||||||||||
Low Tide | 1:46PM0.94m | 4:30AM0.52m | 6:10AM0.53m | 7:42AM0.47m | 8:28PM1.13m | 8:39AM0.38m | 9:13PM1.05m | 9:21AM0.30m | 9:43PM0.95m | 9:55AM0.23m | 10:11PM0.85m | ||||||||||
5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | 5:09 | — | — | |
— | 6:27 | — | — | 6:25 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | |
mm | — | 1 | — | — | 2 | — | — | 2 | 3 | 1 | 1 | — | — | — | — | — | — | — | — | 2 | 3 |
Temp °C | 28 | 27 | 26 | 28 | 27 | 26 | 28 | 28 | 26 | 25 | 27 | 26 | 28 | 28 | 26 | 29 | 29 | 27 | 28 | 27 | 26 |
Feels °C | 31 | 30 | 30 | 30 | 30 | 30 | 31 | 32 | 30 | 29 | 32 | 31 | 31 | 31 | 30 | 32 | 31 | 30 | 30 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SE 11 | SSW 8 | S 9 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSE 14 | SSE 16 | SSE 16 | SSE 16 | SSE 16 | SSE 17 | S 16 | S 15 | SSE 13 | SSE 12 | SSE 12 |
8 | 30 | 24 | 40 | 39 | 25 | 47 | 32 | 31 | 15 | 178 | 969 | 2343 | 2682 | 3381 | 5128 | 6077 | 5912 | 4749 | 3487 | 5264 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 6 | SE 11 | SE 11 | SE 11 | SE 10 | SSE 5 | SE 10 | SSE 5 | ESE 11 | S 8 | SSW 8 | SW 10 | E 12 | ESE 15 | ESE 14 | ESE 13 | E 13 | E 12 | E 16 | SSW 12 |
27 | 8 | 29 | 29 | 29 | 28 | 5 | 28 | 7 | 24 | 22 | 24 | 49 | 25 | 42 | 37 | 35 | 30 | 27 | 5 | 890 | |
Swell 3 Height (m) Direction Period (s) | S 10 | SSW 9 | SE 6 | SE 5 | ESE 6 | SSW 10 | SE 10 | E 9 | SE 11 | SE 14 | ESE 11 | ESE 10 | SSW 10 | SW 10 | ESE 15 | SW 10 | SW 10 | SSW 10 | E 18 | E 16 | E 16 |
7 | 16 | 5 | 4 | 3 | 20 | 16 | 7 | 30 | 53 | 23 | 20 | 67 | 35 | 42 | 16 | 16 | 10 | 25 | 47 | 75 | |
Wind waves Height (m) Direction Period (s) | — | SE 5 | — | SW 3 | S 3 | SSW 3 | — | S 5 | — | NE 2 | SE 4 | — | — | — | — | — | — | — | SSE 13 | — | SSE 12 |
— | 10 | — | 2 | 5 | 4 | — | 11 | — | 1 | 3 | — | — | — | — | — | — | — | 5516 | — | 6844 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 99 | 114 | 68 | 68 | 114 | 68 | 68 | 68 | 50 | 66 | 0 | 0 | 0 | 68 | 67 | 114 | 1187 | 114 | 24 | 58 | 58 |
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.











