Surf Forecasts:
Sakawa River surf forecast from 28 Aug 2026:
- Best quality surf: Monday 31 Aug, 9PM (local time) - 1.5ft (0.4m), 13s period, ESE swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 9PM (local time) - 2.5ft (0.8m), 10s period, SSW swell with 133 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 9PM (local time) - 1.5ft (0.4m), 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 Monday (Aug 31) at 9PM. The primary swell is predicted to be 0.4m and 13s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.4m and 3s is also forecast. 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 0.8m 10s and forecast to arrive on Wednesday (Sep 02) 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 0.8m 4s period and expected on Saturday (Sep 05) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 31st Aug) | 1.5ft (0.4m) 13s |
| Best Surf | 9PM (Mon 31st Aug) | 1.5ft (0.4m) 13s |
| Most Powerful | 9PM (Wed 2nd Sep) | 2.5ft (0.8m) 10s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright, let me give you the lowdown on what’s brewing around here for the next couple of weeks. Straight up, it’s slow going, with the Sakawa River being the only spot in the mix. It’s a river mouth setup, exposed to the southeast, so it’s got a different feel to an open beach.
We’re coming out of a flat spell right now. For the last few days of August—Saturday the 29th through Monday the 31st—the swell is tiny, just 0.2 feet to 0.4 feet, coming out of the SE or ESE. The periods bounce around, starting at 11 seconds on Saturday, dropping to 10 seconds on Sunday, then a long 14-second groundswell creeps in on Monday morning. Monday morning is glassy, which is a tease, but the combined wave energy is a weak 45. It’s just not enough to get you moving. The conditions are poor, the energy is low, and it’s a no-go.
Then on Tuesday the 1st of September, we get a little glimmer. That morning, the wind goes glassy out of the SSE at 3 mph, the swell kicks up to 0.5 feet from the east with a solid 12-second period. The combined energy hits a moderate 144. It’s still small, but it’s the first time in the outlook where the surface is clean and you might steal a little glide. After that, the wind swings onshore and the quality goes right back to poor for the rest of the day and through the next week.
We’re looking at a real dry stretch for quality through the end of the first week of September. On Saturday the 5th, you’ll see a bump—up to 1 feet from the ESE on the afternoon, with the energy climbing to 239, which is moderate. But even with clean cross-off wind from the north at 9 mph, the waves are only “surfable but very ordinary.” The river mouth just isn’t shaping up well.
Your one real standout in this whole 16-day window is way out there—Wednesday the 9th of September, in the afternoon. That’s a week and a half off, so take it as a promising call but not set in stone. The swell will be 1 feet out of the ESE, with an 11-second period, pushing a combined wave energy of 333—that’s moderate but with some push. The wind will be cross-off from the WSW at just 6 mph, leaving it clean. It’s the only session in the entire window that gets a solid “good surf conditions” tag. That’s your session. It’s a river, so that longer period swell will wrap in off the banks, giving you some fun walls. Crowds can show up here sometimes, so get there early if this one holds.
Before that, it’s a whole lot of nothing from the 2nd of September through the morning of the 9th. The waves that show are mostly 0.6 feet to 0.7 feet with messy winds. Not worth paddling out.
After that Wednesday the 9th window, the swell holds into Thursday the 10th, but the wind cranks up to 28 mph from the southwest, and the wave energy jumps to 496—strong stuff, but the river mouth will be a mess. Unless you want to get thrashed, pass on that. Friday the 11th looks cleaner with cross-off northeast wind at 9 mph, a 1-foot swell, and a 13-second period, but the energy is still high at 493, and the conditions are only marginal. Might appeal to the experienced crew if the banks are working, but it’s not the standout.
Water temperature? No anomaly given, so it’s about average for this time of year at the Sakawa River. Nothing wild.
So here’s the take: the next week and a half is mostly quiet. Your best bet is the afternoon of Wednesday the 9th of September. That’s the one to circle. The river break with that southeast groundswell and clean offshores could serve up some real fun waves.
- Rusty
Short Range ForecastModerate rain (total 11mm), heaviest on Fri night. Warm (max 28°C on Fri night, min 21°C on Sat afternoon). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 7 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 14 | ESE 13 | E 12 | E 12 | E 11 | SSW 9 | SSW 9 | SSW 10 | SSW 11 | SSW 11 | SSW 10 |
Wave Graph | |||||||||||||||||||
39 | 30 | 31 | 29 | 25 | 27 | 16 | 19 | 36 | 55 | 76 | 103 | 62 | 65 | 92 | 128 | 121 | 117 | 108 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross | cross-off | cross-off | glassy | glassy | glassy | cross-on | cross-off | glassy | cross-on | cross-off | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 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 | 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 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:15 | — | — | 5:16 | — | — | |
6:16 | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:07 | — | |
mm | 7 | — | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 25 | 23 | 21 | 23 | 25 | 24 | 27 | 28 | 26 | 29 | 29 | 26 | 29 | 29 | 27 | 28 | 29 | 27 |
Feels °C | 31 | 29 | 24 | 22 | 26 | 28 | 28 | 30 | 32 | 31 | 31 | 32 | 30 | 31 | 31 | 31 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | S 7 | S 7 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | ESE 13 | E 12 | E 12 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 11 | SE 7 | SE 7 |
39 | 28 | 19 | 11 | 25 | 27 | 16 | 15 | 14 | 55 | 76 | 103 | 48 | 65 | 92 | 128 | 121 | 54 | 64 | |
Swell 2 Height (m) Direction Period (s) | SSE 10 | SE 11 | SE 11 | SE 11 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 8 | SSW 10 | SSW 10 | S 9 | E 11 | ESE 10 | SE 6 | SE 7 | SE 7 | SSW 11 | SSW 10 |
18 | 30 | 31 | 29 | 11 | 11 | 11 | 11 | 11 | 31 | 52 | 43 | 62 | 36 | 15 | 43 | 45 | 117 | 108 | |
Swell 3 Height (m) Direction Period (s) | SE 13 | ESE 9 | ESE 9 | ESE 6 | ESE 5 | ESE 5 | ESE 5 | ESE 14 | ESE 14 | SE 9 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 10 | SSW 13 | ESE 10 | ESE 9 | E 9 |
7 | 7 | 9 | 7 | 3 | 3 | 3 | 19 | 36 | 23 | 16 | 16 | 16 | 17 | 34 | 16 | 18 | 17 | 7 | |
Wind waves Height (m) Direction Period (s) | — | — | NE 2 | NNE 3 | NNE 3 | — | — | — | — | SW 3 | — | — | — | — | SE 5 | — | — | SSW 3 | — |
— | — | 1 | 4 | 1 | — | — | — | — | 1 | — | — | — | — | 30 | — | — | 3 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 22 | 58 | 73 | 191 | 82 | 82 | 90 | 90 | 99 | 0 | 0 | 114 | 0 | 111 | 111 | 68 | 68 | 108 | 67 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











