Surf Forecasts:
Sakawa River surf forecast from 26 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 9PM (local time) - 5ft (1.5m), 14s period, S swell with glassy winds.
- Most powerful swell: Tuesday 1 Sep, 9PM (local time) - 5ft (1.5m), 14s period, S swell with 880 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 3PM (local time) - 2.5ft (0.7m), 11s 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 Wednesday (Aug 26) at 3PM. The primary swell is predicted to be 0.7m and 11s period with a secondary swell of 0.7m and 9s. Another secondary swell of 0.8m 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 1.5m 14s and forecast to arrive on Tuesday (Sep 01) at 9PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Aug 28) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Wed 26th Aug) | 2.5ft (0.7m) 11s |
| Best Surf | 9PM (Tue 1st Sep) | 5ft (1.5m) 14s |
| Most Powerful | 9PM (Tue 1st Sep) | 5ft (1.5m) 14s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
G’day, Rusty here. Looks like we’ve got a bit of a slow burner on our hands at Sakawa River. The first week is pretty grim, with barely a ripple worth paddling for, but there’s some serious firepower building for the second week that gets the heart pumping. It’s a river mouth setup that’s fairly consistent and fairly exposed to the south, and with an optimum swell direction out of the southeast, it’s got a specific window that needs to line up.
Right now, it’s flat to tiny. Wednesday the 26th starts off with a bit of hope – a glassy 3 ft south swell with 11-second period and side-offshore breeze. Wave energy is weak (349), but the water’s a balmy 82°, about average for this time of year. It’s surfable, but honestly, it’s nothing to write home about. After that, the 27th through to the 31st is a write-off. Swell drops to 1.0 ft to 2 ft, with cross-shore winds or onshore slop, and most of the ratings are poor. There’s a couple of glassy moments on the 31st morning, but with only 1.0 ft on offer, you’d be better off with a coffee.
Then we hit a dry spell from September 1st onwards that builds into something special. Tuesday the 1st kicks off with a tiny glassy 1 ft swell in the morning, but the afternoon gets interesting fast – a 4 ft south swell with an insane 16-second period and wave energy at 893. That long period (over 15 seconds!) is a proper groundswell, packing punch and longer lulls. It’s a bit cross-onshore though, so it’s marginal.
Wednesday the 2nd shows the swell size growing: 6 ft in the morning (cross-onshore, 12-second period, 818 energy) and then 7 ft in the afternoon, but with 12 mph southerly winds making it choppy, that afternoon is a no-go. But hold onto your board – Thursday the 3rd is the real standout for the next few days. Morning glass – dead calm, 6 ft south swell, 11-second period, and 847 combined energy. That’s clean, meaty, and the wind is perfect. You’ll want to be on it early before the onshore kicks in after lunch.
Now, the big news is Sunday the 6th. Holy moly. 12 ft of south-southeast swell, 12-second period, with side-offshore winds and a combined energy reading of 3745 in the morning and 2655 in the afternoon. That’s huge energy. But here’s the catch: the data says that at this break, the swell is predicted to be too big. At over 8 ft, this is properly expert-only territory, and the river mouth might just be a washing machine for most. Not for the faint-hearted.
The absolute pick of the entire outlook, though, lands on Monday the 7th. Morning session: 7 ft south swell, 13-second period, zero wind – glassy as a mirror. Combined energy is 1605, and the forecast rates it an excellent session for experienced surfers. That’s the day to clear your schedule, get down early, and score some clean, powerful lines before the onshore kicks in during the afternoon. After that, it tapers off into smaller, cross-onshore conditions through to the 10th, with only tiny dribbles left.
So, while the first week is a total bust, there’s a proper window from Thursday the 3rd to Monday the 7th that builds into something special. Monday the 7th morning is the gold-star moment – mark it down. As for crowds, given it’s a river mouth that’s fairly exposed and has its moments, you can expect company on those good days.
Take it easy,
Rusty
Short Range ForecastHeavy rain (total 21mm), heaviest during Thu morning. Warm (max 31°C on Wed afternoon, min 24°C on Thu afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sat morning. Warm (max 27°C on Mon morning, min 22°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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) | S 11 | SSW 11 | SSE 8 | S 11 | S 10 | S 10 | S 9 | S 8 | S 8 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 11 | S 10 | SSW 19 | S 16 | S 13 |
Wave Graph | |||||||||||||||||||||
256 | 128 | 64 | 58 | 54 | 87 | 57 | 49 | 33 | 30 | 31 | 29 | 26 | 16 | 16 | 15 | 42 | 53 | 117 | 843 | 771 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-off | cross | cross-off | cross | cross | cross-off | cross-off | cross | cross-off | glassy | cross | cross | glassy | glassy | cross-on | glassy | glassy | cross-on | glassy |
High Tide | 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 | 6:56AM1.41m | 6:47PM1.51m | ||||||||
Low Tide | 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 | 12:44PM0.57m | 1:22AM0.32m | |||||||
5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | |
— | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | |
mm | — | — | 2 | 7 | 3 | 1 | 1 | — | 7 | 3 | 1 | 3 | 1 | — | — | — | — | — | — | — | 1 |
Temp °C | 30 | 31 | 28 | 26 | 25 | 25 | 27 | 28 | 26 | 24 | 23 | 23 | 24 | 24 | 24 | 27 | 27 | 26 | 28 | 28 | 26 |
Feels °C | 34 | 34 | 32 | 31 | 29 | 28 | 29 | 32 | 30 | 27 | 25 | 25 | 27 | 27 | 28 | 31 | 31 | 31 | 30 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | S 11 | SSW 11 | SSE 8 | S 6 | S 10 | S 10 | S 9 | S 8 | S 8 | SSW 8 | SSW 8 | SSW 8 | SE 10 | SSW 7 | SE 10 | SE 10 | SSW 11 | S 10 | S 10 | S 16 | S 13 |
256 | 128 | 64 | 24 | 54 | 87 | 57 | 49 | 33 | 19 | 19 | 11 | 26 | 10 | 16 | 15 | 42 | 53 | 64 | 843 | 771 | |
Swell 2 Height (m) Direction Period (s) | SSE 9 | SSE 9 | SSW 11 | SSE 10 | S 6 | SE 10 | SE 9 | SE 9 | SSE 9 | SE 11 | SE 11 | SE 11 | SSW 8 | SE 10 | SSW 7 | SSW 9 | SE 9 | SE 9 | SSW 19 | ESE 10 | ESE 10 |
56 | 75 | 46 | 55 | 17 | 24 | 23 | 22 | 9 | 30 | 31 | 29 | 11 | 16 | 11 | 15 | 14 | 22 | 117 | 35 | 33 | |
Swell 3 Height (m) Direction Period (s) | E 12 | ESE 12 | S 10 | S 11 | SSE 10 | ESE 10 | E 12 | ESE 9 | SE 13 | ESE 8 | ESE 9 | ESE 6 | ESE 5 | SE 9 | E 3 | S 12 | SSW 8 | ESE 12 | ESE 11 | SE 10 | SE 10 |
26 | 28 | 53 | 58 | 38 | 19 | 11 | 8 | 7 | 7 | 9 | 4 | 2 | 3 | 1 | 11 | 13 | 13 | 23 | 15 | 16 | |
Wind waves Height (m) Direction Period (s) | SW 4 | SSW 4 | SW 5 | SSW 6 | ENE 3 | — | — | WSW 3 | WNW 3 | NNE 2 | NE 3 | E 3 | — | NE 3 | NNE 2 | — | — | — | — | — | — |
11 | 19 | 30 | 51 | 3 | — | — | 4 | 1 | 1 | 2 | 1 | — | 2 | 1 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 9 | 0 | 67 | 67 | 9 | 50 | 73 | 73 | 96 | 50 | 82 | 82 | 50 | 50 | 0 | 0 | 58 | 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.











