Sakawa River Surf Break

Lat Long: 35.24° N 139.15° E

Sakawa River Surf Forecast and Surf Report

Issued: 8 am 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Sakawa River sea temperature is
27.9°C
1.3° 

Sakawa River surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Sakawa River surf forecast from 8 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 12AM (local time) - 6ft (1.8m), 10s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 9 Sep, 3AM (local time) - 8ft (2.4m), 10s period, SSW swell with 1,001 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 9PM (local time) - 3.5ft (1.0m), 9s 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 Tuesday (Sep 08) at 9PM. The primary swell is predicted to be 1.0m and 9s period with a secondary swell of 0.9m and 8s. 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 2.4m 10s and forecast to arrive on Wednesday (Sep 09) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Thursday (Sep 10) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Tue 8th Sep)3.5ft (1.0m) 9s
Best Surf12AM (Wed 9th Sep)6ft (1.8m) 10s
Most Powerful 3AM (Wed 9th Sep)8ft (2.4m) 10s

Table - best surf conditions forecast for Sakawa River over the next 16 days.


The Lowdown

Alright crew, Rusty here. Let's look at what the Sakawa River has in store for us over the next couple of weeks. It's going to be a bit of a mixed bag, with a promising start, a flat spell, and then some serious size on the horizon.

The best surf this week is on Tuesday the 8th of September. We've got a clean 5ft south swell rolling in with a period of 9 seconds and moderate energy (398). What really makes it special is that glassy wind – absolutely no chop on the water. The water is sitting at 82°, which is a touch warmer than usual for this time of year, so you can leave the thick rubber at home. The river mouth setup should be handling this perfectly. Keep in mind, crowds are possible here, so get in early.

Tuesday afternoon the wind picks up and swings cross-shore, messing up the surface, so the morning is the clear winner.

Wednesday the 9th sees the swell bump up. The morning has a 8ft SSW swell with a short 8-second period and a heap of energy (1346). The wind is clean cross-offshore, so the waves will look good, but at 8ft this is getting into expert-only territory. It's a bit raw for the average punter. Wednesday afternoon gets chopped out by the breeze again.

From Thursday the 10th through to Sunday the 13th September, the swell drops right off. We're looking at knee-to-waist high dribble at best, with a mix of onshore and cross-off breezes. It's just not worth paddling out for a couple of days.

Monday the 14th and Tuesday the 15th see a tiny pulse of 3-3ft SSE swell, but it's barely breaking. The morning sessions are glassy, so it'll be clean, but wave size is very ordinary. Good for a beginner to practice pop-ups, but not much else. Then we hit another dead spell from Wednesday the 16th through until Saturday the 19th. The swell is tiny, directions are all over the place, and there's nothing to get excited about.

Now, looking further out. Sunday the 20th of September is interesting. There's a big jump in swell, with a 6ft, 20-second period SE groundswell. The energy is through the roof (2180), but the wind is light cross-shore. That kind of period is going to make the river mouth break a bit straight and tricky. The afternoon pushes up to 8ft with 18-second period from the SE, but with onshore wind. It's marginal, and that’s a lot of water moving around.

Then, on Monday the 21st of September, we have a monster. An 12ft SSE swell with an 18-second period and insane energy (6653 in the morning, 7922 in the afternoon). The wind is clean offshore both morning and afternoon. This is a proper groundswell event. However, at this size, the Sakawa River is going to be absolutely pumping and very dangerous. The data says the swell is predicted to be too big for this break. This is strictly for experts only, and only if you really know the river's currents and channels. Tuesday the 22nd keeps the size up at 10ft with a 16-second period from the SE, but the wind goes cross, making conditions less ideal.

After that, the swell drops back down to nothing from Wednesday the 23rd.

The standout is Tuesday morning, the 8th of September. Glassy, clean 5ft surf at Sakawa River. The other big window is that huge swell on the 21st, but it's dangerously big for this spot, so I'd only mention it as a "watch from the bank" kind of day unless you are a hardened local expert.

Rusty.

Short Range Forecast

Heavy rain (total 50mm), heaviest during Thu night. Warm (max 29°C on Tue afternoon, min 19°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 12mm), heaviest on Fri afternoon. Warm (max 27°C on Sun afternoon, min 19°C on Fri morning). Wind will be generally light.

Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
3
3
0
0
0
1
1
1
1
1
0
0
1
0
0
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.5
S
9
1.4
S
9
1.8
SSW
10
2.4
SSW
8
1.7
S
9
1.4
S
9
1.2
S
9
1.1
S
8
0.9
S
8
0.8
S
8
0.8
S
8
0.8
S
7
0.6
S
7
0.3
ESE
14
0.4
ESE
13
0.5
SE
9
0.6
SE
9
0.7
SE
9
0.9
SE
10
0.9
SE
9
0.9
SE
9
Wave Graph
Metric surfscale
Energy kJ
372
318
603
782
506
298
210
173
105
78
71
70
39
37
68
41
64
77
131
144
118
Wind (km/h)
5
S
15
SSW
10
WSW
25
SW
25
SW
20
NE
15
NNE
15
NNE
10
NNE
10
NNE
5
NE
10
NNE
10
NNE
10
NE
10
NNE
10
NE
5
SE
5
NNW
5
ESE
10
S
5
WSW
Wind State
glassy
cross
cross-off
cross-off
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-off
cross
on
glassy
glassy
cross-on
glassy
High Tide
4:04PM1.39m
2:29AM1.38m
4:25PM1.43m
3:26AM1.47m
4:45PM1.46m
4:15AM1.53m
5:05PM1.48m
4:59AM1.54m
5:24PM1.50m
5:40AM1.52m
5:42PM1.51m
6:20AM1.46m
6:01PM1.51m
Low Tide
9:20PM0.95m
9:30AM0.17m
9:53PM0.79m
10:09AM0.18m
10:25PM0.63m
10:43AM0.24m
10:57PM0.49m
11:14AM0.34m
11:29PM0.37m
11:42AM0.46m
00:01AM0.29m
12:07PM0.58m
00:34AM0.27m
part cloud
part cloud
rain showers
clear
clear
mod rain
light rain
light rain
heavy rain
mod rain
mod rain
cloud
cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:20
5:20
5:20
5:22
5:22
5:22
5:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:00
6:00
5:59
5:57
5:55
5:53
5:52
 mm
1
10
2
4
33
6
6
Temp °C
28
29
27
29
29
23
20
20
20
20
20
21
22
22
22
26
27
25
28
28
25
Feels °C
32
32
29
29
30
23
20
20
20
22
22
23
24
24
24
29
31
29
31
31
29
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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