Sakawa River Surf Break

Lat Long: 35.24° N 139.15° E

Sakawa River Surf Forecast and Surf Report

Issued: 8 pm 12 Aug 2026 (local time)

Forecast update in  hr  min

Today's Sakawa River sea temperature is
27.3° C
0.2° 

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 12 Aug 2026:

  • Best quality surf: Saturday 15 Aug, 6AM (local time) - 5ft (1.5m), 10s period, E swell with cross-offshore winds.
  • Most powerful swell: Sunday 16 Aug, 9PM (local time) - 5ft (1.6m), 10s period, E swell with 460 kJ wave energy.
  • Next surfable swell (1★+): Thursday 13 Aug, 12AM (local time) - 2ft (0.6m), 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 Thursday (Aug 13) at 12AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.4m and 5s. Another secondary swell of 0.6m and 5s 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 1.6m 10s and forecast to arrive on Sunday (Aug 16) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Sunday (Aug 16) at 9AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Thu 13th Aug)2ft (0.6m) 10s
Best Surf 6AM (Sat 15th Aug)5ft (1.5m) 10s
Most Powerful 9PM (Sun 16th Aug)5ft (1.6m) 10s

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


The Lowdown

Alright folks, Rusty here, digging into the local forecast for the Sakawa River. Let's be straight with you right off the bat: the first week and a half is looking pretty grim. We've got a long stretch of small, weak, and messy conditions with very little to get excited about. The water temp is sitting about average for this time of year, so no surprises there.

The outlook for the next several days is a real struggle. From Thursday the 13th right through to Sunday the 23rd, the swell is tiny, mostly under 3ft, coming from the south and southeast. The wave energy is weak, staying in the double and low triple digits (like 107 or 126), and the period is short, around 8 to 10 seconds, so these are just wind slop waves. Winds are mostly cross, cross-onshore, or onshore, which means messy, chopped-up faces. There are a few glassy mornings, like Tuesday the 18th, Wednesday the 19th, and Thursday the 20th, but even then the swell is barely 1ft to 2ft with barely any energy (53 to 78). It's a tough run for surfers. The river mouth itself is fairly consistent, but with these conditions, it's just not working.

Then, just when you think it's all over, Tuesday the 25th of August throws a real curveball. We get a sudden spike in swell, with a solid 10ft groundswell from the SSE, with a very long period of 17 seconds. The energy reading jumps way up to 4667, which is strong. Now, on paper that looks amazing, but here's the catch: it's a river mouth, and a long-period swell like that tends to break too straight on beaches. Plus, the wind is cross-onshore, and the forecast notes 'marginal surf or questionable tide conditions.' The rating is there, but it’s a tricky one. This is definitely for experts only. The swell will ease off through the afternoon and into Wednesday, dropping to 4ft, but it's still a long-period swell that will hold some shape.

Honestly, the only real standout in this whole 16-day window is that Tuesday morning, the 25th. If you're an experienced surfer and you know the river, you might get a few. For everyone else, it's a long wait. The rest of the second week, after that pulse, fades back into small, poor surf.

So, to sum it up: a big old gap of nothing, then a sudden, powerful, but tricky window for the experts. Keep an eye on the forecasts for the 25th, but don't hold your breath for the rest.

Rusty.

Short Range Forecast

Moderate rain (total 17mm), heaviest on Wed night. Warm (max 29°C on Thu morning, min 24°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 29°C on Sun morning, min 22°C on Sun night). Wind will be generally light.

Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
1
0
0
1
0
0
0
0
0
1
0
0
1
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SSW
10
0.6
S
10
0.5
S
9
0.6
ESE
9
0.6
ESE
10
0.6
ESE
10
0.6
ESE
10
0.9
ESE
9
0.9
ESE
10
1
ESE
10
0.8
ESE
9
0.8
ESE
10
1
ESE
9
0.9
ESE
10
0.8
ESE
10
0.6
ESE
10
0.5
ESE
9
0.4
ESE
9
0.4
SE
10
Wave Graph
Metric surfscale
Energy kJ
77
70
45
69
86
85
77
111
161
175
96
105
168
173
128
72
46
30
26
Wind (km/h)
10
N
20
NNE
10
ENE
15
N
15
NE
15
ENE
10
NNE
15
ENE
10
ESE
15
NE
15
NE
15
ENE
10
NNE
10
NE
10
SE
5
ESE
5
SE
10
S
5
WSW
Wind State
cross-off
cross-off
cross-on
cross-off
cross-off
cross
cross-off
cross
cross-on
cross
cross
cross-on
cross-off
cross
on
glassy
glassy
cross-on
cross-off
High Tide
4:10AM1.55m
5:55PM1.48m
4:59AM1.57m
6:17PM1.48m
5:45AM1.54m
6:38PM1.48m
6:30AM1.47m
6:58PM1.47m
7:14AM1.36m
7:18PM1.46m
8:00AM1.24m
7:37PM1.44m
Low Tide
10:44PM0.87m
11:08AM0.03m
11:20PM0.74m
11:43AM0.11m
11:56PM0.62m
12:15PM0.24m
00:33AM0.52m
12:43PM0.39m
1:10AM0.46m
1:08PM0.55m
1:49AM0.43m
1:29PM0.70m
2:31AM0.45m
thunderstorm
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:00
5:01
5:01
5:03
5:03
5:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:36
6:35
6:34
6:32
6:31
6:30
6:29
 mm
2
3
4
3
2
1
2
Temp °C
25
29
28
26
28
28
26
27
28
26
29
28
25
28
27
25
27
28
25
Feels °C
28
30
31
29
30
30
29
29
30
28
29
29
26
28
28
29
29
30
28
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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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