Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 2 pm 26 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.7°C
0.8° 

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


Hanamizu River surf forecast from 26 Aug 2026:

  • Best quality surf: Wednesday 2 Sep, 12AM (local time) - 4ft (1.2m), 12s period, S swell with glassy winds.
  • Most powerful swell: Wednesday 2 Sep, 3AM (local time) - 4ft (1.2m), 12s period, SSW swell with 461 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 26 Aug, 9PM (local time) - 2ft (0.6m), 11s period with SSW swell.

Best Forecast Surf Conditions for Hanamizu River this week:

The surf forecast for Hanamizu River over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 26) at 9PM. The primary swell is predicted to be 0.6m and 11s period with a secondary swell of 0.4m and 9s. Another secondary swell of 0.9m and 5s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Hanamizu River in the next 16 days are 1.2m 12s and forecast to arrive on Wednesday (Sep 02) at 3AM. 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 Monday (Aug 31) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Wed 26th Aug)2ft (0.6m) 11s
Best Surf12AM (Wed 2nd Sep)4ft (1.2m) 12s
Most Powerful 3AM (Wed 2nd Sep)4ft (1.2m) 12s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it.

Right off the bat, I gotta be honest with you – the next week or so is looking pretty flat and disappointing. We’ve got a big gap of small, weak energy with hardly any quality on offer. The first real chance to get wet doesn’t come until the start of next week, but there’s a real standout hiding in the second week that’s worth waiting for.

The standout is Monday, September 7th, morning. That’s the one to circle on your calendar. Hanamizu River will be seeing a solid 6 ft swell from the south, with a long period of 14 seconds, giving it real groundswell grunt. The combined energy is strong at 1369, and with a light NNE cross-offshore breeze, it’s going to be clean. The water temp is 82°F, which is about normal for this time of year. This is expert territory – anything over 5 ft is already pushing it for beginners, and at 6 ft, it’s a proper session for experienced surfers only. The long period means more power and longer lulls between sets, which helps paddling, but at a river mouth, that long period can make things a little straight. Still, it’s the best on offer.

Leading up to that, we’ve got days of nothing. Wednesday the 26th through to the end of the month is mostly small, weak, and messy. The best you’ll get is a brief glassy window on Friday the 28th afternoon with a tiny 2 ft south swell, but that’s barely surfable. The combined energy is weak at 110, so it’s more of a float than a ride.

The first week of September starts slow too. Tuesday the 1st has a 1 ft glassy morning, but the energy is minimal at 80. Then Wednesday the 2nd brings a bump in size – 5 ft on the morning, 6 ft in the afternoon, with a very long period of 16 seconds and strong energy (1267 and 1332). But the SSW cross-onshore winds will chop it up, and the conditions are poor. It’s a lot of water moving with nowhere to go clean. For kite surfers, that’s probably more interesting than paddle surfing.

After the Monday standout, Tuesday the 8th still has good leftovers – 6 ft south swell, clean with NNE cross-offshore winds, and combined energy of 852. That’s a solid session for those who missed the Monday peak. Wednesday the 9th morning drops to 4 ft but stays glassy, which is a nice clean surf for the experienced crew.

Beyond that, things fade off again. The second week outlook is mostly small and weak, with no other standouts.

So, hold out for that Monday, September 7th dawn patrol. It’s the real deal.

Rusty.

Short Range Forecast

Moderate rain (total 14mm), heaviest on Thu afternoon. Warm (max 32°C on Wed afternoon, min 24°C on Thu afternoon). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 7mm), mostly falling on Sat night. Warm (max 28°C on Sun afternoon, min 23°C on Sat night). Wind will be generally light.

Wed
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
0
0
1
1
0
0
0
0
0
0
1
0
0
1
0
0
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
SSW
12
0.5
SSW
11
0.8
SSW
6
0.5
S
11
0.5
S
10
0.9
SSW
6
0.9
SW
6
0.5
SSW
5
0.4
SSW
8
0.3
SSW
8
0.3
SSW
8
0.3
SSW
8
0.8
SSW
5
1.2
SSW
6
0.3
SSW
14
0.3
SSW
12
0.7
S
10
0.8
S
13
1
S
12
1.2
S
12
Wave Graph
Metric surfscale
Energy kJ
137
68
36
55
45
61
54
16
20
12
12
11
31
103
36
30
98
202
295
453
Wind (km/h)
15
SW
10
WSW
5
SSW
25
NNE
15
WSW
5
S
5
SE
5
N
5
ENE
0
W
10
NNE
5
SSW
10
S
5
W
20
NE
10
NNE
10
NNE
15
NE
10
ESE
5
SE
Wind State
cross-off
cross-off
glassy
cross-off
cross-off
glassy
glassy
cross-off
cross
glassy
cross-off
glassy
cross-on
glassy
cross
cross-off
cross-off
cross
cross-on
glassy
High Tide
4:51PM1.38m
3:36AM1.42m
5:08PM1.43m
4:16AM1.47m
5:27PM1.46m
4:55AM1.50m
5:46PM1.49m
5:33AM1.50m
6:05PM1.51m
6:13AM1.47m
6:25PM1.51m
6:56AM1.40m
6:47PM1.51m
Low Tide
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
clear
part cloud
thunderstorm
thunderstorm
mod rain
cloud
cloud
part cloud
cloud
light rain
light rain
part cloud
clear
cloud
light rain
cloud
rain showers
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:09
5:11
5:11
5:13
5:13
5:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:19
6:17
6:15
6:15
6:14
6:12
6:10
 mm
3
5
6
1
3
1
2
3
Temp °C
32
28
29
26
25
27
28
27
26
24
23
25
28
27
24
24
24
28
29
26
Feels °C
35
31
34
26
26
31
32
31
28
28
25
28
32
31
26
27
26
30
31
30
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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 Hanamizu River Surf forecast

The above surf forecast table for Hanamizu River provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Hanamizu River can be found by selecting the local surf guide option on the grey menu. Our Hanamizu 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 (Hanamizu 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 Hanamizu 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.

Hanamizu River is 1 km (1 miles) from Ninomiya. If you plan a holiday in Kanagawa, look for hotels and other accommodation in Ninomiya. Ninomiya has rooms for a wide range of budgets as well as car hire and transport links.

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