Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 2 pm 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.1° C
0.1° 

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 18 Aug 2026:

  • Best quality surf: Tuesday 25 Aug, 6PM (local time) - 3.5ft (1.1m), 13s period, SSE swell with glassy winds.
  • Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 3.5ft (1.1m), 13s period, SSE swell with 384 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 12AM (local time) - 1.5ft (0.5m), 10s 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 Saturday (Aug 22) at 12AM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.1m and 10s. Another secondary swell of 0.4m and 3s 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 1.1m 13s and forecast to arrive on Tuesday (Aug 25) at 6PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 3s period and expected on Saturday (Aug 22) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Sat 22nd Aug)1.5ft (0.5m) 10s
Best Surf 6PM (Tue 25th Aug)3.5ft (1.1m) 13s
Most Powerful 6PM (Tue 25th Aug)3.5ft (1.1m) 13s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s happening for the next couple of weeks.

Right off the bat, it’s a slow start. The first week or so is pretty much a write-off. We’re looking at tiny, weak swell with cross-onshore winds and poor conditions. From Tuesday the 18th right through to the end of the following week, there’s nothing worth paddling out for. The swell height barely gets above 2ft, the energy is weak (29), and the wind is just messing things up. It’s a long gap of flatness.

The first real sign of life comes on Tuesday the 25th in the morning. A bit of a jump in swell to 3ft from the SSE, with a long period of 14 seconds, and the energy finally climbs into the moderate range (310). The wind is light and cross-shore, so it’s not perfect, but it’s a start. The wave comment says “marginal,” so don’t get too excited, but it’s the first thing we’ve seen.

Wednesday the 26th is where things get a bit more interesting. The swell is up to 5ft from the SSE, still a long 14-second period, and the energy is strong (827). The wind goes cross-offshore from the NNE, which will clean the waves up nicely. It’s still rated as “marginal” for the spot, but it’s the first real window of rideable, clean surf.

The standout window, and the best on offer, is Saturday the 29th in the morning. We get a 5ft SSW swell, with a very long 14-second period, and the energy is very strong (985). The wind is glassy from the SE – that’s a major positive. The wave comment says “expect very good surf conditions,” and for this spot, that’s the best we get. The water temperature is about 81°, which is pretty normal for this time of year. The only thing to watch is that the swell direction is SSW, and this break (Hanamizu River, beach/sandbar) likes swell from the SE, so the shape might not be perfect. But with that window of glassy wind and decent size, it’s the pick of the fortnight.

After that, it drops off again. Sunday the 30th and Monday the 31st see the swell back down to 3ft-3ft, with the wind turning back onshore and chopping things up. The energy is still moderate (350-400), but the quality is poor.

Into the first week of September, the swell drops right back. Tuesday the 1st and Wednesday the 2nd have some energy but fresh, onshore winds. It’s not looking good for a paddle.

So, to wrap it up: a long, flat start, then a promising window around the 25th-29th of August, with the absolute best chance being the glassy morning of Saturday the 29th. Get on it, because it doesn’t last.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 28°C on Wed afternoon, min 25°C on Tue night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 18mm), heaviest on Sat night. Warm (max 28°C on Fri afternoon, min 25°C on Sat night). Wind will be generally light.

Tue
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
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)
0.3
SSW
8
0.4
SE
6
0.4
SE
6
0.3
SSE
6
0.2
SSW
8
0.2
SSE
6
0.2
SSW
9
0.2
S
10
0.4
SSW
9
0.5
S
9
0.5
SSW
10
0.5
SSW
10
0.4
SSW
9
0.4
SSW
9
0.4
SSW
9
0.4
SSW
9
0.3
SSW
9
0.3
SE
10
0.3
SE
10
0.2
SSE
15
Wave Graph
Metric surfscale
Energy kJ
12
10
10
7
6
4
8
8
27
39
60
52
32
33
32
27
15
15
14
22
Wind (km/h)
10
S
5
W
10
ESE
10
S
5
W
10
SE
15
S
10
SW
10
SSE
20
S
5
W
5
ESE
10
S
10
NNW
10
NE
10
S
5
W
10
SSE
15
S
5
WNW
Wind State
cross-on
glassy
cross-on
cross-on
glassy
on
cross-on
cross
cross-on
cross-on
cross-off
glassy
cross-on
cross-off
cross
cross-on
cross-off
cross-on
cross-on
cross-off
High Tide
7:37PM1.44m
8:53AM1.12m
7:57PM1.41m
10:11AM1.02m
8:20PM1.36m
8:48PM1.29m
9:51PM1.23m
4:23PM1.21m
00:27AM1.21m
4:23PM1.27m
1:56AM1.27m
Low Tide
2:31AM0.45m
1:44PM0.83m
3:21AM0.48m
1:46PM0.94m
4:30AM0.52m
6:10AM0.53m
7:42AM0.47m
8:28PM1.14m
8:39AM0.38m
9:13PM1.05m
part cloud
clear
clear
clear
clear
part cloud
part cloud
clear
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:05
5:05
5:07
5:07
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:29
6:28
6:27
6:24
6:23
6:22
6:21
 mm
1
2
1
3
8
1
2
Temp °C
27
26
27
28
26
27
28
26
27
28
27
28
28
27
27
27
26
27
27
26
Feels °C
29
30
30
29
30
29
30
29
30
30
30
32
31
31
31
30
31
30
30
29
  • Map Icons:
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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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