Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 8 am 23 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.1°C
0.2° 

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 23 Aug 2026:

  • Best quality surf: Monday 24 Aug, 9PM (local time) - 5ft (1.5m), 15s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Tuesday 25 Aug, 3AM (local time) - 5ft (1.6m), 14s period, SSE swell with 1,045 kJ wave energy.
  • Next surfable swell (1★+): Monday 24 Aug, 12AM (local time) - 1.5ft (0.5m), 13s period with SE 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 Monday (Aug 24) at 12AM. The primary swell is predicted to be 0.5m and 13s period with a secondary swell of 0.3m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Hanamizu River in the next 16 days are 1.6m 14s and forecast to arrive on Tuesday (Aug 25) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Mon 24th Aug)1.5ft (0.5m) 13s
Best Surf 9PM (Mon 24th Aug)5ft (1.5m) 15s
Most Powerful 3AM (Tue 25th Aug)5ft (1.6m) 14s

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


The Lowdown

Alright, crew, Rusty here to break it down for Hanamizu River over the next 16 days. It’s a slow start, but there’s a couple of windows that are gonna scratch the itch.

Right now, it’s tiny and messy. The water’s a warm 81°, which is pretty average for this time of year, so no drama there.

The one that really stands out is Monday, August 24th. The morning session is a glassy dream. We’ve got a 2ft swell from the SSE, but the real story is the 18-second period – that’s a deep-water groundswell packing some punch (477 combined energy). And the wind is glass. Total calm. For a beginner-friendly spot, that’s about as clean as it gets. The long period might make it a bit fat over the sandbar, so look for the deeper lines. And yeah, it can get a few people out there sometimes.

The afternoon of the 24th bumps up to 3ft with even more energy (890), but the wind shifts cross-onshore, so the morning is your window.

Tuesday the 25th has a bit more size, around 5ft from the SSE, but the cross-onshore wind chops it up. The energy is there, but the quality isn’t.

Then we hit a long flat spell. From the 26th of August through the end of the month, it’s small, weak, and poorly winded. A few days, like the 27th morning, have a clean cross-offshore breeze, but the swell is a pathetic 2ft. Not worth it.

We get a pulse on Tuesday, September 1st. The afternoon shows a clean 4ft S swell with a 13-second period and a cross-offshore breeze (506 combined energy). That’s a solid second-week option. The morning of the 1st is a bit onshore, but it cleans up nicely later.

The 2nd and 3rd of September keep the 4ft to 4ft size going, but the winds are stronger and more cross-shore, so it’s only marginal. The energy is building, though (up to 814 combined energy on the 3rd afternoon).

Then a big one hits on September 5th. A solid 7ft SSW swell, but with a short 13-second period and a nasty 22 mph cross-onshore wind. That’s a lumpy, blown-out mess. The energy is massive (2792), but it’s not for paddling. With that much wind and size on a beach break, this is way more of a kite-surfing day than a surf day.

It settles back down after that. The 7th of September finishes with a tiny, glassy 3ft day, but the energy is low (220). A pretty way to end, but not much to ride.

So, bottom line: lock in the morning of Monday, August 24th for that rare glassy groundswell. The afternoon of Tuesday, September 1st is your best long-range bet. The rest is a whole lot of waiting.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sun afternoon. Warm (max 32°C on Tue afternoon, min 25°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 14mm), heaviest on Fri morning. Warm (max 31°C on Wed morning, min 23°C on Thu night). Wind will be generally light.

Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
AM
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
1
2
0
3
2
1
2
1
1
1
1
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)
0.4
SSW
9
0.3
SE
13
0.5
SE
13
0.6
SSE
18
0.9
SSE
17
1.4
SSE
14
1.4
SSE
13
1.4
S
13
1.3
S
13
1
S
12
1.6
SSW
13
0.8
SSW
12
0.6
SSW
11
0.6
S
8
0.6
S
8
0.6
S
8
0.9
SSW
8
0.6
SSW
10
0.7
SSW
10
0.6
S
9
0.5
S
8
Wave Graph
Metric surfscale
Energy kJ
25
27
82
260
486
756
722
653
560
276
786
161
84
51
50
51
109
71
102
60
36
Wind (km/h)
10
ENE
10
S
5
WSW
5
SSE
15
S
10
WSW
10
SSW
10
SSW
10
WSW
10
SSW
15
SW
15
SW
15
WSW
10
S
10
WSW
5
NE
10
SSW
10
NNW
20
NNE
5
NE
15
N
Wind State
cross-on
cross-on
glassy
glassy
cross-on
cross-off
cross-on
cross-on
cross-off
cross
cross
cross-off
cross-off
cross-on
cross-off
cross
cross
cross-off
cross-off
cross
cross-off
High Tide
4:23PM1.21m
00:27AM1.21m
4:23PM1.27m
1:56AM1.27m
4:35PM1.33m
2:52AM1.35m
4:51PM1.38m
3:36AM1.42m
5:08PM1.43m
4:16AM1.47m
5:27PM1.46m
4:55AM1.50m
5:46PM1.49m
Low Tide
8:28PM1.14m
8:39AM0.38m
9:13PM1.05m
9:21AM0.30m
9:43PM0.96m
9:55AM0.23m
10:11PM0.85m
10:25AM0.20m
10:39PM0.74m
10:54AM0.20m
11:08PM0.63m
11:22AM0.24m
11:38PM0.52m
part cloud
thunderstorm
clear
clear
clear
part cloud
clear
part cloud
thunderstorm
clear
clear
part cloud
rain showers
cloud
mod rain
mod rain
clear
part cloud
cloud
light rain
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:07
5:07
5:09
5:09
5:09
5:11
5:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:22
6:21
6:20
6:19
6:17
6:15
6:15
 mm
1
1
2
6
6
1
1
Temp °C
27
27
26
28
29
27
30
32
26
31
31
28
28
29
26
24
26
26
27
26
24
Feels °C
30
29
30
30
32
30
32
35
28
33
32
30
31
33
29
27
29
30
28
29
26
  • 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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