Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 2 pm 16 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.5° C
0.5° 

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 16 Aug 2026:

  • Best quality surf: Friday 21 Aug, 9PM (local time) - 2.5ft (0.8m), 11s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Friday 21 Aug, 6PM (local time) - 2.5ft (0.8m), 11s period, SSW swell with 135 kJ wave energy.
  • Next surfable swell (1★+): Friday 21 Aug, 9PM (local time) - 2.5ft (0.8m), 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 Friday (Aug 21) at 9PM. The primary swell is predicted to be 0.8m and 11s period with a secondary swell of 0.1m and 10s. Another secondary swell of 0.7m and 4s 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 0.8m 11s and forecast to arrive on Friday (Aug 21) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 2s period and expected on Sunday (Aug 23) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Fri 21st Aug)2.5ft (0.8m) 11s
Best Surf 9PM (Fri 21st Aug)2.5ft (0.8m) 11s
Most Powerful 6PM (Fri 21st Aug)2.5ft (0.8m) 11s

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


The Lowdown

Alright, surf’s been dead quiet for a while around Hanamizu River, but there’s a light at the end of the tunnel. We’ve got a pretty long stretch of tiny, weak, messy surf from now through the 23rd of August – nothing worth paddling out for. But hang tight, because late in the month, the ocean finally wakes up.

Water temp is sitting right around 82°F, which is pretty standard for this time of year – nothing to write home about.

First real hope comes in the morning of Monday the 24th. Swell is still small at 1 ft from the SE, but that period jumps to 13 seconds and the wind goes light cross-off. That’s clean for the first time in ages. The combined energy is still only moderate (104), but it’s surfable and way better than what we’ve been looking at.

The standout window is Tuesday the 25th through Thursday the 27th. Tuesday morning brings 3 ft SSE swell with a 15-second period, light cross-off wind, and the energy jumps to 419. That’s proper groundswell. This is the best quality on offer, and it’s clean. Wednesday morning the 26th is the real gem though – 3 ft SSE swell, 16-second period, glassy wind, and the energy is up at 728. That’s the one you want to clear your schedule for. Smooth, glassy, long-period groundswell. Perfect for a sandbar break like this, though the long period will mean longer waits between sets.

From the 27th into the 30th, the swell builds steadily, but so does the wind. We’re looking at 6 ft to 10 ft from the SSE and S, with periods still long at 15-16 seconds. But the wind is mostly cross-on or onshore, and the waves get choppy or messy. This is pushing into expert territory – over 8 ft, only for the strong paddlers. The energy readings are off the charts (over 5000 by the 30th) but the conditions aren’t doing it justice.

By the 31st of August, the swell is enormous – 21 ft in the morning from the SSE with 16-second period. That’s massive, and the energy is 19071. But honestly, this break is just too exposed and too small for that kind of size. It’s going to be a washing machine. Cross-shore wind at 12 mph won’t help either. This is straight-up for experts only, and even then, it’s probably more of a kitesurfing setup than a paddle session.

So to wrap it up – your best bet is the morning of the 26th. That’s the standout: glassy, clean, 3 ft groundswell, long period, decent energy. Get out there early.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sun afternoon. Warm (max 28°C on Tue morning, min 24°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

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

Sun
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
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
0
0
0
0
0
0
1
0
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)
0.5
S
9
0.5
S
9
0.4
S
9
0.6
ESE
8
0.3
SSW
8
0.2
SSW
8
0.3
SE
7
0.4
SE
7
0.3
SE
6
0.2
SSE
6
0.2
SSW
8
0.2
S
11
0.3
SSW
10
0.4
SSW
9
0.5
S
8
0.6
SSW
11
0.7
SSW
11
0.6
SSW
10
0.5
SSW
10
0.5
SSW
10
Wave Graph
Metric surfscale
Energy kJ
39
37
23
48
13
6
7
12
6
4
6
9
19
26
37
95
103
80
56
54
Wind (km/h)
15
ESE
10
NNE
10
NE
10
S
5
N
10
NE
10
SSE
0
SE
5
E
10
SSE
5
SSW
5
ESE
10
S
5
SW
10
SSE
20
S
10
WSW
5
S
20
S
10
WSW
Wind State
cross-on
cross-off
cross
cross-on
glassy
cross
cross-on
glassy
cross-on
cross-on
glassy
on
cross-on
cross
on
cross-on
cross-off
cross-on
cross-on
cross-off
High Tide
6:58PM1.47m
7:14AM1.36m
7:18PM1.46m
8:00AM1.24m
7:37PM1.44m
8:53AM1.12m
7:57PM1.41m
10:11AM1.02m
8:20PM1.36m
8:48PM1.29m
9:51PM1.23m
Low Tide
1:10AM0.46m
1:08PM0.55m
1:49AM0.43m
1:29PM0.70m
2:31AM0.45m
1:44PM0.83m
3:21AM0.48m
1:46PM0.94m
4:30AM0.52m
6:10AM0.53m
rain showers
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:03
5:03
5:05
5:05
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:30
6:30
6:29
6:28
6:27
6:24
6:23
 mm
1
1
Temp °C
27
26
27
27
26
28
28
26
27
28
26
27
28
26
27
28
26
27
29
26
Feels °C
28
29
30
29
30
30
30
30
30
30
30
29
30
29
30
30
28
30
30
28
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  • 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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