Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 8 am 18 Jul 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
25.2° C
0.4° 

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 Jul 2026:

  • Most powerful swell: Tuesday 21 Jul, 6PM (local time) - 2.5ft (0.8m), 4s period, SSW swell with 26 kJ wave energy.

Best Forecast Surf Conditions for Hanamizu River this week:

The most powerful waves expected at Hanamizu River in the next 16 days are 0.8m 4s and forecast to arrive on Tuesday (Jul 21) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 6PM (Tue 21st Jul)2.5ft (0.8m) 4s

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 Hanamizu River has in store for us over the next couple of weeks.

It's a pretty quiet start, I'm not gonna lie. For the first week or so, from today right through to the end of July, there's just nothing happening. Tiny junky windswell, mostly cross-onshore, and the wave comment is "poor surf conditions" across the board. The swell energy is basically non-existent, with values like 17, 19, 28, all well under 100. You'd be wasting your time paddling out. There's a solid gap here of quiet conditions until we get toward the end of the month.

Now, things do start to change around the 27th of July. On Monday the 27th, the energy finally starts to build with a combined energy of 880, and we see a 4ft SSE swell at a solid 16-second period – that's proper groundswell. However, winds are light cross-onshore in the morning, so it's only marginal. It's a tease of what's coming, but not the best.

The standout period is the end of July. Wednesday the 29th is the one that really has my attention. The swell is a hefty 12ft from the S with a 16-second period, and the combined energy is a massive 5559. That's serious power. The finder notes the wind and tide are favorable, but it also says the swell is predicted to be too big for this break. For Hanamizu River, a sandbar break, that's a major caveat. This is only for the experts, and even then, it might be too much for the setup. A long-period groundswell like this, over 15 seconds, can make a beach break close out and break too straight.

Then, on Thursday the 30th of July, we have a morning that looks absolutely glassy with a 10ft S swell. The energy is still massive at 3996, and the wind is glass. The finder calls it "excellent surf conditions for experienced surfers." That is the session to target if you are a capable surfer. It is a big, powerful swell, over 8ft, so it's strictly for the experts, but that glassy wind and big groundswell is a rare combination.

Crowds at Hanamizu River are marked as "sometimes", so you can expect a few others out for these rare, epic conditions, especially on the Thursday morning. The water temperature is around 77°F and the anomaly is -0.7°F, so pretty average for this time of year, nothing unusual.

After that big pulse, the first of August looks messy and windy with strong SSE winds, so it falls apart pretty quickly. A short window, but a powerful one.

Stay safe out there.
Rusty.

Short Range Forecast

Mostly dry. Warm (max 30°C on Mon afternoon, min 25°C on Sat night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Tue afternoon. Warm (max 30°C on Tue morning, min 24°C on Thu night). Wind will be generally light.

Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
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
0
0
0
0
0
0
0
0
0
0
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
SE
9
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.7
S
4
0.2
S
8
0.2
SSE
9
0.7
S
4
0.6
SSW
4
0.6
SW
4
0.7
SSW
4
0.6
SSW
4
0.3
SSW
4
0.2
SSE
7
0.4
SSW
4
0.2
SSE
10
0.2
SSE
10
0.3
SE
10
0.2
SSE
9
0.2
SSE
9
0.3
SE
11
Wave Graph
Metric surfscale
Energy kJ
12
11
10
9
12
5
7
13
14
14
17
15
4
5
6
15
10
15
12
11
18
Wind (km/h)
10
SSE
15
S
10
S
10
SSE
20
SSE
10
W
5
SE
15
S
10
W
5
S
15
S
10
WNW
5
SSE
15
S
5
NNW
15
ENE
10
S
10
ENE
5
ESE
10
S
5
SSW
Wind State
on
cross-on
cross-on
cross-on
cross-on
cross-off
on
cross-on
cross-off
cross-on
cross-on
cross-off
on
cross-on
cross-off
cross-on
cross-on
cross-on
on
cross-on
cross-on
High Tide
7:58PM1.42m
7:26AM1.35m
8:23PM1.40m
8:21AM1.23m
8:47PM1.39m
9:26AM1.10m
9:12PM1.37m
10:59AM1.01m
9:42PM1.35m
1:53PM1.02m
10:23PM1.31m
4:27PM1.11m
11:26PM1.28m
Low Tide
1:19PM0.24m
1:45AM0.69m
1:50PM0.42m
2:33AM0.63m
2:19PM0.59m
3:26AM0.59m
2:44PM0.76m
4:27AM0.55m
3:05PM0.90m
5:40AM0.52m
3:14PM1.02m
6:57AM0.47m
5:02PM1.11m
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
clear
thunderstorm
thunderstorm
part cloud
part cloud
thunderstorm
part cloud
rain showers
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:39
4:41
4:41
4:41
4:43
4:43
4:45
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:57
6:55
6:54
6:54
6:53
6:53
6:52
 mm
1
2
1
2
2
1
4
Temp °C
27
27
26
27
28
27
29
30
28
30
30
29
30
29
29
28
29
26
26
27
25
Feels °C
30
29
29
30
30
31
33
34
32
34
33
33
35
33
34
32
33
30
30
30
29
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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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