Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 8 pm 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.9°C
1.0° 

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 30 Aug 2026:

  • Best quality surf: Thursday 3 Sep, 3AM (local time) - 3.5ft (1.0m), 5s period, S swell with cross-offshore winds.
  • Most powerful swell: Thursday 3 Sep, 12PM (local time) - 3ft (0.9m), 8s period, S swell with 104 kJ wave energy.
  • Next surfable swell (1★+): Thursday 3 Sep, 3AM (local time) - 3.5ft (1.0m), 5s period with S 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 Thursday (Sep 03) at 3AM. The primary swell is predicted to be 1.0m and 5s period with a secondary swell of 0.1m and 9s. Another secondary swell of 0.1m and 10s 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 0.9m 8s and forecast to arrive on Thursday (Sep 03) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Sep 04) at 9PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Thu 3rd Sep)3.5ft (1.0m) 5s
Best Surf 3AM (Thu 3rd Sep)3.5ft (1.0m) 5s
Most Powerful12PM (Thu 3rd Sep)3ft (0.9m) 8s

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


The Lowdown

Alright, weather looks a bit small and messy to start, but things are shaping up for some big clean action in the second week. Let’s get into it.

First up, straight from the start of the period on Sunday the 30th of August, we’ve got flat to tiny waves at the Hanamizu River (beach/sandbar). The water temp is running about 1.0° warmer than normal for this time of year, coming in at 28°, so a degree or two toastier. Not much surf to get excited about though. From Sunday afternoon through to the middle of the first week, swell is hanging between 1ft and 2ft, and it’s mostly from the SSW, which is not the optimum direction (SE is) for this spot. Winds are often cross or onshore, and the energy is weak. We’re looking at combined swell energy values in the 21 to 68 range. Basically, for the first six days, everything’s a no-go.

The poor run drags on through to the 6th of September, Sunday morning, when we finally see a pulse of energy hit – still only 3ft from SSE, but the period jumps to 13 seconds. The combined energy leaps to 395, and there’s a cross-off wind from the NNE with clean conditions. That’s the first hint of something decent, but combined swell energy is only moderate, so it’s more of a hopeful sign than a standout. The wind cleans it up though. You’ll get some smaller clean lines, but not a day to clear the diary.

Now, hold on – the real standout is coming. On Wednesday the 9th of September, the Hanamizu River sees a proper pulse. Morning session gets an 8ft SSE swell at 13 seconds, with clean cross-off wind from the NNE at 15 km/h. Combined swell energy hits 2215 – that’s strong wave energy. The swell direction is SSE, which works for the optimum SE direction. Water temp is going to be similar, around 28°, and winds are light and offshore. That’s the best call of the whole run. But at 8ft, this is for experienced surfers only – beginners stay out of the water. The river mouth should handle this well, with that long period groundswell. Thursday the 10th also has size – 8ft morning, 6ft afternoon – with clean cross-off wind again, but the morning has strong winds at 25 km/h, so Wednesday morning is the winner.

After that, it drops back from Friday the 11th onward into smaller stuff, below 4ft through the 14th, and the conditions turn questionable again with onshore light rain on the final days.

So if you’re picking one window, it’s the morning of Wednesday 9th September. That’s your moment.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 28°C on Wed morning, min 24°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 41mm), heaviest during Sat morning. Warm (max 30°C on Thu afternoon, min 20°C on Fri night). Wind will be generally light.

Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
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
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
7
0.3
SSW
7
0.3
SSW
7
0.3
SSW
9
0.2
E
12
0.3
SSW
9
0.3
SSW
8
0.3
SSW
8
0.4
SSW
8
0.6
S
8
0.8
S
6
0.5
SSW
9
0.6
SSE
7
0.5
SSE
7
0.4
SSE
7
0.4
SE
7
0.3
SSW
8
0.2
SSW
8
0.3
SE
9
Wave Graph
Metric surfscale
Energy kJ
11
10
11
15
14
15
14
13
22
50
46
50
33
27
19
14
13
6
14
Wind (km/h)
5
NE
10
NE
10
ESE
15
NNE
10
ENE
5
S
5
SW
10
SSE
20
S
10
WSW
10
SSW
20
SSW
5
W
20
NE
20
NNE
20
NNE
20
N
25
NNE
25
N
Wind State
cross
cross
cross-on
cross-off
cross
cross-on
cross
cross-on
cross-on
cross-off
cross-on
cross-on
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
6:13AM1.47m
6:25PM1.51m
6:56AM1.40m
6:47PM1.51m
7:44AM1.31m
7:09PM1.49m
8:44AM1.20m
7:34PM1.45m
10:22AM1.10m
8:03PM1.40m
8:45PM1.32m
Low Tide
00:10AM0.43m
12:17PM0.43m
00:44AM0.36m
12:44PM0.57m
1:22AM0.32m
1:10PM0.72m
2:06AM0.32m
1:35PM0.87m
3:03AM0.35m
1:53PM1.01m
4:23AM0.38m
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
light rain
thunderstorm
part cloud
thunderstorm
light rain
light rain
mod rain
heavy rain
mod rain
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:13
5:13
5:15
5:16
5:16
5:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:14
6:12
6:10
6:08
6:07
6:07
6:05
 mm
4
2
1
2
1
10
12
9
Temp °C
25
27
27
26
27
27
26
28
28
27
29
30
27
23
22
22
20
20
21
Feels °C
28
30
30
27
29
29
29
30
30
30
32
31
30
23
21
21
19
19
19
  • 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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