Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 8 am 04 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.9° C
1.2° 

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 4 Aug 2026:

  • Best quality surf: Friday 7 Aug, 6AM (local time) - 7ft (2.2m), 15s period, S swell with cross-offshore winds.
  • Most powerful swell: Wednesday 5 Aug, 12PM (local time) - 7.5ft (2.3m), 15s period, SSE swell with 2,432 kJ wave energy.
  • Next surfable swell (1★+): Friday 7 Aug, 6AM (local time) - 7ft (2.2m), 15s 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 Friday (Aug 07) at 6AM. The primary swell is predicted to be 2.2m and 15s period with a secondary swell of 1.0m and 10s. 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 2.3m 15s and forecast to arrive on Wednesday (Aug 05) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Wednesday (Aug 05) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Fri 7th Aug)7ft (2.2m) 15s
Best Surf 6AM (Fri 7th Aug)7ft (2.2m) 15s
Most Powerful12PM (Wed 5th Aug)7.5ft (2.3m) 15s

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


The Lowdown

Alright folks, Rusty here. Let’s take a proper look at what the ocean’s got cookin’ for us at Hanamizu River over the next couple of weeks. Gotta be straight with you – it’s a bit of a slow burner. The first solid opportunity doesn’t roll in until Tuesday the 4th of August, so don’t go paddling out before then expecting much.

Alright, so for the opening act on Tuesday morning, the 4th, we’ve got some southeast groundswell wrapping in at 5ft with a juicy 17-second period. That’s proper long-period energy, the kind that lines up nicely on a river mouth like this. The combined energy is pretty hefty (1098), so there’s some grunt behind it. Wind is a moderate breeze from the NNE, which is a clean cross-offshore – that’s a major positive for keeping the surface glassy. Water temp is sitting at 82°F, about 2°F warmer than usual, so it’s a touch balmy out there. This is the standout of the whole run, honestly. It’s the only time the stars really align for a decent session.

Now, the rest of that week and into the next is a real struggle. The swell hangs around in the 5ft to 8ft range through Wednesday and Thursday, but the wind is a constant problem – mostly cross-onshore or onshore, chopping everything up. By Friday the 7th, we’ve got rain showers adding to the messy picture. The swell sticks around but the quality just isn’t there. It’s a lot of energy (we’re seeing values over 2000) being wasted by poor conditions. This setup would actually look more interesting for the kite surfers than paddle surfers, to be honest.

After the 9th of August, it’s a long dry spell. From Monday the 10th through to about the 19th of August, the swell drops right off – down to 1ft to 3ft – and the winds are mostly cross or onshore. The combined energy drops to under 200 most days, which is weak stuff. There’s a brief moment on the morning of the 12th of August where it’s glassy with a 3ft swell, but it’s just too small and weak to get excited about. The rest of that period is a write-off for any kind of decent wave. It’s a real blank run for the area, and that’s just how it goes sometimes.

So, to wrap it up: your one and only real shot is Tuesday morning, the 4th of August at Hanamizu River. Go get it, but don’t expect much after that.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Thu afternoon. Warm (max 30°C on Thu morning, min 23°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Fri night. Warm (max 30°C on Sun afternoon, min 23°C on Sun night). Wind will be generally light.

Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
3
3
1
3
2
2
3
3
3
4
2
1
3
2
1
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)
1.4
SE
17
1.7
SE
16
2.1
SE
16
2.2
SSE
16
2.4
SSE
15
2.2
SSE
14
2.2
SSE
14
2.2
S
14
2.2
S
14
2.1
S
15
2
S
15
1.7
SSW
14
1.6
SSW
14
1.6
SSW
14
1.5
SSW
14
1.5
SSW
14
1.2
SSW
14
1.2
SSW
16
1
SSW
16
0.9
SSW
16
0.6
SW
15
Wave Graph
Metric surfscale
Energy kJ
1094
1464
2107
2379
2414
1835
1665
2012
1972
1881
1739
1189
1060
1030
874
899
534
674
499
425
171
Wind (km/h)
25
NE
25
ENE
20
NNE
25
NNE
15
E
15
NE
15
NE
10
SE
10
NE
10
ENE
10
SSE
5
E
10
ESE
15
S
5
NE
15
NE
15
E
30
NNE
30
NNE
30
NNE
20
N
Wind State
cross-off
cross-on
cross-off
cross-off
cross-on
cross
cross
on
cross
cross
on
glassy
cross-on
cross-on
glassy
cross
cross-on
cross-off
cross-off
cross-off
cross-off
High Tide
8:05PM1.45m
8:47AM1.18m
8:33PM1.43m
10:12AM1.09m
9:05PM1.40m
12:46PM1.07m
9:50PM1.36m
3:24PM1.19m
11:07PM1.33m
4:05PM1.31m
00:49AM1.35m
4:36PM1.39m
2:12AM1.41m
Low Tide
1:44PM0.55m
2:41AM0.50m
2:14PM0.72m
3:38AM0.47m
2:45PM0.88m
4:53AM0.43m
3:24PM1.05m
6:23AM0.36m
5:48PM1.18m
7:47AM0.25m
8:17PM1.17m
8:52AM0.13m
9:22PM1.10m
clear
clear
part cloud
part cloud
clear
part cloud
clear
thunderstorm
thunderstorm
clear
clear
thunderstorm
clear
clear
rain showers
part cloud
part cloud
part cloud
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:52
4:54
4:54
4:54
4:56
4:56
4:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:44
6:43
6:42
6:40
6:39
6:38
6:37
 mm
1
3
1
1
1
Temp °C
28
29
24
28
29
27
30
30
27
29
29
27
28
29
26
29
30
26
28
29
25
Feels °C
26
27
23
28
30
29
33
33
32
31
32
31
31
31
31
29
30
25
25
26
22
  • Map Icons:
  • Break
  • 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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