Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 2 am 03 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.9° C
1.3° 

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 3 Aug 2026:

  • Best quality surf: Friday 7 Aug, 3AM (local time) - 8ft (2.5m), 15s period, S swell with cross-offshore winds.
  • Most powerful swell: Wednesday 5 Aug, 12PM (local time) - 8ft (2.5m), 16s period, SSE swell with 3,786 kJ wave energy.
  • Next surfable swell (1★+): Friday 7 Aug, 3AM (local time) - 8ft (2.5m), 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 3AM. The primary swell is predicted to be 2.5m and 15s period with a secondary swell of 1.9m 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 2.5m 16s and forecast to arrive on Wednesday (Aug 05) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Wednesday (Aug 05) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Fri 7th Aug)8ft (2.5m) 15s
Best Surf 3AM (Fri 7th Aug)8ft (2.5m) 15s
Most Powerful12PM (Wed 5th Aug)8ft (2.5m) 16s

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


The Lowdown

Alright, surfers, Rusty here. Let’s get into it. The long-range models are showing something for the Hanamizu River mouth, but it’s going to take a while to get going. The first week is looking pretty average, but there’s one standout window if you’ve got the patience and the skills. Water temp is running a touch warmer than usual for this time of year, sitting at 82°F, which is nice.

The surf starts out pretty weak. Monday and Tuesday the 3rd and 4th are looking marginal, with small, clean-ish waves in the morning but nothing to get too excited about. The swell energy is still weak to moderate. The wind is cross-off but a bit fresh, so it’s not going to be perfect.

We’ve got a bit of a gap through the middle of the week with no real quality. Wednesday the 5th sees a jump in size to 8ft, but the swell direction is a bit off and the energy is moderate. It’s still pretty cross-shore and choppy, so not the pick. Thursday the 6th is similar size, but the winds get messy – onshore Thursday afternoon – so you’d be fighting it. Honestly, Thursday afternoon is not worth your time.

Now, here’s where it gets interesting. Friday, August 7th is your standout. The morning looks excellent for experienced surfers. We’re looking at a solid 8ft of south swell, with a long 16-second period. That’s proper groundswell, and it’ll be wrapping into the river mouth. The wind is light, cross-off from the NNE, which should keep it glassy and clean. The energy is strong. This is the best combination of size, period, and wind we see in this whole outlook. Because it’s over 8ft, this is only for the experts out there – the beginners need to give this one a miss. This break is a beach/sandbar setup, so the long-period swell might make it a bit straight, but with that offshore wind, it could be worth the paddle.

The weekend is a step down. Saturday the 8th is still rideable with 6ft of south swell, but the wind turns more cross-on, making it a bit lumpy. It’s not terrible, but it’s a clear drop-off from Friday.

After that, the surf fades fast. From Sunday the 9th onwards, we’re looking at a real dry spell. Swell drops below 3ft pretty quickly and the energy just dies. For the rest of the 16-day window, the river mouth will be pretty flat and not worth the drive. The forecast looks poor for over a week, from the 9th through the 18th. It’s the kind of run that happens sometimes, but the good news is that this spot is generally fairly consistent, so a blank run like this doesn’t usually last forever.

So, in short: mark your calendar for the morning of Friday, August 7th. That’s the one. Get out there if you’re experienced and enjoy the clean 8ft groundswell. Otherwise, keep the board in the car for a while.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 28°C on Tue morning, min 22°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 21mm), heaviest during Thu afternoon. Warm (max 30°C on Thu morning, min 25°C on Sat night). Wind will be generally light.

Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
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
1
2
1
0
3
2
2
3
2
2
3
4
3
4
3
2
2
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)
0.7
SE
16
0.9
SE
16
1.1
SE
17
1.4
SE
17
1.8
SE
16
2.3
SE
16
2.5
SSE
16
2.5
SSE
16
2.5
SSE
15
2.5
S
15
2.5
S
16
2.5
S
16
2.5
S
16
2.3
S
15
1.9
S
14
1.9
S
14
1.8
S
14
1
SW
14
1
S
13
0.8
SW
15
0.8
SSW
14
Wave Graph
Metric surfscale
Energy kJ
258
448
772
1120
1611
2676
3731
3569
3115
3093
3588
3230
3025
2405
1463
1382
1208
390
335
266
243
Wind (km/h)
25
NNE
25
NNE
25
NNE
30
NNE
25
ENE
25
NNE
25
NNE
20
NE
20
NNE
20
NE
10
SE
15
NE
15
NNE
10
SE
5
NNE
10
E
15
S
10
ENE
25
NE
25
ENE
20
NNE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-on
cross-off
cross-off
cross
cross-off
cross
on
cross
cross-off
on
cross-off
cross-on
cross-on
cross
cross
cross
cross-off
High Tide
7:41PM1.46m
7:48AM1.28m
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
Low Tide
1:15PM0.41m
1:55AM0.55m
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
cloud
part cloud
clear
clear
clear
part cloud
part cloud
clear
clear
clear
rain showers
rain showers
rain showers
rain showers
thunderstorm
rain showers
part cloud
rain showers
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:52
4:52
4:54
4:54
4:54
4:56
4:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:45
6:44
6:43
6:42
6:40
6:39
6:38
 mm
3
6
2
3
5
1
1
Temp °C
25
25
24
28
28
24
26
28
26
30
29
26
28
29
28
28
28
26
29
30
26
Feels °C
25
24
22
25
25
22
24
28
26
31
32
29
31
32
32
31
29
29
27
28
22
  • 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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