Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 2 am 01 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.4° C
0.8° 

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 31 Jul 2026:

  • Best quality surf: Thursday 6 Aug, 12AM (local time) - 10ft (3.0m), 16s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Wednesday 5 Aug, 3PM (local time) - 10ft (3.0m), 16s period, SSE swell with 4,320 kJ wave energy.
  • Next surfable swell (1★+): Saturday 1 Aug, 9PM (local time) - 2.5ft (0.7m), 6s 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 Saturday (Aug 01) at 9PM. The primary swell is predicted to be 0.7m and 6s period with a secondary swell of 0.4m and 6s. Another secondary swell of 0.2m and 16s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Hanamizu River in the next 16 days are 3.0m 16s and forecast to arrive on Wednesday (Aug 05) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Wednesday (Aug 05) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Sat 1st Aug)2.5ft (0.7m) 6s
Best Surf12AM (Thu 6th Aug)10ft (3.0m) 16s
Most Powerful 3PM (Wed 5th Aug)10ft (3.0m) 16s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it.

It’s a quiet start for Hanamizu River. The opening days of the outlook are bare, with no surf worth chasing until the 3rd of August. We’re talking a solid gap right at the beginning of the period. The water temperature is sitting at 81°F which is about average for this time of year, so nothing to write home about there.

The first real chance to get wet is Monday morning, the 3rd of August. We’re looking at a 3 ft swell from the SE, with a period of 16 seconds. That’s a long-period groundswell, which at a beach/sandbar setup like Hanamizu River can be a bit tricky – it might break too straight and make for a less playful wave. The wind is from the NNE at 25 km/h, cross-off, so the face will be clean. The energy is building, with a combined swell energy of 306 (moderate). It’s still a marginal call, but the clean conditions make it the best we’ve seen so far.

By Tuesday morning, the 4th of August, the swell jumps to 5 ft from the SE, period still 17 seconds. That’s getting into the territory where it might be too much for beginners. The wind is cross-off again, keeping it clean. The combined energy jumps to 1278 (strong). This is a notable step up, but still a bit of a gamble with the tide and the long period for a beach break. The afternoon gets bigger at 6 ft, but the wind swings cross-on and it gets choppy – not ideal.

The standout period for the whole run is the 5th of August. Wednesday morning delivers a 8 ft swell from the SSE, period 16 seconds, with a clean cross-off wind from the NNE at 20 km/h. The combined energy is a massive 3834 (very strong). This is big, powerful, and clean – only for experienced surfers. The wave face should be beautiful, but the size and the long period will make it a beast. This is the best on offer, no question. The afternoon bumps up to 10 ft, but the wind goes light cross-on, which might just put a wrinkle on it.

The 6th and 7th of August keep the size up, with 8 ft and 6 ft swells respectively, but the wind is mostly cross-on or onshore, messing with the quality. The energy is still strong, but the chop is a problem.

After that, the surf drops off fast. From the 8th of August onward, the swell fades below 4 ft, and the wind is a mixed bag of cross-on and cross-off, but the energy drops to weak levels. There’s a long stretch of poor conditions right through to the 15th of August – nothing to get excited about.

Then, on the 16th of August, Sunday morning, the swell makes a comeback to 6 ft from the SE, period 14 seconds, with a clean cross-off wind. The energy is back up to 1208 (strong). It’s a promising late-season pulse, but it’s far out – treat it as a hopeful look, not a sure thing.

So, for the whole 16-day window, the pick of the bunch is the 5th of August. That Wednesday morning at Hanamizu River with the 8 ft SSE swell and clean cross-off wind is the one to circle on the calendar. Just remember, it’s big, it’s powerful, and with that long period, it’s a challenge.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Sat afternoon. Warm (max 30°C on Sat morning, min 22°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 30°C on Wed afternoon, min 25°C on Tue morning). Wind will be generally light.

Saturday
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
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
1
1
2
1
1
3
3
3
4
3
2
4
3
1
2
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
0.4
SSW
6
0.3
SE
17
0.4
ESE
16
0.5
SE
15
0.6
ESE
15
0.8
SE
16
0.9
SE
17
1.1
SE
17
1.5
SE
17
1.8
SE
17
2.3
SE
16
2.5
SSE
16
3
SSE
16
3
SSE
16
2.5
S
16
2.5
S
15
2.2
S
14
1.9
SSW
14
2
SSW
14
1.7
SSW
14
Wave Graph
Metric surfscale
Energy kJ
9
14
46
99
104
148
302
487
763
1267
1848
2709
3834
4320
3760
3588
2831
1984
1533
1548
1158
Wind (km/h)
5
ESE
10
S
5
NE
10
ENE
10
S
20
NE
25
NNE
20
NNE
25
NNE
25
NNE
20
ENE
20
NNE
20
NNE
10
E
10
NNE
10
E
15
S
5
WSW
5
SE
20
S
10
SW
Wind State
glassy
cross-on
glassy
cross-on
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross-on
cross-off
cross-off
cross-on
cross-off
cross-on
cross-on
glassy
on
cross-on
cross
High Tide
6:56PM1.46m
6:18AM1.43m
7:18PM1.46m
7:00AM1.37m
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
Low Tide
12:19PM0.20m
00:38AM0.68m
12:47PM0.29m
1:15AM0.61m
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
clear
thunderstorm
thunderstorm
part cloud
part cloud
cloud
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:50
4:50
4:52
4:52
4:54
4:54
4:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:46
6:45
6:45
6:44
6:43
6:42
6:40
 mm
2
2
Temp °C
30
30
29
30
30
25
26
26
25
28
29
25
29
30
27
29
29
28
29
28
26
Feels °C
33
34
34
33
34
24
25
25
23
26
28
25
30
32
31
33
31
33
32
30
30
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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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