Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 2 pm 20 Aug 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
26.8° C
0.2° 

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 20 Aug 2026:

  • Best quality surf: Monday 24 Aug, 9PM (local time) - 7ft (2.1m), 16s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Thursday 27 Aug, 3AM (local time) - 11ft (3.5m), 12s period, S swell with 3,541 kJ wave energy.
  • Next surfable swell (1★+): Friday 21 Aug, 9PM (local time) - 2.5ft (0.8m), 9s 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 Friday (Aug 21) at 9PM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.1m and 10s. Another secondary swell of 0.1m and 9s 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 3.5m 12s and forecast to arrive on Thursday (Aug 27) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Fri 21st Aug)2.5ft (0.8m) 9s
Best Surf 9PM (Mon 24th Aug)7ft (2.1m) 16s
Most Powerful 3AM (Thu 27th Aug)11ft (3.5m) 12s

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


The Lowdown

Alright folks, Rusty here with a look at what’s on the table for Hanamizu River over the next couple of weeks.

First up, water temp is sitting at a pretty normal 80°F for this time of year, so warm enough for a spring suit or just boardshorts.

Truth is, we’ve got a long dry spell to kick things off. From now through the 23rd of August, it’s pretty much a write-off. The swell is tiny – we’re talking 0.7ft to 3ft of weak, short-period stuff, with combined energies barely cracking 100, and the wind is mostly rubbish. The only tiny glimmer is Saturday morning the 22nd, where it goes glassy, but with a measly 1ft on offer, it’s not worth paddling out for.

We finally see some life on the morning of Monday the 24th. The swell jumps to 4ft from the SSE with a very long 16-second period. The combined energy hits 1389, a solid kick of power. It’s surfable, but with onshore wind, it’s marginal.

The standout window is the morning of Friday the 28th. We’ve got a clean 7ft south swell with a 10-second period and a light offshore breeze from the WSW. The energy is strong at 1097, and the waves should be proper. This is the pick of the bunch for anyone who knows what they’re doing. The afternoon of the 28th looks even cleaner, going glassy with that same 7ft south swell, though the period drops a bit to 9 seconds. Still, glassy conditions on a decent-sized swell are a treat.

After that, it trails off, with a few clean mornings but much smaller waves dropping below 3ft. From the 31st onwards, you’re looking at clean, offshore winds but tiny 2ft to 2ft leftovers. Not enough grunt to get excited about unless you’re on a longboard.

So, to sum it up: the first week is a bust, but that Friday the 28th is your day. It’s a river mouth sandbar, so expect it to be peaky. Don't sleep on it.

- Rusty

Short Range Forecast

Moderate rain (total 15mm), heaviest on Sat night. Warm (max 28°C on Fri afternoon, min 24°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 12mm), heaviest on Wed morning. Warm (max 29°C on Tue afternoon, min 23°C on Wed morning). Wind will be generally light.

Thu
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
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
2
3
0
4
3
0
4
3
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)
0.2
SSW
9
0.2
S
10
0.4
SSW
9
0.8
S
9
0.4
SSW
9
0.4
SSW
9
0.4
SSW
9
0.4
SW
9
0.3
SSW
9
0.4
SE
16
0.9
SSE
15
1.3
SSE
16
1.4
SSE
15
2.1
SSE
15
2.2
S
15
2.3
S
16
2.4
S
14
2.1
S
13
1.9
S
12
3.5
S
12
Wave Graph
Metric surfscale
Energy kJ
8
8
27
101
35
32
32
20
15
61
372
859
869
1951
2293
2562
2391
1497
1065
3538
Wind (km/h)
15
S
10
SW
5
SSE
20
S
10
SW
5
SE
10
SSE
5
NW
15
NE
10
SSE
0
ESE
5
SE
20
S
10
WSW
10
SSE
25
S
10
WSW
10
SW
20
SSE
25
SSE
Wind State
cross-on
cross
cross-on
cross-on
cross
glassy
on
off
cross
cross-on
glassy
on
cross-on
cross-off
cross-on
cross-on
cross-off
cross
cross-on
on
High Tide
8:20PM1.36m
8:48PM1.29m
9:51PM1.23m
4:23PM1.21m
00:27AM1.21m
4:23PM1.27m
1:56AM1.27m
4:35PM1.33m
2:52AM1.35m
4:51PM1.38m
Low Tide
4:30AM0.52m
6:10AM0.53m
7:42AM0.47m
8:28PM1.14m
8:39AM0.38m
9:13PM1.05m
9:21AM0.30m
9:43PM0.96m
9:55AM0.23m
10:11PM0.85m
cloud
part cloud
rain showers
thunderstorm
rain showers
part cloud
thunderstorm
thunderstorm
rain showers
part cloud
clear
part cloud
clear
clear
clear
clear
rain showers
mod rain
heavy rain
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:05
5:07
5:07
5:07
5:09
5:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:27
6:24
6:23
6:22
6:21
6:20
6:19
 mm
1
2
2
1
8
1
2
10
44
67
Temp °C
27
26
27
28
26
28
28
27
26
26
26
27
28
26
28
29
27
25
23
26
Feels °C
29
29
30
30
29
31
31
31
29
29
31
29
31
29
31
30
30
28
24
26
  • 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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