Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 8 am 02 Sep 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.6°C
0.9° 

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 2 Sep 2026:

  • Best quality surf: Friday 4 Sep, 12AM (local time) - 2ft (0.6m), 11s period, S swell with cross-offshore winds.
  • Most powerful swell: Wednesday 9 Sep, 3PM (local time) - 8ft (2.4m), 13s period, S swell with 1,952 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 12AM (local time) - 2ft (0.6m), 11s 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 (Sep 04) at 12AM. The primary swell is predicted to be 0.6m and 11s period with a secondary swell of 0.1m 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 2.4m 13s and forecast to arrive on Wednesday (Sep 09) 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 0.8m 4s period and expected on Sunday (Sep 06) at 6AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Fri 4th Sep)2ft (0.6m) 11s
Best Surf12AM (Fri 4th Sep)2ft (0.6m) 11s
Most Powerful 3PM (Wed 9th Sep)8ft (2.4m) 13s

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


The Lowdown

Alright, let’s break it down for Hanamizu River. The next 16 days are a real rollercoaster, with a lot of flat, weak stuff early on, and a couple of big pulses later. Water temp is about 82°F, which is normal for the season.

The first week, from Wednesday, September 2nd right through the 8th, is a total dud. Swell is tiny, mostly under 2 feet, coming from the SSW or S, with short periods. The combined energy is low, typically under 100 (19-94). Winds are cross or cross-off, but there’s just no wave to ride. A real slow start.

Then on Wednesday, September 9th, the swell jumps to 6 feet from the S, with a 12-second period. The energy is 798 (moderate). The wind is a fresh cross-onshore, so it’s lumpy. The afternoon sees 8 feet from the S, with a 13-second period, and energy hits 1952 (strong). The wind is still cross-onshore, so it’s choppy and messy. Not a clean wave.

Thursday, September 10th, still has a solid 8 to 8 feet S/SSE swell, with energy over 1000-2151. Wind is cross or cross-onshore, and the surf quality is poor. Too much wind.

The real standout—and the only clear winner—comes on Wednesday, September 16th. The morning shows a solid 10 feet from the S, with a very long period of 14 seconds. The combined energy is a massive 4020 (very strong). This is a proper groundswell. The wind is light and cross-shore, so it should be clean. Because it’s a river mouth, that long period can make the wave a bit straight, but with that size and light wind, it’s the best bet. The afternoon has the same size but the wind turns cross-onshore, so the morning is the window.

September 17th still has a 5 to 5 feet S/SSE swell with moderate energy (875) and light cross-shore wind, making for surfable but not great conditions.

So, the first week is a blank. The best window is the morning of September 16th. That’s a big-wave day, not for beginners. Crowds are possible at this spot.

Rusty.

Short Range Forecast

Heavy rain (total 126mm), heaviest during Fri morning. Warm (max 28°C on Thu morning, min 19°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 91mm), heaviest during Sun night. Warm (max 25°C on Sat afternoon, min 19°C on Sat morning). Mainly fresh winds.

Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
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
1
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
8
0.4
SSW
8
0.5
S
9
0.5
S
9
0.4
SSW
9
0.6
S
11
0.6
S
10
0.5
S
10
0.5
S
9
0.4
SSW
9
0.4
SSW
9
0.3
SSW
8
0.3
SSW
8
0.2
SSW
9
0.4
SE
7
0.4
SSE
7
0.4
SSE
7
0.4
SSE
7
0.7
S
8
1
S
11
1.3
S
12
Wave Graph
Metric surfscale
Energy kJ
14
24
37
39
25
93
71
48
42
26
25
13
14
7
12
18
20
21
64
220
485
Wind (km/h)
10
SSE
15
S
5
SW
10
SSW
15
SW
5
N
10
NE
15
NE
25
NNE
25
NNE
25
NE
25
N
30
N
30
N
30
N
25
N
25
NNE
20
NNE
25
NNE
20
NNE
25
SE
Wind State
cross-on
cross-on
cross-off
cross
cross
cross-off
cross
cross
cross-off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
on
High Tide
7:09PM1.49m
8:44AM1.20m
7:34PM1.45m
10:22AM1.10m
8:03PM1.40m
8:45PM1.32m
3:36PM1.25m
10:48PM1.25m
3:45PM1.33m
1:09AM1.28m
4:04PM1.39m
2:28AM1.38m
Low Tide
1:10PM0.72m
2:06AM0.32m
1:35PM0.87m
3:03AM0.35m
1:53PM1.01m
4:23AM0.38m
6:11AM0.37m
7:15PM1.21m
7:42AM0.29m
8:41PM1.09m
8:43AM0.22m
9:20PM0.95m
part cloud
part cloud
part cloud
cloud
cloud
heavy rain
heavy rain
heavy rain
heavy rain
rain showers
part cloud
rain showers
light rain
heavy rain
heavy rain
rain showers
cloud
part cloud
light rain
heavy rain
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:15
5:16
5:16
5:16
5:18
5:18
5:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:08
6:07
6:07
6:05
6:04
6:01
6:00
 mm
18
32
18
58
2
3
5
16
64
1
2
15
74
Temp °C
27
27
26
28
27
26
22
22
21
23
25
22
21
21
21
24
24
22
24
23
27
Feels °C
29
29
29
31
29
29
25
23
20
22
23
20
18
19
19
23
23
22
23
23
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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