Hanamizu River Surf Break

Lat Long: 35.29° N 139.26° E

Hanamizu River Surf Forecast and Surf Report

Issued: 8 am 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Hanamizu River sea temperature is
27.9°C
1.1° 

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 1 Sep 2026:

  • Best quality surf: Tuesday 8 Sep, 3PM (local time) - 10ft (3.0m), 11s period, SSE swell with glassy winds.
  • Most powerful swell: Tuesday 8 Sep, 3PM (local time) - 10ft (3.0m), 11s period, SSE swell with 2,139 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 12AM (local time) - 1.5ft (0.5m), 12s 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 0.5m and 12s period with a secondary swell of 0.4m and 6s. Another secondary swell of 0.3m and 2s 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 11s and forecast to arrive on Tuesday (Sep 08) at 3PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Monday (Sep 07) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Fri 4th Sep)1.5ft (0.5m) 12s
Best Surf 3PM (Tue 8th Sep)10ft (3.0m) 11s
Most Powerful 3PM (Tue 8th Sep)10ft (3.0m) 11s

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


The Lowdown

Alright, Rusty here, let's take a look at what we've got cookin' for the next couple of weeks.

Alright folks, let's be straight with each other. The first week of September is pretty much a total write-off for Hanamizu River. We're looking at a whole lot of nothing for the first six days. Tiny, weak swell with poor surf conditions, cross-onshore breezes... it’s gonna be flat and frustrating. You'll see some tiny 1 ft to 2 ft dribblers, but with combined energy barely hitting triple digits (the biggest is a 108 on the 4th), it's not worth paddling out for. It's the kind of stretch where you're better off getting the wax off your board and waiting it out.

Alright, now here’s where it gets interesting. We've got some big energy rolling in, but you gotta be careful what you wish for.

Tuesday, September 8th – The afternoon is the first real spark. A solid 10 ft swell starts pumping in from the SSE with a period of 11 seconds, and the combined energy is a massive 3240 – that’s some serious juice. The wind goes glassy. This is genuinely excellent surf for experienced surfers, but let's be clear: at 10 ft, this is not a beginner's playground. This is for the boys who know what they're doing.

Wednesday, September 9th – This is the big one, but with a huge caveat. The morning and afternoon see an 12 ft swell from the S and SSE, pushing the combined energy to 2968 and then a whopping 4888. The wind is cross-off and clean, which sounds perfect. But the forecast is screaming that this swell is predicted to be *too big* for this break. The waves will be wrapping in with power, but it could be a washing machine at Hanamizu River. If you’re an expert and you know this river mouth, you might score a session, but for most of us, this is a day to watch from the bank. It’s just too much water moving.

After that, it gets messy again. Thursday and Friday the 10th and 11th have surf, but the wind switches onshore, making it lumpy and choppy. The energy is still strong – over 1000 – but the quality is gone. Then we drop back into the doldrums over the weekend of the 13th and 14th, with weak, crappy waves. There’s a late pulse on Tuesday, September 15th, with a 7 ft SE swell and 14-second period (1613 energy), but the onshore wind will likely ruin it again.

So, the real standout window is that Tuesday afternoon glass-off on the 8th, and the morning of the 9th for the true daredevils. Everything else is a gamble with iffy conditions.

Talking about water temps, for the first surf on the 1st, the water is sitting at 82°, which is a touch warmer than normal for this time of year. It’s nice, doesn't make a huge difference in a shorty, but it's good to know.

Hang in there.

- Rusty

Short Range Forecast

Moderate rain (total 14mm), heaviest on Thu night. Warm (max 28°C on Wed afternoon, min 22°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 87mm), heaviest during Sun night. Warm (max 25°C on Sat afternoon, min 20°C on Fri night). Mainly fresh winds.

Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
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
0
0
1
0
0
0
0
0
0
0
0
0
0
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)
0.2
E
12
0.3
SSW
9
0.3
SSW
8
0.3
SSW
8
0.4
SSW
8
0.4
SSW
9
0.4
SSW
9
0.5
S
9
0.5
S
12
0.6
S
10
0.6
SSW
9
0.8
SSW
9
0.6
S
8
0.6
S
8
0.4
SSW
8
0.4
SE
8
0.4
SE
7
0.5
SE
7
0.6
SE
8
0.6
SE
8
1.3
SSE
10
Wave Graph
Metric surfscale
Energy kJ
14
15
14
14
24
25
25
36
67
70
69
103
51
48
21
17
14
25
39
37
326
Wind (km/h)
10
E
5
SSE
0
NNW
5
SE
15
S
5
WSW
10
SW
5
SW
5
NE
20
NNE
25
N
20
NNE
20
NNE
30
NE
25
NNE
30
N
30
N
30
N
25
NNW
5
N
5
WSW
Wind State
cross-on
cross-on
glassy
glassy
cross-on
cross-off
cross
cross
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross-off
High Tide
6:47PM1.51m
7:44AM1.31m
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
Low Tide
12:44PM0.57m
1:22AM0.32m
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
clear
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heavy rain
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light rain
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<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:13
5:15
5:16
5:16
5:16
5:18
5:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:10
6:08
6:07
6:07
6:05
6:04
6:01
 mm
6
1
7
13
17
28
1
3
25
2
5
Temp °C
25
26
26
27
28
26
26
27
23
21
21
21
23
25
23
23
21
22
24
26
25
Feels °C
27
28
29
29
30
29
29
31
25
21
20
21
20
22
21
19
18
19
25
30
28
  • 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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