Surf Forecasts:
Hanamizu River surf forecast from 10 Sep 2026:
- Best quality surf: Friday 18 Sep, 9AM (local time) - 1.5ft (0.4m), 18s period, SE swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 9AM (local time) - 1.5ft (0.4m), 18s period, SE swell with 81 kJ wave energy.
- Next surfable swell (1★+): Friday 18 Sep, 9AM (local time) - 1.5ft (0.4m), 18s period with SE 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 18) at 9AM. The primary swell is predicted to be 0.4m and 18s period with a secondary swell of 0.4m and 8s. 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 0.4m 18s and forecast to arrive on Friday (Sep 18) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 2s period and expected on Saturday (Sep 12) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Fri 18th Sep) | 1.5ft (0.4m) 18s |
| Best Surf | 9AM (Fri 18th Sep) | 1.5ft (0.4m) 18s |
| Most Powerful | 9AM (Fri 18th Sep) | 1.5ft (0.4m) 18s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, Rusty here. Let's see what we've got on the menu.
Well, it's a slow start. Real slow. For the first week, from Friday the 11th through to Thursday the 17th of September, we're looking at a flat spell. The swell is tiny, with heights barely making it to a foot and a half on the best days. It's mostly onshore or cross-off shore winds, and the raw energy is feeble – we're talking numbers in the teens and twenties (23 to 51). The conditions are clean at times, like on Monday the 14th with glassy conditions, but with a weak 1.3ft swell from the SE, there's just nothing to ride. It's a write-off for anyone looking for a proper wave. You'd be wasting your time.
Then things finally start to wake up. Friday the 18th of September brings a serious change. The swell kicks in from the SE, building to a solid 5.2ft by the afternoon. The period jumps to 16 seconds, which is a beautiful, long-period groundswell. The wind is a steady cross-offshore from the NNE, and the combined swell energy jumps to a significant 1286. It's still classed as marginal, but the raw materials are there. This is a real window of opportunity that runs through Saturday the 19th and into Sunday the 20th.
The standout for this whole forecast is Hanamizu River on Sunday the 20th of September. We're looking at a solid 7.5ft swell from the SSE with a 14-second period, and the combined energy is pumping at 2070. The wind is light and cross-offshore, keeping the river mouth clean. This is excellent surf for experienced surfers – it's got the size, the power, and the juice. It’s big, so leave your foamie at home. The crowds are just 'sometimes' here, which is a bonus, but this kind of swell will bring everyone out.
It gets wild after that. Tuesday the 22nd of September sees a massive 16.4ft to 11.5ft swell from the SSW, with a raw energy number over 8000. That's a lot of water moving. The wind is cross-off, but the file flat out says the swell is just too big for this break. Even for experts, it would be a washing machine. Not recommended.
After that massive pulse, it slumps back to messy, wind-blown junk. Wednesday the 23rd is a write-off with strong cross-onshore winds and barely 2.6ft of weak swell. Thursday the 24th goes glassy again, but with nothing to push you in. The last few days of the month stay tiny and weak. That Sunday the 20th is the one to circle on the calendar.
Short Range ForecastHeavy rain (total 37mm), heaviest during Fri morning. Warm (max 25°C on Sun afternoon, min 19°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 15mm), heaviest on Tue morning. Warm (max 28°C on Mon afternoon, min 22°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | S 8 | S 8 | S 8 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 8 | SE 7 | SE 9 | SE 10 | SE 9 | SE 8 | SSE 6 | SSE 7 | SSE 7 | SSE 6 | SSE 8 | SE 8 | SSE 8 | SE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 28 | 28 | 29 | 18 | 11 | 9 | 13 | 18 | 12 | 19 | 23 | 28 | 24 | 18 | 20 | 17 | 13 | 26 | 15 | 6 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-off | cross-on | cross-on | cross-off | glassy | glassy | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 5:05PM1.49m | 4:59AM1.54m | 5:24PM1.50m | 5:40AM1.52m | 5:42PM1.51m | 6:20AM1.46m | 6:01PM1.51m | 6:59AM1.37m | 6:20PM1.49m | 7:40AM1.27m | 6:38PM1.46m | 8:27AM1.16m | 6:58PM1.41m | ||||||||
Low Tide | 10:43AM0.24m | 10:57PM0.49m | 11:14AM0.34m | 11:29PM0.37m | 11:42AM0.46m | 00:01AM0.29m | 12:07PM0.58m | 00:34AM0.27m | 12:29PM0.71m | 1:07AM0.28m | 12:48PM0.82m | 1:43AM0.34m | 1:01PM0.91m | 2:27AM0.42m | |||||||
 |  |  | | |  |  |  |  | | |  |  |  | | |  |  |  | | | |
 | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — |
 | — | 5:57 | — | — | 5:54 | — | — | 5:53 | — | — | 5:52 | — | — | 5:51 | — | — | 5:50 | — | — | 5:47 | — |
mm | 20 | 4 | 7 | 5 | 1 | — | — | — | — | — | — | — | 6 | 1 | — | 1 | 3 | 4 | — | — | — |
Temp °C | 19 | 20 | 20 | 21 | 21 | 22 | 24 | 25 | 24 | 27 | 28 | 25 | 25 | 24 | 24 | 25 | 24 | 22 | 23 | 24 | 23 |
Feels °C | 21 | 21 | 21 | 22 | 22 | 24 | 26 | 28 | 28 | 29 | 29 | 27 | 29 | 28 | 28 | 28 | 26 | 23 | 24 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 8 | SE 7 | SE 9 | SE 10 | SE 9 | S 5 | SSE 6 | SSE 7 | SSE 7 | SSE 6 | SSE 8 | SE 8 | SSE 8 | SE 7 |
| kJ | 28 | 28 | 29 | 18 | 11 | 9 | 13 | 18 | 12 | 19 | 23 | 28 | 11 | 18 | 20 | 17 | 13 | 26 | 15 | 6 | 7 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SSW 7 | SSW 7 | SW 7 | S 7 | — | E 14 | SE 8 | SE 8 | S 9 | SE 9 | SE 8 | E 12 | SSE 9 | ESE 7 | SE 9 |
| kJ | 4 | 4 | 4 | 4 | 4 | 3 | 5 | 5 | 2 | 1 | — | 14 | 24 | 10 | 2 | 3 | 11 | 3 | 7 | 5 | 3 |
Swell 3 Height (m) Direction Period (s) | S 9 | S 8 | S 8 | E 14 | E 14 | E 13 | E 13 | E 13 | E 12 | E 12 | E 15 | SW 7 | S 7 | E 14 | S 9 | E 11 | S 8 | S 8 | E 12 | E 11 | E 11 |
| kJ | 1 | 1 | 1 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 4 | 2 | 1 | 4 | 2 | 3 | 1 | 1 | 3 | 2 | 2 |
Wind waves Height (m) Direction Period (s) | — | — | — | NE 2 | NNE 2 | NNE 2 | — | — | — | — | S 4 | SSW 4 | — | — | — | — | — | ENE 2 | — | — | — |
| kJ | — | — | — | 1 | 1 | 1 | — | — | — | — | 12 | 10 | — | — | — | — | — | 1 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 41 | 80 | 69 | 69 | 76 | 12 | 69 | 41 | 12 | 12 | 62 | 77 | 77 | 12 | 12 | 41 | 62 | 62 | 62 | 69 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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