
Surf Forecasts:
Hanamizu River surf forecast from 9 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 3AM (local time) - 4ft (1.2m), 9s period, S swell with 220 kJ wave energy.
Best Forecast Surf Conditions for Hanamizu River this week:
The most powerful waves expected at Hanamizu River in the next 16 days are 1.2m 9s and forecast to arrive on Thursday (Sep 10) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Thursday (Sep 10) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3AM (Thu 10th Sep) | 4ft (1.2m) 9s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's get into it. The next stretch is a story of two halves, so pay attention.
Right now, we’re looking at a pretty flat spell. There’s a real drought of surfable waves for the next week and a bit, starting with nothing worth paddling out for from Thursday the 10th all the way through to Saturday the 19th. It’s a long, quiet stretch for Hanamizu River, so maybe get the boards waxed and the wetsuits sorted. We’ll see a few tiny pulses, nothing over 3 feet, and mostly from the south with short, weak 6-8 second periods. The energy is just pathetic, reading 14 to 147 in the combined swell energy, which tells you it’s mostly a lake out there. A couple of those mornings, like the 15th and 16th, will be glassy, but with nothing to ride, a glassy ocean is a tease. It’s not until the afternoon of Saturday the 19th that we get the first little blip, a 1.6ft wave from the SE that finally shows up as surfable, but just barely.
Now, for the good stuff. The second week is where the ocean finally wakes up. Sunday the 20th is when things start to get interesting. We’ve got a building S/SSE groundswell, and by Monday afternoon the 21st, it’s looking like the standout session of the whole forecast. The swell is up to 8.2ft from the S with a long 17-second period, and the combined energy is a strong 4717. The wind goes glassy, making it clean despite the cross-shore influence. This is the one to circle on the calendar if you've got the experience. It's a proper groundswell, hitting that 8.2ft mark which is getting into expert territory.
Tuesday the 22nd is where it goes over the top. The swell just keeps piling in. Tuesday morning we’re looking at 13.1ft from the south with an 18-second period and a massive 10058 in the energy reading. The wind is light, but this is way too big for Hanamizu River. It’s a beast. By Wednesday the 23rd, it’s a full-on ocean storm with 24.6ft surf and a near gale cross-onshore wind. That’s not surfing, that’s survival, and honestly, the setup looks way more interesting for kite surfing than paddle surfing. It will be blown out and messy.
The swell backs down through Wednesday afternoon, and by Thursday the 24th, there are still some waves in the 4.9-6.9ft range, but the quality drops and the wind turns messy onshore. The forecast ends with the ocean going quiet again on Friday the 25th. The long-range stuff looks promising, but remember, it’s a week out, so don’t hold me to it just yet. But for the one day that looks truly special, get on that Monday afternoon session.
Stay salty.
Short Range ForecastHeavy rain (total 56mm), heaviest during Thu night. Warm (max 22°C on Wed night, min 19°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 21mm), heaviest during Mon night. Warm (max 28°C on Mon morning, min 22°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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 9 | S 8 | S 8 | S 8 | S 8 | S 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSE 8 | SE 9 | SE 8 | SE 9 | SE 9 | SE 8 | SE 7 | SSE 7 | SSE 7 |
Wave Graph | |||||||||||||||||||
306 | 143 | 66 | 45 | 28 | 28 | 19 | 19 | 11 | 5 | 6 | 19 | 25 | 30 | 30 | 35 | 25 | 35 | 19 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | glassy | cross-on | cross-on | cross-off | glassy | glassy | cross-off |
High Tide | 3:26AM1.47m | 4:45PM1.46m | 4:15AM1.53m | 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 | |||||||
Low Tide | 9:53PM0.79m | 10:09AM0.18m | 10:26PM0.63m | 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 | ||||||
— | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | |
6:00 | — | 5:58 | — | — | 5:57 | — | — | 5:54 | — | — | 5:53 | — | — | 5:52 | — | — | 5:51 | — | |
mm | 17 | 1 | 8 | 13 | 8 | 7 | 2 | — | — | — | — | — | — | — | — | 21 | — | — | — |
Temp °C | 22 | 20 | 21 | 20 | 19 | 20 | 21 | 21 | 22 | 22 | 25 | 26 | 25 | 28 | 27 | 23 | 27 | 27 | 25 |
Feels °C | 21 | 18 | 20 | 20 | 20 | 20 | 22 | 21 | 23 | 23 | 28 | 29 | 29 | 29 | 29 | 24 | 30 | 31 | 28 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SSE 8 | SE 9 | SE 8 | SE 9 | SE 9 | SE 8 | SE 7 | SSE 7 | SSE 7 |
306 | 143 | 66 | 45 | 28 | 28 | 19 | 19 | 11 | 5 | 6 | 19 | 25 | 30 | 30 | 35 | 25 | 35 | 19 | |
Swell 2 Height (m) Direction Period (s) | ESE 9 | — | ESE 9 | SE 9 | S 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SSW 7 | SSW 7 | S 7 | S 7 | E 12 | S 7 | S 7 | S 7 | — |
9 | — | 8 | 3 | 1 | 4 | 4 | 4 | 4 | 3 | 5 | 5 | 1 | 1 | 12 | 1 | 1 | 1 | — | |
Swell 3 Height (m) Direction Period (s) | SE 11 | E 15 | E 15 | E 16 | SE 10 | S 8 | S 8 | E 14 | E 14 | E 13 | SE 9 | E 13 | — | SW 7 | E 15 | SW 7 | S 7 | E 12 | S 7 |
5 | 4 | 17 | 5 | 4 | 1 | 1 | 4 | 4 | 4 | 3 | 3 | — | 2 | 4 | 2 | 1 | 3 | 1 | |
Wind waves Height (m) Direction Period (s) | NE 3 | NNE 3 | NNE 3 | NE 3 | — | — | NNE 2 | NNE 2 | NNE 2 | NNE 2 | — | — | — | — | S 4 | — | — | — | — |
9 | 8 | 3 | 2 | — | — | 1 | 1 | 1 | 1 | — | — | — | — | 12 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 123 | 19 | 12 | 12 | 69 | 69 | 69 | 69 | 69 | 69 | 41 | 43 | 12 | 76 | 76 | 12 | 12 | 12 | 12 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










