Surf Forecasts:
Hanamizu River surf forecast from 11 Sep 2026:
- Most powerful swell: Friday 18 Sep, 9PM (local time) - 3.5ft (1.1m), 15s period, SE swell with 551 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 1.1m 15s and forecast to arrive on Friday (Sep 18) at 9PM. 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 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9PM (Fri 18th Sep) | 3.5ft (1.1m) 15s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the menu for our local stretch.
To be straight with you, the first week is a write-off. From Friday the 11th to the middle of the month, we’ve got next to nothing – tiny, weak swells and mostly dodgy winds. You’ll be staring at a flat lake, so save your energy. The combined energy is barely registering, and the water’s sitting at a warm 81°, which is about average for this time of year.
Things finally start to show a pulse around Friday the 18th of September. The swell begins to fill in, and by Saturday the 19th we see some proper energy. The Hanamizu River sandbar picks up a 4ft SE groundswell with a period of 14 seconds. The wind is a clean cross-off from the NNE, so conditions should be tidy. This is a beginner-friendly spot, so it’s not going to be gnarly, but for a fun, easy session, this Saturday morning is the first real chance you’ll get.
Now, if you’re an experienced surfer, hold out for the end of the month. Friday the 25th of September is the standout. We’ve got a solid 8ft SSE groundswell with a very long 16-second period. The combined energy is pumping hard, and with a clean cross-off breeze from the NNE, it’s going to be firing. This is expert territory though – too big for beginners. The long period means the sets will have some serious push, and at a river mouth, it could get a bit tricky. If you’ve got the skills, that’s your morning.
The following day, Saturday the 26th, the models are hinting at something truly massive, but frankly, it’s too big. We’re talking a 44ft swell from the south with a 17-second period – that’s a beast. The energy reading is off the charts, but that’s for the big dogs only, and even then, it’s probably going to be a close-out. The afternoon drops to 18ft, but the onshore wind will chop it up. Best to watch that one from the cliff.
All in all, we’ve got a long flat spell to start, then a nice building trend. The 25th is your best bet for a proper barrel chase. Keep an eye on it, because long-range forecasts can shift, but it looks promising.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Fri night. Warm (max 28°C on Mon morning, min 19°C on Fri afternoon). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 15mm), heaviest on Wed morning. Warm (max 29°C on Mon afternoon, min 22°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 7 | SE 8 | S 4 | SE 9 | SSE 8 | SE 8 | SSE 7 | SE 7 | SE 8 | SE 8 | SE 7 | SSE 9 | SE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 28 | 19 | 18 | 18 | 9 | 5 | 12 | 14 | 18 | 24 | 29 | 28 | 17 | 20 | 11 | 17 | 17 | 8 | 8 | 18 |
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 | glassy | cross-on | cross-off | cross-on | cross-on | cross-off | cross-on | cross-on | glassy | glassy | glassy | 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 | 10:57PM0.49m | 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 | |||||||
 |  | |  |  |  | |  |  | |  | | |  | | | | |  | | |
 | — | — | 5:22 | — | — | 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 | 3 | 6 | 3 | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 5 | — | 5 | 8 | — |
Temp °C | 19 | 20 | 21 | 22 | 22 | 24 | 24 | 24 | 28 | 29 | 25 | 28 | 28 | 25 | 24 | 24 | 23 | 22 | 21 | 22 |
Feels °C | 20 | 21 | 22 | 23 | 23 | 27 | 26 | 27 | 29 | 30 | 28 | 29 | 29 | 29 | 28 | 28 | 24 | 24 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | S 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SE 9 | SE 7 | SE 8 | SE 10 | SE 9 | SSE 8 | SE 8 | SSE 7 | SE 7 | SE 8 | SE 8 | SSE 8 | SSE 9 | SE 8 |
| kJ | 28 | 19 | 18 | 18 | 9 | 5 | 12 | 14 | 18 | 15 | 29 | 28 | 17 | 20 | 11 | 17 | 17 | 6 | 8 | 18 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SE 9 | SE 7 | SSW 7 | SW 7 | S 7 | E 12 | E 14 | S 7 | E 14 | — | SE 9 | E 13 | E 12 | SE 7 | ESE 8 | SE 18 |
| kJ | 4 | 4 | 4 | 4 | 3 | 2 | 5 | 2 | 1 | 11 | 15 | 1 | 4 | — | 3 | 13 | 3 | 8 | 6 | 13 |
Swell 3 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | E 14 | E 13 | SE 9 | E 13 | E 12 | E 12 | E 15 | SW 7 | S 7 | E 14 | S 7 | SE 9 | S 8 | S 7 | E 12 | E 11 | SSE 8 |
| kJ | 1 | 1 | 1 | 4 | 4 | 3 | 3 | 3 | 3 | 4 | 2 | 1 | 16 | 1 | 3 | 1 | 1 | 3 | 2 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | NNE 2 | NNE 2 | NNE 2 | — | — | — | — | S 4 | SSW 4 | — | S 3 | — | — | — | — | — | — | — |
| kJ | — | — | 1 | 1 | 1 | — | — | — | — | 24 | 8 | — | 3 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 69 | 69 | 69 | 69 | 12 | 12 | 59 | 76 | 77 | 77 | 12 | 76 | 77 | 41 | 41 | 41 | 69 | 76 | 101 | 123 |
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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