Surf Forecasts:
Hanamizu River surf forecast from 29 Aug 2026:
- Best quality surf: Friday 4 Sep, 3PM (local time) - 1.5ft (0.5m), 9s period, E swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 6PM (local time) - 2ft (0.6m), 8s period, S swell with 50 kJ wave energy.
- Next surfable swell (1★+): Friday 4 Sep, 3PM (local time) - 1.5ft (0.5m), 9s period with E 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 3PM. The primary swell is predicted to be 0.5m and 9s period with a secondary swell of 0.3m and 8s. Another secondary swell of 0.4m and 6s 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 0.6m 8s and forecast to arrive on Wednesday (Sep 02) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Sunday (Sep 06) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Fri 4th Sep) | 1.5ft (0.5m) 9s |
| Best Surf | 3PM (Fri 4th Sep) | 1.5ft (0.5m) 9s |
| Most Powerful | 6PM (Wed 2nd Sep) | 2ft (0.6m) 8s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, Rusty here, checkin’ the Hanamizu River for the next couple o’ weeks. Gotta be honest, the first part of this forecast is a tough one.
From Sunday, August 30th, right through to Thursday, September 10th, it’s a flat spell. We’re talkin’ tiny waves, mostly 1 to 2 feet, with a combined swell energy that’s hardly breakin’ 100 (between 18 and 77). The wind’s all over the place, mostly side or side-onshore, makin’ it choppy. It’s a long, slow period. The only bright spot is Friday afternoon, September 4th, when the wind goes glassy, but the swell is still only 2 feet with an energy of 77 – just ordinary.
Things start to stir on Monday, September 7th. The swell picks up to 2 feet from the South with a 10-second period, and the energy hits 95. The wind is clean, cross-offshore from the NNE, so it’ll be smooth. Still small, but a sign of life.
The real story, the one that’s got me stoked, is the second week. From Tuesday, September 8th, the swell model kicks in. We get a proper groundswell from the SE with a long 12-second period and energy jumpin’ to 245. It’s a bit choppy with side wind, but the power is there. This builds through Wednesday and Thursday, with the swell holdin’ around 3 to 3 feet and the energy climbin’ into the 300s. On Thursday, September 10th, the wind goes cross-offshore from the North, so the morning will be clean and have some punch.
The standout, the one you don’t wanna miss, is Sunday, September 13th. The morning looks perfect. Swell size hits 6 feet from the SSW, with a very long 15-second period, and the combined energy is a massive 1296. The wind is glassy – dead calm from the East. That’s a recipe for some truly good, clean waves. The water temp is about normal for the time of year. Just remember, with a long period swell like that, the river break can get a bit straight, but that glassy morning will make it all work. The afternoon might get messy with a side-onshore breeze and risk of storms, so get out there early.
Monday, September 14th morning is still lookin’ good, with a clean 4-foot SSW swell and a 12-second period, though the energy drops to 374.
So, to sum it up: the first ten days are a write-off. The real action is from the 8th, buildin’ to a clean, glassy, and powerful morning on the 13th of September. That’s your day.
- Rusty
Short Range ForecastMostly dry. Warm (max 28°C on Tue afternoon, min 21°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Warm (max 30°C on Thu afternoon, min 22°C on Fri morning). Wind will be generally light. | ||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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) | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSE 10 | SSW 9 | E 12 | SSW 9 | SSW 8 | SSW 8 | S 8 | SSW 8 | S 5 | SSW 4 | S 6 | SSW 9 | E 9 | SSW 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 12 | 18 | 18 | 11 | 11 | 9 | 15 | 14 | 15 | 14 | 14 | 35 | 24 | 18 | 25 | 36 | 26 | 39 | 7 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | on | glassy | cross-off | cross | cross-off | cross | cross-on | glassy | cross-on | cross-on | cross-off | cross-on | cross | cross | cross | glassy | cross |
High Tide | 5:33AM1.50m | 6:05PM1.51m | 6:13AM1.47m | 6:25PM1.51m | 6:56AM1.40m | 6:47PM1.51m | 7:44AM1.31m | 7:09PM1.49m | 8:44AM1.20m | 7:34PM1.45m | 10:22AM1.10m | 8:03PM1.40m | |||||||
Low Tide | 11:38PM0.52m | 11:50AM0.32m | 00:10AM0.43m | 12:17PM0.43m | 00:44AM0.36m | 12:44PM0.57m | 1:22AM0.32m | 1:10PM0.72m | 2:06AM0.32m | 1:35PM0.87m | 3:03AM0.35m | 1:53PM1.01m | |||||||
 |  | |  |  | | |  | |  | | | | |  |  | | |  | |
 | — | 5:13 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — |
 | 6:15 | — | 6:14 | — | — | 6:12 | — | — | 6:10 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 7 | — | — | 2 |
Temp °C | 22 | 24 | 25 | 25 | 25 | 26 | 25 | 27 | 28 | 27 | 28 | 28 | 27 | 29 | 30 | 25 | 23 | 24 | 24 |
Feels °C | 23 | 27 | 28 | 29 | 27 | 29 | 27 | 30 | 30 | 31 | 31 | 30 | 30 | 30 | 31 | 26 | 26 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 8 | SSW 9 | SSW 8 | SSW 9 | SSW 8 | SSW 8 | SE 10 | SSW 8 | SSW 8 | SE 7 | S 6 | SSW 9 | SSW 8 | SE 6 |
| kJ | 11 | 18 | 18 | 11 | 11 | 6 | 15 | 14 | 15 | 14 | 14 | 4 | 24 | 14 | 7 | 36 | 26 | 14 | 6 |
Swell 2 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 9 | SE 9 | ESE 12 | ESE 11 | SE 10 | SE 7 | SE 8 | SE 7 | SE 10 | SSW 9 | SE 7 | SE 6 | SSW 9 |
| kJ | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 3 | 14 | 12 | 4 | 2 | 10 | 7 | 4 | 15 | 11 | 10 | 7 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | E 11 | — | SW 6 | E 14 | E 13 | E 13 | E 12 | SE 10 | SE 10 | SE 8 | E 10 | SE 11 | SE 10 | SW 12 | SE 10 | SW 13 | SSW 12 | SW 11 |
| kJ | 12 | 2 | — | 1 | 4 | 3 | 3 | 11 | 4 | 4 | 3 | 2 | 5 | 4 | 5 | 4 | 6 | 14 | 5 |
Wind waves Height (m) Direction Period (s) | NNE 3 | NNE 2 | — | — | — | NNE 3 | NNE 2 | — | — | — | — | S 8 | SSW 3 | S 5 | SSW 4 | W 3 | NE 3 | E 9 | — |
| kJ | 1 | 1 | — | — | — | 1 | 1 | — | — | — | — | 35 | 6 | 18 | 25 | 1 | 2 | 39 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 87 | 76 | 41 | 76 | 87 | 41 | 12 | 41 | 41 | 12 | 12 | 103 | 12 | 77 | 77 | 112 | 59 | 0 | 59 |
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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