
Surf Forecasts:
Hanamizu River surf forecast from 14 Sep 2026:
- Best quality surf: Sunday 20 Sep, 6PM (local time) - 6ft (1.8m), 13s period, SSE swell with cross-offshore winds.
- Most powerful swell: Monday 21 Sep, 12PM (local time) - 6ft (1.9m), 14s period, S swell with 1,431 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 9PM (local time) - 1.5ft (0.4m), 10s 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 Monday (Sep 14) at 9PM. The primary swell is predicted to be 0.9m and 4s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.2m and 12s is also forecast. 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 1.9m 14s and forecast to arrive on Monday (Sep 21) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Sep 18) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 14th Sep) | 1.5ft (0.4m) 10s |
| Best Surf | 6PM (Sun 20th Sep) | 6ft (1.8m) 13s |
| Most Powerful | 12PM (Mon 21st Sep) | 6ft (1.9m) 14s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Hey folks, it’s Rusty here. Look, I’ll be straight with you—for the next little while, Hanamizu River is not giving us much. The forecast shows a long quiet stretch, with barely any rideable waves for the first five days or so. Water temp is sitting at about 80°, which is a solid 2° warmer than usual for this time of year, so it’s feeling pretty average for September.
Monday the 14th kicks off with a weak 3-ft S swell at a short 4-second period, and a messy cross-shore wind. Combined swell energy is a measly 58—barely a pulse. Tuesday and Wednesday stay poor, with tiny stuff under 2 ft and short periods. Thursday and Friday morning are still flat, but Friday afternoon on the 18th we finally see a jump: a 3-ft SSE swell with a very long 16-second period, and the energy reading hits 321 (moderate). Problem is, it’s still tagged as poor surf conditions, so don’t get too excited. That long-period groundswell might offer a few lined-up waves if you’re patient, but it’s a beach/sandbar setup here, so those long-interval swells can get a bit straight and tricky.
Now, the real standout comes a week later. Saturday the 19th morning brings 5-ft from the SSE at 14 seconds, winds offshore from the north at 16 mph—clean conditions. Combined swell energy jumps to 722 (moderate-to-strong). Saturday afternoon holds at 4-ft, same direction, energy at 801. Sunday the 20th picks up: 6-ft SSE in the morning, 5-ft in the afternoon, both with that long 13-second period and clean offshore breezes. Energy reads over 1000—strong wave energy. This is the best on offer. The swell direction from the SSE matches up nicely with the optimum SE direction for Hanamizu, and those cross-offshore winds will have the faces smooth. It’s a beginner-friendly break, but anything over 5-ft starts pushing it for the less experienced—so this is more for the intermediate crew who can handle a bit of juice. Crowds are sometimes an issue here, so expect company if it’s looking good.
Monday the 21st keeps the run going: 6-ft to 6-ft S swell, 14-second period, energy around 1400 to 1550, still clean with north-northeast winds. But Tuesday the 22nd goes over the top. Morning shows 8-ft from the SSW, and Tuesday afternoon the swell absolutely detonates—18-ft from the south at 16 seconds, with a combined energy reading of 13581. That is massive, way too big for this break, especially for a beginner spot. Only the experts with big-wave gear should even look at it, and even then, it’s likely a paddle-out mission into washing-machine chaos. After that, Wednesday the 23rd drops back to 5-ft and 4-ft, but the wind goes onshore or cross-onshore, so quality falls off.
From Thursday the 24th onward, we’re back to small, weak, or messy. A few brief moments on Friday the 25th afternoon show a glassy 3-ft SSE swell with a 10-second period and energy at 138—surfable but ordinary. After that, it’s tiny and choppy through to the end of the outlook on the 29th.
So, to sum it up: the best window is Saturday the 19th through Monday the 21st, with Sunday the 20th afternoon being the pick for cleaner, solid chest-to-head-high waves. If you’re chasing that, get on it. The rest of the 16 days is mostly a write-off.
Stay salty,
Rusty
Short Range ForecastHeavy rain (total 65mm), heaviest during Wed night. Warm (max 29°C on Mon afternoon, min 20°C on Wed afternoon). Winds increasing (calm on Tue afternoon, fresh winds from the NNE by Thu morning). | Days 5-7 Weather SummaryHeavy rain (total 52mm), heaviest during Sat night. Warm (max 23°C on Fri afternoon, min 18°C on Thu night). Mainly fresh winds. | |||||||||||||||||||
Mon 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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 4 | E 14 | SE 8 | SE 7 | SE 7 | SSE 7 | SE 8 | SE 8 | SSE 8 | NE 3 | SE 8 | SE 16 | SE 16 | SE 14 | SE 14 | SE 13 | SSE 12 | SSE 13 | SSE 13 | S 13 |
Wave Graph | ||||||||||||||||||||
28 | 34 | 24 | 16 | 23 | 9 | 17 | 17 | 7 | 7 | 9 | 10 | 306 | 676 | 722 | 535 | 680 | 1042 | 745 | 865 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:01PM1.51m | 6:59AM1.37m | 6:20PM1.49m | 7:40AM1.27m | 6:38PM1.46m | 8:27AM1.16m | 6:58PM1.41m | 9:36AM1.06m | 7:17PM1.35m | 7:36PM1.27m | 7:04PM1.18m | |||||||||
Low Tide | 00:34AM0.27m | 12:29PM0.71m | 1:07AM0.28m | 12:48PM0.82m | 1:43AM0.34m | 1:01PM0.91m | 2:27AM0.42m | 1:01PM0.99m | 3:27AM0.51m | 5:10AM0.56m | ||||||||||
— | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | |
5:52 | — | — | 5:51 | — | — | 5:50 | — | — | 5:47 | — | — | 5:46 | — | — | 5:45 | — | — | 5:44 | — | |
mm | — | 2 | 3 | 5 | 9 | 3 | 14 | 29 | — | — | — | — | — | — | 3 | 22 | 27 | — | 1 | — |
Temp °C | 29 | 26 | 24 | 24 | 24 | 21 | 21 | 20 | 21 | 20 | 19 | 22 | 23 | 21 | 22 | 21 | 22 | 23 | 23 | 22 |
Feels °C | 30 | 28 | 26 | 27 | 28 | 21 | 21 | 18 | 18 | 17 | 16 | 18 | 19 | 18 | 20 | 21 | 22 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 9 | SE 8 | SE 7 | SE 7 | SSW 6 | SE 8 | SE 8 | SSE 8 | SSE 8 | SE 9 | SE 8 | SE 16 | SE 14 | SE 14 | SE 13 | SSE 12 | SSE 13 | SSE 13 | S 13 |
15 | 22 | 24 | 14 | 23 | 7 | 17 | 17 | 7 | 7 | 3 | 3 | 306 | 676 | 722 | 535 | 680 | 1042 | 745 | 865 | |
Swell 2 Height (m) Direction Period (s) | E 12 | E 14 | S 7 | E 14 | SSW 6 | SSE 7 | SSW 6 | S 5 | SE 7 | — | SE 8 | SE 16 | ESE 9 | E 8 | — | SSE 15 | S 9 | — | S 15 | SE 10 |
11 | 33 | 1 | 4 | 11 | 9 | 3 | 2 | 2 | — | 9 | 10 | 15 | 12 | — | 266 | 2 | — | 275 | 207 | |
Swell 3 Height (m) Direction Period (s) | E 15 | E 14 | S 7 | E 14 | E 13 | SE 7 | SSW 6 | E 12 | S 5 | E 7 | SE 9 | S 13 | — | — | — | — | — | — | — | — |
4 | 34 | 1 | 16 | 13 | 9 | 6 | 3 | 1 | 1 | 3 | 3 | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | S 4 | SSW 4 | SSW 4 | S 4 | — | NE 3 | NE 3 | NNE 3 | NNE 3 | NE 3 | NE 4 | NNE 4 | NNE 4 | N 4 | NNE 4 | N 3 | NNE 3 | — | NNE 3 | NNE 3 |
28 | 27 | 5 | 15 | — | 2 | 1 | 8 | 6 | 7 | 14 | 16 | 16 | 13 | 11 | 6 | 3 | — | 8 | 3 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 119 | 76 | 12 | 77 | 12 | 59 | 69 | 203 | 123 | 527 | 444 | 203 | 123 | 203 | 123 | 98 | 12 | 3 | 0 | 12 |
Best forecast wave conditions in Kanagawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










