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
Alright, let's have a look at what's brewing for the next couple of weeks at Hanamizu River.
Honestly, right now it's dead flat, and we're looking at a good 5-day stretch with barely a bump. The first real chance for a wave comes on September 19th. The water temp is around 81°, which is about 2° warmer than average for this time of year – nothing crazy, just a bit of that tropical bathwater feel.
So, the one standout window in this whole forecast is Saturday the 19th and Sunday the 20th. We finally get some proper life with a 6ft to 7ft swell from the SSE, riding on a very long 14-15 second period. That's real groundswell, and the raw energy backs it up – the combined energy reading shoots from 1359 up to 2012. That's a powerful push. The wind is blowing steady out of the N to NNE at around 12 mph, which is pure cross-offshore. That means the faces will be clean and lined up. Now, this is a beach and sandbar deal, and with that super long period, the waves might break a little fast and close out on the wrong banks. But if you find a good bend in the river mouth, it's going to be a lot of fun. The swell size is over 5ft, so this is not for beginners. For anyone who can handle a bigger wave on a sandbar, it's game on. The crowds can be "sometimes" an issue here, so expect a handful of others with the same idea.
Into Monday the 21st, it gets even bigger, with swell cranking up to 8ft to 10ft from the S, and the energy reading hitting a massive 3747. That's a lot of water moving. At that size, it's expert-only territory, especially with that long period and the shifting river mouth. The wind stays clean out of the NNE in the morning but swings cross-shore from the NE in the afternoon, so get out there early. After that, it drops off hard. By Tuesday the 22nd, the swell fades to under 3ft, and we're back to small, ordinary leftovers for the rest of the forecast.
So, the bottom line: it's a long wait, but the weekend of September 19th and 20th is your window. Hanamizu River will be pumping with clean, long-period groundswell. It might not be perfect for a beach break, but for a couple of days, it's the best show in town.
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  | ||||||||||||||||||||
 kJ | 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 |
| kJ | 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 |
| kJ | 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 | — | — | — | — | — | — | — | — |
| kJ | 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 |
| kJ | 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 | ||||||||||||||||||||
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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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