Surf Forecasts:
Hanamizu River surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 3AM (local time) - 6ft (1.8m), 16s period, SSE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 3PM (local time) - 6ft (1.9m), 16s period, SSE swell with 1,780 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 9PM (local time) - 1.5ft (0.5m), 15s 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 Sunday (Aug 23) at 9PM. The primary swell is predicted to be 0.5m and 15s period with a secondary swell of 0.2m and 9s. Another secondary swell of 0.4m and 8s 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 16s and forecast to arrive on Tuesday (Aug 25) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 9s period and expected on Tuesday (Aug 25) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 23rd Aug) | 1.5ft (0.5m) 15s |
| Best Surf | 3AM (Tue 25th Aug) | 6ft (1.8m) 16s |
| Most Powerful | 3PM (Tue 25th Aug) | 6ft (1.9m) 16s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s on the menu for Hanamizu River.
Honestly, the first week and a half is a real write-off. From now, right through until the end of next week, we are looking at tiny, weak, onshore-garbled slop. The combined swell energy barely gets into double digits most days. You’re looking at waves around 0.7ft to 2ft, mostly cross-onshore breezes, and the wave comment pretty much sums it up: poor surf conditions. It’s a flat spell, and there’s nothing to get excited about.
The real story kicks off on Monday the 25th of August when we see a proper pulse pushing in. Tuesday morning the 26th is where you want to circle on the calendar. That morning, the wind goes completely glassy, dead calm, with a solid 7ft south-southwest swell rolling in, and the period is a very long 15 seconds. The combined energy is strong at 1960. This is proper groundswell, the kind that sets your soul on fire. It’s also in the expert range over 5ft, so this is not for beginners. That afternoon stays glassy with a 7ft, 16-second swell and energy climbing to 2338. It doesn't get much better than glassy conditions and a long-period south swell at a sandbar.
Thursday morning the 27th gets a cross-offshore breeze from the north-northeast, keeping it clean with even more size—8ft, 16-second swell—and the energy jumps to 2971. The swell direction is still south, which works well for this spot being a SE optimum. This is the standout. These two days, the 26th and 27th, are the absolute best on offer.
After that, things get wild and a bit messy. Friday the 28th has heavy rain and strong winds, though cross-offshore, with a 7ft swell, but the energy drops. Saturday the 29th gets a 10ft and then an 12ft south swell, but the afternoon turns into a messy cross-onshore. That size is only for the hardcore, and the quality drops off a cliff. Into the following week, the swells taper down again and the cross-offshores stick around for cleaner but smaller waves in the 4ft to 6ft range.
So, to sum it up: tough start, but the middle of the second week offers some absolute gems. The standout is the morning of August 26th at Hanamizu River—glassy, strong, long-period groundswell, and clean. The Thursday morning after that runs a close second. Don’t sleep on it if you’ve got the skill for the size.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Fri night. Warm (max 28°C on Sat morning, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
AM | 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) | SSW 8 | SSW 8 | SE 6 | SE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 9 | S 10 | S 9 | S 9 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSE 17 | SE 14 | SSE 16 | SSE 16 | SSE 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 12 | 10 | 6 | 7 | 4 | 4 | 8 | 8 | 41 | 40 | 52 | 49 | 32 | 32 | 20 | 28 | 92 | 458 | 798 | 1591 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | glassy | cross-on | cross-on | glassy | on | cross-on | cross | on | cross-on | cross-off | cross-on | cross-on | off | cross | cross-on | cross-off | cross-on | cross-on | cross |
High Tide | 7:37PM1.44m | 8:53AM1.12m | 7:57PM1.41m | 10:11AM1.02m | 8:20PM1.36m | 8:48PM1.29m | 9:51PM1.23m | 4:23PM1.21m | 00:27AM1.21m | 4:23PM1.27m | 1:56AM1.27m | ||||||||||
Low Tide | 1:29PM0.70m | 2:31AM0.45m | 1:44PM0.83m | 3:21AM0.48m | 1:46PM0.94m | 4:30AM0.52m | 6:10AM0.53m | 7:42AM0.47m | 8:28PM1.14m | 8:39AM0.38m | 9:13PM1.05m | ||||||||||
 | |  |  | | | | |  | | |  |  | | | | | | | | | |
 | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — |
 | — | 6:29 | — | — | 6:28 | — | — | 6:27 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | 2 | 3 | 2 | 1 | — | — | — | — |
Temp °C | 27 | 27 | 26 | 27 | 28 | 26 | 27 | 28 | 26 | 27 | 27 | 26 | 28 | 28 | 27 | 27 | 28 | 27 | 28 | 27 | 26 |
Feels °C | 29 | 29 | 30 | 30 | 29 | 30 | 29 | 30 | 30 | 30 | 29 | 30 | 32 | 31 | 32 | 32 | 32 | 31 | 32 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | SSE 6 | SSW 8 | SE 6 | SE 6 | SE 10 | SSE 6 | SSE 6 | SSE 6 | SSW 8 | S 9 | S 9 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSW 9 | SE 14 | SSE 16 | SSE 16 | SSE 16 |
| kJ | 3 | 6 | 10 | 6 | 4 | 3 | 3 | 3 | 6 | 41 | 40 | 52 | 49 | 32 | 32 | 20 | 15 | 92 | 458 | 798 | 1591 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SE 10 | SSW 8 | SE 10 | SW 8 | SE 10 | SE 10 | SSW 9 | S 10 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | SSE 5 | SSE 4 | ESE 13 | SSW 8 | SSW 8 | E 12 | — |
| kJ | 6 | 4 | 6 | 4 | 3 | 4 | 4 | 8 | 8 | 4 | 4 | 4 | 4 | 4 | 2 | 4 | 17 | 14 | 7 | 25 | — |
Swell 3 Height (m) Direction Period (s) | SE 10 | SSW 8 | SE 10 | SSW 8 | SSW 8 | S 8 | SW 8 | SE 11 | SE 11 | SE 5 | S 9 | S 9 | SE 11 | SE 11 | SE 10 | SSE 10 | SSE 17 | SE 9 | E 12 | — | — |
| kJ | 4 | 12 | 4 | 6 | 6 | 1 | 2 | 4 | 4 | 4 | 2 | 2 | 4 | 5 | 4 | 10 | 28 | 3 | 25 | — | — |
Wind waves Height (m) Direction Period (s) | — | SSE 6 | — | — | SSE 6 | — | — | S 2 | SSE 5 | — | S 3 | S 3 | — | SSE 5 | — | — | S 4 | SSW 4 | SSW 4 | S 4 | SW 8 |
| kJ | — | 7 | — | — | 7 | — | — | 1 | 6 | — | 1 | 1 | — | 2 | — | — | 3 | 3 | 2 | 13 | 58 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 69 | 43 | 69 | 101 | 104 | 80 | 69 | 104 | 77 | 43 | 77 | 12 | 10 | 77 | 12 | 41 | 43 | 0 | 77 | 77 | 76 |
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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