Surf Forecasts:
Hanamizu River surf forecast from 13 Aug 2026:
- Best quality surf: Saturday 15 Aug, 12AM (local time) - 2.5ft (0.7m), 10s period, ESE swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 12AM (local time) - 2.5ft (0.7m), 10s period, ESE swell with 102 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 12AM (local time) - 2.5ft (0.7m), 10s period with ESE 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 Saturday (Aug 15) at 12AM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.3m and 9s. Another secondary swell of 0.3m and 10s 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 0.7m 10s and forecast to arrive on Saturday (Aug 15) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sat 15th Aug) | 2.5ft (0.7m) 10s |
| Best Surf | 12AM (Sat 15th Aug) | 2.5ft (0.7m) 10s |
| Most Powerful | 12AM (Sat 15th Aug) | 2.5ft (0.7m) 10s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s talk about what’s happening at Hanamizu River.
Look, if you’re looking to paddle out this week, you might want to sit this one out. For the next nine days, from Thursday the 13th right through to Friday the 22nd of August, the surf is basically a no-go. The swell is tiny – mostly around 1ft to 2ft – and what little energy there is, is weak (combined energy readings are mostly in the low double digits). The wind is all over the place, usually cross or cross-on, making it choppy and messy. There’s no clean, rideable surf to speak of.
Then things start to get interesting. On Sunday the 23rd of August, a proper long-period groundswell finally shows up. We’re looking at a solid 4ft SSE swell with a 15-second period, with the morning offering clean conditions and a light cross-offshore breeze. The combined energy jumps to 865 (moderate), and it's expected to be very good. This is the standout window for the entire forecast. This is a long-period groundswell, which will push through with more power, but at this river mouth setup, it might run a bit straight, so keep your eyes open. The swell pushes up to 5ft in the afternoon, but the wind turns onshore, making it questionable. For the next few days, the swell holds, but the wind turns messy, with cross-on conditions hurting the quality. By Wednesday the 26th of August, it’s solid. The morning is glassy with an 8ft S swell and a 15-second period, and combined energy is ripping at 3202 (strong). This is excellent for experienced surfers, but that’s a fair bit of water moving around; it’ll be too much for beginners. Thursday the 27th sees a massive 21ft swell hit in the morning with glassy conditions, but the file clearly states it’s just too big for this break – that’s proper, scary, expert-only territory, and even then, it might be unsurfable here. The energy reading of 17295 says it all. By Friday the 28th, the swell drops back to a manageable 4ft SSW in the morning, but the wind shifts onshore and it gets choppy again.
The water temperature is quite warm at 81°F, which is pretty normal for this time of year.
So, to wrap it up: the first week and a half is flat and rubbish. Your best bet, if you’re keen, is to circle Sunday the 23rd of August for that initial pulse. It’s a real standout for quality, but don't expect it to be perfect for long. And remember, Hanamizu River can get crowded on those days, as it’s a fairly consistent spot.
Rusty.
Short Range ForecastHeavy rain (total 25mm), heaviest during Thu night. Warm (max 29°C on Sat afternoon, min 23°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sun night. Warm (max 29°C on Tue afternoon, min 24°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | ||||||||||||||
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 9 | SSW 9 | SSW 9 | ESE 10 | SSW 11 | ESE 9 | SE 8 | SSW 9 | SSW 9 | SE 9 | SE 11 | SE 10 | SE 10 | SSW 8 | SSW 8 | SE 7 | SE 8 | SE 10 | SE 10 |
Wave Graph | |||||||||||||||||||
28 | 16 | 29 | 102 | 40 | 99 | 31 | 28 | 27 | 30 | 30 | 25 | 15 | 7 | 7 | 10 | 32 | 14 | 74 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | cross-off | cross | on | cross | cross-off | cross-on | cross | cross | on | cross-on | cross | on | cross | cross | cross-on | glassy |
High Tide | 4:59AM1.57m | 6:17PM1.48m | 5:45AM1.54m | 6:38PM1.48m | 6:30AM1.47m | 6:58PM1.47m | 7:14AM1.36m | 7:18PM1.46m | 8:00AM1.24m | 7:37PM1.44m | 8:53AM1.12m | 7:57PM1.41m | |||||||
Low Tide | 11:20PM0.74m | 11:43AM0.11m | 11:56PM0.62m | 12:15PM0.24m | 00:33AM0.52m | 12:43PM0.39m | 1:10AM0.46m | 1:08PM0.55m | 1:49AM0.43m | 1:29PM0.70m | 2:31AM0.45m | 1:44PM0.83m | |||||||
— | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | |
6:35 | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | |
mm | 9 | 4 | 6 | 4 | — | 1 | 1 | — | — | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 27 | 28 | 26 | 28 | 29 | 26 | 28 | 29 | 26 | 28 | 27 | 26 | 28 | 29 | 26 | 28 | 28 | 26 |
Feels °C | 26 | 29 | 31 | 28 | 29 | 30 | 27 | 28 | 29 | 28 | 28 | 28 | 28 | 29 | 30 | 28 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 11 | SE 8 | SE 8 | SSW 9 | SSW 9 | SE 9 | SE 11 | SE 10 | SE 10 | SSW 8 | SSW 8 | SE 7 | SE 8 | SE 7 | SE 10 |
28 | 16 | 29 | 16 | 40 | 35 | 31 | 28 | 27 | 30 | 30 | 25 | 15 | 7 | 7 | 7 | 32 | 14 | 74 | |
Swell 2 Height (m) Direction Period (s) | ESE 9 | SE 6 | SE 6 | SSE 10 | SE 6 | SSW 10 | SSW 9 | SE 7 | SSE 7 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSE 5 | SE 10 | SSE 10 | SW 8 | SE 10 | SSW 10 |
8 | 10 | 5 | 20 | 11 | 34 | 28 | 14 | 5 | 26 | 16 | 15 | 14 | 3 | 4 | 10 | 3 | 14 | 10 | |
Swell 3 Height (m) Direction Period (s) | S 12 | S 12 | SE 11 | SE 6 | SSE 9 | SE 10 | SE 10 | SE 12 | ESE 8 | SSE 11 | SE 11 | SE 11 | SE 11 | SE 10 | E 8 | SSW 8 | — | SW 8 | — |
11 | 11 | 5 | 5 | 16 | 4 | 4 | 5 | 7 | 12 | 4 | 5 | 4 | 4 | 1 | 7 | — | 3 | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | ESE 10 | ENE 2 | ESE 9 | — | NE 2 | — | — | — | — | — | — | SSE 5 | — | ENE 2 | — | — |
— | — | — | 102 | 1 | 99 | — | 1 | — | — | — | — | — | — | 2 | — | 1 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 12 | 59 | 493 | 0 | 34 | 62 | 10 | 59 | 36 | 10 | 27 | 62 | 59 | 69 | 527 | 69 | 69 | 36 | 0 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











