Surf Forecasts:
Hanamizu River surf forecast from 25 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 6AM (local time) - 3.5ft (1.0m), 12s period, S swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 9PM (local time) - 4.5ft (1.3m), 14s period, S swell with 694 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 6AM (local time) - 3.5ft (1.0m), 12s period with S 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 Wednesday (Aug 26) at 6AM. The primary swell is predicted to be 1.0m and 12s period with a secondary swell of 0.4m and 5s. Another secondary swell of 0.7m and 4s 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 1.3m 14s and forecast to arrive on Tuesday (Sep 01) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 2s period and expected on Sunday (Aug 30) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 26th Aug) | 3.5ft (1.0m) 12s |
| Best Surf | 6AM (Wed 26th Aug) | 3.5ft (1.0m) 12s |
| Most Powerful | 9PM (Tue 1st Sep) | 4.5ft (1.3m) 14s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, Rusty here, let's break down what's cookin' at Hanamizu River.
It's a slow burn to start, folks. We've got a bit of a flat spell before things get interesting.
Wednesday the 26th is the only game in town for the first few days. Hit it early morning for a glassy 3ft SSW swell with a nice long 12-second period. Water temp is about what you'd expect for late August. The energy is moderate (250), and while it's not huge, it's clean and perfect for a beginner-friendly wave. After that, things get choppy and weak. Thursday and Friday are a write-off with short-period windswell and messy winds. You're looking at a few days of poor conditions until the end of the month.
Jump ahead to Tuesday the 1st of September. The morning cleans up nicely with a 3ft SSW groundswell, 12-second period, and a light cross-offshore breeze. Energy's moderate again (250). It's a fun little wave, nothing crazy, but a solid option for a longboard.
Now, the one that's got me buzzing is Tuesday the 8th of September. We're looking at a massive 12ft S swell with a 12-second period and strong energy (3172). But here's the deal – it's predicted to be too big for this break. That's an expert-only day. The morning has a bit of a cross-shore chop, but the afternoon cleans right up with a glassy cross-offshore wind. If you're a local who knows how this river mouth handles a big south swell, that afternoon session on the 8th could be legendary. For everyone else, stay on the sand.
After that big pulse, it drops off through the 9th and 10th, but the wind gets messy again. The 10th of September has clean surf, but only 2ft with weak energy (116).
Bottom line? The Wednesday 26th of August morning glass-off is your best bet for clean, fun waves in the near term. But if you're an expert with the 8th of September marked on your calendar, that afternoon window could be a real standout. Just be smart about it.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Thu morning. Warm (max 32°C on Wed afternoon, min 24°C on Thu afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sat morning. Warm (max 26°C on Mon morning, min 22°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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 12 | SSW 12 | SSW 11 | SSW 6 | S 11 | S 10 | S 9 | SSW 8 | SSW 6 | SSW 8 | SSE 11 | SSW 8 | SSW 8 | SSE 10 | SSW 7 | S 12 | SSW 11 | SSW 10 | SSW 19 | S 16 | S 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 183 | 137 | 68 | 63 | 55 | 45 | 57 | 76 | 18 | 19 | 12 | 11 | 11 | 10 | 10 | 12 | 25 | 35 | 69 | 612 | 600 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross-off | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-on | glassy | on | cross-on | cross |
High Tide | 4:51PM1.38m | 3:36AM1.42m | 5:08PM1.43m | 4:16AM1.47m | 5:27PM1.46m | 4:55AM1.50m | 5:46PM1.49m | 5:33AM1.50m | 6:05PM1.51m | 6:13AM1.47m | 6:25PM1.51m | 6:56AM1.40m | 6:47PM1.51m | ||||||||
Low Tide | 9:55AM0.23m | 10:11PM0.85m | 10:25AM0.20m | 10:39PM0.74m | 10:54AM0.20m | 11:08PM0.63m | 11:22AM0.24m | 11:38PM0.52m | 11:50AM0.32m | 00:10AM0.43m | 12:17PM0.43m | 00:44AM0.36m | 12:44PM0.57m | 1:22AM0.32m | |||||||
 | |  |  |  |  | |  |  | | | | |  |  | | | | | | | |
 | 5:09 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — | 5:13 | — | — |
 | — | 6:19 | — | — | 6:17 | — | — | 6:15 | — | — | 6:15 | — | — | 6:14 | — | — | 6:12 | — | — | 6:10 | — |
mm | — | — | 2 | 10 | 2 | 1 | 1 | — | 6 | 2 | 1 | 3 | 1 | — | — | — | — | — | — | — | 4 |
Temp °C | 30 | 32 | 28 | 26 | 24 | 25 | 28 | 29 | 27 | 24 | 23 | 23 | 24 | 25 | 24 | 26 | 26 | 26 | 28 | 28 | 26 |
Feels °C | 35 | 35 | 31 | 30 | 26 | 27 | 30 | 32 | 30 | 27 | 24 | 25 | 26 | 27 | 27 | 29 | 29 | 30 | 31 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SSW 11 | S 6 | S 6 | S 10 | S 9 | SSE 10 | SSW 6 | SSW 8 | SSW 7 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | S 7 | SSW 11 | SSW 10 | S 10 | S 16 | S 13 |
| kJ | 183 | 137 | 68 | 23 | 18 | 45 | 57 | 9 | 18 | 19 | 11 | 11 | 11 | 6 | 10 | 4 | 25 | 35 | 44 | 612 | 600 |
Swell 2 Height (m) Direction Period (s) | S 9 | SSE 9 | SSE 9 | SSE 9 | S 11 | SSE 10 | SSE 9 | SW 9 | S 8 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | S 12 | SSW 8 | SSE 10 | SSW 19 | E 10 | E 10 |
| kJ | 83 | 49 | 31 | 28 | 55 | 9 | 8 | 3 | 12 | 11 | 12 | 10 | 10 | 10 | 10 | 12 | 7 | 9 | 69 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | E 12 | E 12 | S 10 | SW 10 | SSE 10 | SSW 10 | SW 9 | SE 15 | SSE 10 | — | SSW 8 | E 6 | ESE 5 | — | S 12 | SSE 10 | SSE 9 | S 12 | SE 10 | SE 10 | SE 10 |
| kJ | 3 | 3 | 19 | 25 | 18 | 9 | 3 | 8 | 9 | — | 6 | 1 | 2 | — | 3 | 9 | 9 | 12 | 4 | 15 | 15 |
Wind waves Height (m) Direction Period (s) | SW 4 | SSW 5 | SSW 5 | SSW 6 | NE 3 | SSW 6 | — | SSW 8 | — | — | NE 2 | — | — | NNE 2 | — | — | — | SSW 2 | S 3 | — | — |
| kJ | 11 | 30 | 40 | 63 | 1 | 10 | — | 76 | — | — | 1 | — | — | 1 | — | — | — | 1 | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 12 | 0 | 0 | 0 | 76 | 76 | 0 | 41 | 69 | 69 | 87 | 41 | 76 | 76 | 41 | 41 | 12 | 12 | 62 | 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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