Surf Forecasts:
Hanamizu River surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 12AM (local time) - 4.5ft (1.4m), 14s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 9AM (local time) - 7ft (2.1m), 16s period, S swell with 2,123 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 9PM (local time) - 3ft (0.9m), 14s period with SSE 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 (Aug 24) at 9PM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 0.3m and 19s. Another secondary swell of 0.4m and 11s 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 2.1m 16s and forecast to arrive on Wednesday (Aug 26) at 9AM. 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 3s period and expected on Sunday (Aug 23) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 24th Aug) | 3ft (0.9m) 14s |
| Best Surf | 12AM (Wed 26th Aug) | 4.5ft (1.4m) 14s |
| Most Powerful | 9AM (Wed 26th Aug) | 7ft (2.1m) 16s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cookin’ at Hanamizu River. Gotta be straight with you – the next week or so is a tough one to love. The swell is tiny and the wind just won’t play nice. We’re in a bit of a dry spell, but stick with me, because the back half of the outlook has a couple of moments that might just make it worth hanging in there.
Right now, we’ve got nothing going on. The first few days are flat or close to it, with barely a ripple and poor conditions. We’re looking at a gap of nearly a week before anything even gets close to rideable. The water is a warm 81°, which is pretty average for this time of year, nothing weird there.
Around the 25th of August, a pulse of new SSE swell starts to push in. Tuesday morning the 25th sees the swell jump to 5ft with a 16-second period – that’s some real long-period groundswell energy. The combined energy hits 1017 (moderate), so there’s some push behind it. Problem is, the wind is cross-onshore and light, keeping it from being truly clean. It’s a marginal call at best.
Now, the standout – if you can call it that – looks to be Thursday the 27th of August. The swell is a solid 8ft from the south, with a 13-second period. The combined energy is 4211 (strong). But here’s the kicker: the wind is predicted to go offshore from the NNW at 12 mph. That’s clean, glassy conditions on a decent-sized south swell. However, at 12ft, this swell is too big for this break, and the file says it’s only for experts. If you’re an experienced surfer and know the river mouth, this could be your window, but it’s a heavy one. The crowds are sometimes a factor here, so you might have company.
Friday the 28th of August offers another chance. The swell drops to 8ft from the south, still a solid size, and the wind goes glassy in the afternoon. That’s a beautiful setup for the more experienced crew, with clean conditions and a strong south swell (energy 1473). Still a bit big for the average punter.
Looking further out, the first couple of days of September bring more sizeable south swell, but the wind is messy and cross-shore, keeping the quality down. It’s a promising but less certain run for the second week. All in all, if you’re a beginner, this isn’t your week. For the experts, keep an eye on that Thursday the 27th and Friday the 28th.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 28°C on Wed afternoon, min 25°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 29°C on Sat afternoon, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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) | SE 6 | SSE 6 | SSW 8 | SSE 6 | SSW 9 | S 10 | SSW 9 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSW 9 | SW 9 | SSE 15 | SSE 14 | SSE 16 | SSE 14 | SSE 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 4 | 6 | 4 | 8 | 8 | 27 | 101 | 34 | 32 | 32 | 32 | 26 | 20 | 26 | 27 | 191 | 286 | 938 | 1121 | 811 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | glassy | on | cross-on | cross | cross-on | cross-on | cross-off | cross-on | on | off | cross | cross-on | cross | on | cross-on | cross-off | cross-on | cross-on | cross-off |
High Tide | 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 | 4:35PM1.33m | 2:52AM1.35m | ||||||||||
Low Tide | 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 | 9:21AM0.30m | 9:43PM0.96m | ||||||||||
 | |  |  |  |  | |  | | | |  | | | | | | | | | | |
 | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — |
 | — | 6:28 | — | — | 6:27 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:20 | — |
mm | — | — | — | — | — | — | — | 2 | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 28 | 29 | 27 | 27 | 27 | 26 | 28 | 28 | 27 | 29 | 30 | 27 |
Feels °C | 31 | 30 | 29 | 29 | 29 | 30 | 30 | 28 | 30 | 31 | 33 | 30 | 31 | 30 | 30 | 31 | 30 | 30 | 31 | 32 | 29 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSW 8 | SSW 9 | SE 11 | SSW 9 | SSW 9 | SSW 9 | SSW 4 | SSW 9 | SW 9 | SSW 9 | SW 9 | SSE 15 | SSE 14 | SSE 16 | SSE 14 | SSE 14 |
| kJ | 6 | 4 | 3 | 3 | 3 | 6 | 27 | 4 | 34 | 32 | 32 | 5 | 26 | 20 | 26 | 20 | 191 | 286 | 938 | 1121 | 811 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 10 | SSW 9 | S 10 | SE 11 | S 9 | SE 10 | S 4 | SE 10 | SSW 9 | SE 10 | SSE 4 | SSE 10 | SE 10 | SW 10 | SSE 18 | SW 10 | SSW 10 | S 16 |
| kJ | 4 | 4 | 4 | 4 | 8 | 8 | 4 | 2 | 4 | 4 | 4 | 32 | 4 | 2 | 10 | 17 | 87 | 257 | 17 | 10 | 651 |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SW 8 | SSW 8 | SW 8 | SE 11 | SE 11 | SE 5 | SE 5 | S 9 | SE 10 | SE 11 | SE 10 | SE 11 | SE 12 | S 16 | SSE 17 | E 12 | SW 11 | ESE 14 | — | SSW 10 |
| kJ | 6 | 3 | 6 | 2 | 4 | 4 | 4 | 1 | 2 | 4 | 5 | 4 | 5 | 5 | 5 | 27 | 11 | 114 | 62 | — | 11 |
Wind waves Height (m) Direction Period (s) | — | S 2 | — | — | SSE 2 | SSE 5 | S 3 | S 9 | SSW 3 | S 5 | S 3 | SW 3 | ENE 2 | — | — | — | SSW 10 | SSW 11 | — | SW 10 | — |
| kJ | — | 1 | — | — | 1 | 6 | 1 | 101 | 7 | 11 | 8 | 4 | 1 | — | — | — | 38 | 45 | — | 85 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 104 | 104 | 76 | 41 | 104 | 77 | 77 | 77 | 77 | 12 | 77 | 43 | 41 | 41 | 41 | 12 | 77 | 0 | 13 | 465 | 0 |
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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