Surf Forecasts:
Hanamizu River surf forecast from 21 Aug 2026:
- Best quality surf: Monday 24 Aug, 9PM (local time) - 5.5ft (1.7m), 16s period, SSE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 12AM (local time) - 6ft (1.8m), 15s period, SSE swell with 1,441 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 12AM (local time) - 1.5ft (0.5m), 13s 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 (Aug 24) at 12AM. The primary swell is predicted to be 0.5m and 13s period with a secondary swell of 0.3m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Hanamizu River in the next 16 days are 1.8m 15s and forecast to arrive on Tuesday (Aug 25) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Saturday (Aug 22) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 24th Aug) | 1.5ft (0.5m) 13s |
| Best Surf | 9PM (Mon 24th Aug) | 5.5ft (1.7m) 16s |
| Most Powerful | 12AM (Tue 25th Aug) | 6ft (1.8m) 15s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright folks, Rusty here. We're looking at a pretty lean stretch for Hanamizu River. The first good news doesn't show up until Monday, August 24th, so we’ve got a few days of flat to tiny, messy conditions to sit through. The water's sitting at a warm 80.8°, which is right about average for this time of year, so at least you won't be freezing while you're waiting.
The first real pulse arrives Monday morning, August 24th. We've got some SSE groundswell building to 2 ft with a very long 20-second period. Now, that long period is a classic double-edged sword – it means the wave energy is solid (moderate energy at 587) and the shape should be there, but at a sandbar setup like this, those long-period swells can jack up and close out straight. Still, with glassy morning conditions, it's the best it's gonna get that day. The afternoon jumps up to 4 ft but gets choppy fast.
The standout of the whole run is Tuesday morning, August 25th. Swell hits 5 ft from the south, still with that long 14-second period, delivering strong energy (1315). It's pushing the upper limits for a beginner spot, but for the average surfer, this is the best size on offer. The wind is light and cross-onshore, so it'll be a little bumpy, but manageable. This is your call.
Everything after that drops back into the ordinary. We get a few mornings with marginal knee-to-waist high swell through the end of the month, but the wind is persistently cross-onshore. There's a brief window Friday afternoon, August 28th, with offshore NNW wind cleaning up a weak 2.5 ft southerly, but the period is a short 8 seconds. It'll be rideable but gutless.
The first week of September looks like more of the same. Slight improvement on Saturday afternoon, September 5th, with a 3 ft south swell and a better 14-second period. Still light cross-onshore, so it won't be perfect, but it's a reasonable way to close out the forecast. Don't expect any fireworks.
Overall, it’s a patient man’s game. Get on that Tuesday morning, or settle for the scraps.
Short Range ForecastModerate rain (total 15mm), heaviest on Sat night. Warm (max 28°C on Sat morning, min 25°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Wed afternoon, min 26°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SE 13 | SE 13 | SSE 20 | SSE 16 | SSE 15 | S 14 | S 14 | S 14 | SSW 13 | S 13 | SSW 12 | SSW 11 | S 10 | S 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 101 | 35 | 32 | 32 | 31 | 25 | 27 | 82 | 301 | 697 | 1441 | 912 | 1179 | 1036 | 679 | 835 | 203 | 99 | 268 | 105 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | glassy | cross-on | cross-off | cross | cross-on | glassy | cross-on | cross-on | cross-off | cross-on | cross-on | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 8:48PM1.29m | 9:51PM1.23m | 4:23PM1.21m | 00:27AM1.21m | 4:23PM1.27m | 1:56AM1.27m | 4:35PM1.33m | 2:52AM1.35m | 4:51PM1.38m | 3:36AM1.42m | 5:08PM1.43m | |||||||||
Low Tide | 6:10AM0.53m | 7:42AM0.47m | 8:28PM1.14m | 8:39AM0.38m | 9:13PM1.05m | 9:21AM0.30m | 9:43PM0.96m | 9:55AM0.23m | 10:11PM0.85m | 10:25AM0.20m | 10:39PM0.74m | |||||||||
 |  |  | |  | | |  |  | | | | | | | | | | |  | |
 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | 5:09 | — | — |
 | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — |
mm | 2 | — | — | 3 | 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — |
Temp °C | 27 | 26 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 28 | 29 | 27 | 29 | 30 | 27 | 28 | 28 | 26 |
Feels °C | 29 | 29 | 31 | 32 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 32 | 30 | 29 | 32 | 30 | 30 | 30 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SE 11 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SE 13 | SSE 12 | SSE 16 | SSE 15 | S 14 | S 14 | S 14 | SSW 13 | SSW 13 | SSW 12 | SSW 11 | — | SSE 10 |
| kJ | 4 | 35 | 32 | 32 | 31 | 25 | 14 | 82 | 129 | 697 | 1441 | 912 | 1179 | 1036 | 679 | 769 | 203 | 99 | — | 9 |
Swell 2 Height (m) Direction Period (s) | S 9 | SE 10 | S 5 | SE 10 | S 5 | SE 10 | SE 13 | SSW 8 | SSE 20 | SSE 18 | ESE 11 | S 18 | ESE 13 | ESE 13 | SE 10 | SSE 9 | SSE 9 | E 15 | — | SE 14 |
| kJ | 2 | 4 | 7 | 4 | 4 | 4 | 27 | 14 | 301 | 432 | 25 | 399 | 59 | 33 | 26 | 108 | 32 | 4 | — | 8 |
Swell 3 Height (m) Direction Period (s) | S 13 | S 9 | SE 10 | SE 11 | SE 10 | SE 13 | SSE 4 | S 20 | SSE 17 | SW 9 | E 15 | SW 10 | SW 10 | SW 10 | SSW 15 | E 12 | S 16 | — | E 14 | ESE 13 |
| kJ | 3 | 2 | 4 | 5 | 4 | 7 | 2 | 8 | 157 | 3 | 17 | 4 | 16 | 4 | 279 | 25 | 5 | — | 14 | 34 |
Wind waves Height (m) Direction Period (s) | S 9 | SSW 4 | W 3 | S 5 | — | — | — | — | — | SSW 8 | SW 10 | — | S 4 | — | — | S 13 | SSW 4 | S 8 | S 10 | S 8 |
| kJ | 101 | 7 | 2 | 7 | — | — | — | — | — | 13 | 60 | — | 12 | — | — | 835 | 18 | 91 | 268 | 105 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 77 | 76 | 43 | 77 | 69 | 69 | 41 | 0 | 27 | 77 | 0 | 13 | 77 | 0 | 13 | 77 | 104 | 104 | 104 | 13 |
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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