Surf Forecasts:
Hanamizu River surf forecast from 12 Aug 2026:
- Best quality surf: Saturday 15 Aug, 6AM (local time) - 1.5ft (0.5m), 11s period, S swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 3PM (local time) - 3ft (0.9m), 9s period, SE swell with 120 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 6AM (local time) - 1.5ft (0.5m), 11s 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 Saturday (Aug 15) at 6AM. The primary swell is predicted to be 0.5m and 11s period with a secondary swell of 0.4m and 5s. 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 0.9m 9s and forecast to arrive on Saturday (Aug 15) at 3PM. Winds are predicted to be 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 16) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sat 15th Aug) | 1.5ft (0.5m) 11s |
| Best Surf | 6AM (Sat 15th Aug) | 1.5ft (0.5m) 11s |
| Most Powerful | 3PM (Sat 15th Aug) | 3ft (0.9m) 9s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down the next couple of weeks.
Honestly, the first ten days or so are a real dry spell. Tiny, weak swells and mostly cross or cross-onshore winds make it tough to get excited. The combined swell energy is barely a whisper (values like 55, 32, 38). Water temp is about what you’d expect for this time of year.
The first real chance comes on Saturday the 22nd of August. It’s small—only 0.6m of swell from the south, with a 10-second period and weak energy (82). But the morning is glassy, so it’s a clean little knee-high wave for beginners. If you’re desperate, that’s your best early bet.
Then we get a standout: Tuesday the 25th of August. The morning brings a solid 2.5m of swell from the SSE, with a very long 17-second period and energy cranked to 3646. That’s powerful groundswell, but the wind is cross-onshore, so it’s messy. The long period will make the waves fat and tricky at a beachy spot like Hanamizu River. This is strictly for experts, and even then, it’s a handful. The afternoon still has 2.4m of swell with a 15-second period and 2555 energy, still strong but rough.
Wednesday the 26th of August morning has 1.2m of swell from the SSE (11 seconds, 684 energy) but again cross-onshore. After that, it fades back into small, crummy conditions.
So, bottom line: beginners, aim for the 22nd morning for a tiny, clean session. Experts, the 25th morning has size and power, but it’s a windy, challenging day. The rest is a long quiet stretch.
Rusty
Short Range ForecastHeavy rain (total 22mm), heaviest during Thu afternoon. Warm (max 29°C on Sat afternoon, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sun morning, min 22°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSE 10 | S 11 | SE 9 | SSW 9 | SSW 10 | SE 10 | SE 10 | SE 10 | SSW 9 | SE 10 | SSW 8 | SSW 8 | SSE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 39 | 50 | 31 | 28 | 16 | 28 | 20 | 63 | 120 | 29 | 31 | 29 | 23 | 27 | 15 | 15 | 7 | 7 | 8 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross | on | cross | cross-off | cross | cross-off | cross | on | glassy | glassy | cross-on | cross |
High Tide | 4:10AM1.55m | 5:55PM1.48m | 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 | |||||||
Low Tide | 10:44PM0.87m | 11:08AM0.03m | 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 | ||||||
 |  |  | | | | | |  |  | | | |  | |  | | | | |
 | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — |
 | 6:36 | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — |
mm | 2 | 1 | 5 | 4 | 4 | 2 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 29 | 26 | 28 | 28 | 26 | 28 | 27 | 26 | 26 | 27 | 25 |
Feels °C | 27 | 29 | 31 | 29 | 30 | 31 | 28 | 28 | 31 | 27 | 28 | 29 | 27 | 28 | 28 | 29 | 27 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | S 11 | S 10 | SSW 9 | SSW 10 | SSW 9 | SE 10 | SSW 9 | SSW 9 | SE 10 | SSW 8 | SSW 8 | SSE 9 |
| kJ | 39 | 50 | 31 | 28 | 16 | 28 | 16 | 63 | 55 | 29 | 31 | 29 | 23 | 16 | 15 | 15 | 7 | 7 | 8 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | SE 11 | E 10 | S 12 | S 12 | SE 6 | SSE 10 | SE 6 | SE 8 | SE 7 | SE 9 | SE 10 | SSW 9 | SE 10 | ESE 10 | SSW 8 | SSE 6 | SE 10 | SSW 8 |
| kJ | 7 | 5 | 2 | 11 | 11 | 6 | 20 | 12 | 33 | 15 | 13 | 24 | 16 | 27 | 10 | 7 | 3 | 4 | 7 |
Swell 3 Height (m) Direction Period (s) | SE 12 | — | SE 12 | ESE 9 | ESE 7 | SE 11 | SE 5 | SSE 9 | SE 10 | ESE 10 | SSE 12 | SSE 11 | SSE 11 | SSE 11 | SE 11 | SE 11 | SE 10 | SE 7 | SE 10 |
| kJ | 5 | — | 5 | 8 | 5 | 5 | 4 | 15 | 4 | 9 | 13 | 12 | 12 | 12 | 5 | 4 | 4 | 2 | 4 |
Wind waves Height (m) Direction Period (s) | — | NNE 2 | — | — | NNE 2 | — | — | — | SE 9 | NE 3 | NNE 3 | E 2 | — | — | — | — | — | — | S 3 |
| kJ | — | 1 | — | — | 1 | — | — | — | 120 | 2 | 3 | 1 | — | — | — | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 12 | 20 | 59 | 12 | 59 | 59 | 12 | 34 | 33 | 27 | 27 | 10 | 12 | 10 | 59 | 12 | 41 | 43 | 62 |
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.
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