Surf Forecasts:
Hanamizu River surf forecast from 24 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6AM (local time) - 4.5ft (1.4m), 13s period, SSE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 6AM (local time) - 4.5ft (1.4m), 13s period, SSE swell with 700 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 6AM (local time) - 4.5ft (1.4m), 13s 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 Tuesday (Aug 25) at 6AM. The primary swell is predicted to be 1.4m and 13s period with a secondary swell of 0.1m and 14s. Another secondary swell of 0.4m 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 1.4m 13s and forecast to arrive on Tuesday (Aug 25) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Wednesday (Aug 26) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 25th Aug) | 4.5ft (1.4m) 13s |
| Best Surf | 6AM (Tue 25th Aug) | 4.5ft (1.4m) 13s |
| Most Powerful | 6AM (Tue 25th Aug) | 4.5ft (1.4m) 13s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's happening at Hanamizu River.
Right off the bat, I gotta be straight with you – the next week and a half is a bit of a struggle. We've got a real flat spell setting in. From Tuesday the 25th all the way through to Thursday the 3rd of September, it's pretty much a write-off for any decent waves. The energy just isn't there, with combined swell energy numbers mostly below 200 (weak) through that stretch, and the wind is nearly always putting a chop on it. You'll see some tiny bumps, but trust me, it's not worth paddling out for.
Look towards Thursday morning the 4th of September as our first real chance to blow the cobwebs off. The wind goes glassy from the NNE, which is a huge plus for a river mouth setup. We're looking at a clean 3 ft of swell, coming from the S. The period is a short 7 seconds, so it'll be a bit weak and won't have much push – surfable, but very ordinary.
Then comes the standout window, if you're brave and skilled. Sunday the 6th of September is where things get interesting, but only for the experienced crew. Sunday morning, we get a solid 6 ft of S swell riding a much longer 14-second period. That's proper groundswell energy – you can feel the weight of it. The combined energy rockets up to 1595 (moderate to strong), but the wind is cross-onshore, making it lumpy and a bit of a battle. By Sunday afternoon, it's pumping 10 ft from the S. That's big, raw power – combined energy hits 4756 (very strong) – but with a strong cross-onshore wind at 16 mph, it'll be a washing machine. This is strictly for expert surfers on a big board or a gun, and even then, it'll be a challenge.
Monday the 7th holds onto that size but the wind gets nasty – risk of thunderstorms and 22 mph cross-onshore winds making it a complete mess for surfing. Honestly, with that much swell and that much wind, the setup at Hanamizu River starts looking more like a kite-surfing zone than a paddle-surfing wave.
There is one bright spot after the storm. Tuesday morning the 8th of September. The swell drops to a still-chunky 7 ft from the S, and the wind swings around to the NNE at 9 mph, giving us clean, cross-offshore conditions. The combined energy is still a solid 865 (moderate). That's your best chance at a clean session with some power, but only if you've got the experience for 7 ft waves on a beach/sandbar break. It's still a big day, so leave the foamie at home.
So the call: The whole first week is a bust. Your one potential highlight is the morning of Tuesday the 8th of September for the experienced guys. The big swell days on the 6th and 7th are a kite-surfing dream and a paddle-surfing nightmare.
Keep your eyes on the forecasts – it's been flat, so things can only get better.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Thu afternoon. Warm (max 32°C on Tue afternoon, min 23°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sat afternoon. Warm (max 28°C on Sat morning, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | SSE 13 | SSE 12 | S 12 | SSW 12 | SSW 12 | SSW 6 | SSW 6 | S 11 | S 10 | SSW 6 | SSW 5 | SSW 8 | S 7 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSE 10 | SSE 10 | SSE 10 | S 11 |
Wave Graph | |||||||||||||||||||||
690 | 298 | 407 | 183 | 140 | 69 | 47 | 36 | 30 | 82 | 37 | 45 | 27 | 19 | 12 | 12 | 12 | 10 | 10 | 9 | 20 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross-on | cross | cross-off | cross-on | cross-off | cross-on | glassy | cross-on | off | cross | cross-on | cross | cross-off | cross-on | cross-on | cross | glassy | cross |
High Tide | 4:35PM1.33m | 2:52AM1.35m | 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 | ||||||||
Low Tide | 9:21AM0.30m | 9:43PM0.96m | 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 | |||||||
5:09 | — | — | 5:09 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:13 | — | — | |
— | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:15 | — | — | 6:15 | — | — | 6:14 | — | — | 6:12 | — | |
mm | — | — | — | — | — | — | — | 6 | 6 | — | — | — | — | 1 | — | — | — | 3 | — | — | — |
Temp °C | 31 | 32 | 27 | 31 | 32 | 28 | 31 | 30 | 25 | 27 | 27 | 27 | 28 | 28 | 26 | 27 | 26 | 25 | 25 | 26 | 26 |
Feels °C | 33 | 34 | 29 | 34 | 34 | 31 | 34 | 34 | 29 | 30 | 29 | 31 | 31 | 30 | 30 | 30 | 29 | 28 | 27 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSE 13 | SSE 12 | S 12 | SSW 12 | SSW 12 | SSW 11 | S 6 | S 11 | S 6 | SSW 7 | S 9 | SSW 8 | S 7 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | S 11 |
690 | 298 | 407 | 183 | 140 | 69 | 25 | 35 | 18 | 58 | 13 | 45 | 27 | 19 | 12 | 12 | 12 | 6 | 6 | 6 | 20 | |
Swell 2 Height (m) Direction Period (s) | E 14 | S 14 | E 13 | SSE 9 | SSE 9 | SSE 9 | SSE 8 | SE 10 | S 10 | SSE 9 | SSE 9 | SSE 10 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 |
4 | 243 | 3 | 48 | 32 | 32 | 24 | 24 | 30 | 8 | 8 | 9 | 11 | 12 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | |
Swell 3 Height (m) Direction Period (s) | ESE 14 | E 13 | ESE 13 | SSW 5 | E 12 | S 10 | SW 10 | SW 10 | SSE 10 | SW 10 | SE 15 | SE 13 | — | — | E 6 | ESE 6 | E 6 | SW 10 | SE 5 | S 11 | ESE 5 |
66 | 3 | 33 | 9 | 3 | 19 | 27 | 15 | 9 | 4 | 8 | 7 | — | — | 1 | 7 | 1 | 4 | 1 | 2 | 3 | |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 5 | SSW 5 | SW 4 | SSW 5 | SSW 6 | SSW 6 | SSW 6 | — | SSW 6 | SSW 5 | — | NNE 2 | — | ESE 3 | — | — | ESE 5 | — | SE 5 | — |
6 | 45 | 29 | 16 | 37 | 69 | 47 | 36 | — | 82 | 37 | — | 1 | — | 1 | — | — | 3 | — | 4 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 13 | 253 | 0 | 13 | 509 | 0 | 0 | 33 | 10 | 12 | 465 | 20 | 69 | 62 | 76 | 76 | 41 | 62 | 69 | 41 |
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.











