Surf Forecasts:
Hanamizu River surf forecast from 20 Aug 2026:
- Best quality surf: Monday 24 Aug, 9PM (local time) - 7ft (2.1m), 16s period, SSE swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 3AM (local time) - 11ft (3.5m), 12s period, S swell with 3,541 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 9PM (local time) - 2.5ft (0.8m), 9s period with SSW 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 Friday (Aug 21) at 9PM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.1m and 10s. Another secondary swell of 0.1m and 9s 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 3.5m 12s and forecast to arrive on Thursday (Aug 27) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 21st Aug) | 2.5ft (0.8m) 9s |
| Best Surf | 9PM (Mon 24th Aug) | 7ft (2.1m) 16s |
| Most Powerful | 3AM (Thu 27th Aug) | 11ft (3.5m) 12s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what’s on the table for Hanamizu River over the next couple of weeks.
First up, water temp is sitting at a pretty normal 80°F for this time of year, so warm enough for a spring suit or just boardshorts.
Truth is, we’ve got a long dry spell to kick things off. From now through the 23rd of August, it’s pretty much a write-off. The swell is tiny – we’re talking 0.7ft to 3ft of weak, short-period stuff, with combined energies barely cracking 100, and the wind is mostly rubbish. The only tiny glimmer is Saturday morning the 22nd, where it goes glassy, but with a measly 1ft on offer, it’s not worth paddling out for.
We finally see some life on the morning of Monday the 24th. The swell jumps to 4ft from the SSE with a very long 16-second period. The combined energy hits 1389, a solid kick of power. It’s surfable, but with onshore wind, it’s marginal.
The standout window is the morning of Friday the 28th. We’ve got a clean 7ft south swell with a 10-second period and a light offshore breeze from the WSW. The energy is strong at 1097, and the waves should be proper. This is the pick of the bunch for anyone who knows what they’re doing. The afternoon of the 28th looks even cleaner, going glassy with that same 7ft south swell, though the period drops a bit to 9 seconds. Still, glassy conditions on a decent-sized swell are a treat.
After that, it trails off, with a few clean mornings but much smaller waves dropping below 3ft. From the 31st onwards, you’re looking at clean, offshore winds but tiny 2ft to 2ft leftovers. Not enough grunt to get excited about unless you’re on a longboard.
So, to sum it up: the first week is a bust, but that Friday the 28th is your day. It’s a river mouth sandbar, so expect it to be peaky. Don't sleep on it.
- Rusty
Short Range ForecastModerate rain (total 15mm), heaviest on Sat night. Warm (max 28°C on Fri afternoon, min 24°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 12mm), heaviest on Wed morning. Warm (max 29°C on Tue afternoon, min 23°C on Wed morning). Wind will be generally light. | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 9 | S 10 | SSW 9 | S 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSW 9 | SE 16 | SSE 15 | SSE 16 | SSE 15 | SSE 15 | S 15 | S 16 | S 14 | S 13 | S 12 | S 12 |
Wave Graph | ||||||||||||||||||||
8 | 8 | 27 | 101 | 35 | 32 | 32 | 20 | 15 | 61 | 372 | 859 | 869 | 1951 | 2293 | 2562 | 2391 | 1497 | 1065 | 3538 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross | glassy | on | off | cross | cross-on | glassy | on | cross-on | cross-off | cross-on | cross-on | cross-off | cross | cross-on | on |
High Tide | 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 | 4:51PM1.38m | ||||||||||
Low Tide | 4:30AM0.52m | 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 | ||||||||||
— | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | |
6:27 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:20 | — | — | 6:19 | — | |
mm | — | — | 1 | 2 | 2 | — | 1 | 8 | 1 | — | — | — | — | — | — | — | 2 | 10 | 44 | 67 |
Temp °C | 27 | 26 | 27 | 28 | 26 | 28 | 28 | 27 | 26 | 26 | 26 | 27 | 28 | 26 | 28 | 29 | 27 | 25 | 23 | 26 |
Feels °C | 29 | 29 | 30 | 30 | 29 | 31 | 31 | 31 | 29 | 29 | 31 | 29 | 31 | 29 | 31 | 30 | 30 | 28 | 24 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 8 | SSW 9 | SE 11 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSW 9 | SE 16 | SSE 15 | SSE 16 | SSE 15 | SSE 15 | S 15 | S 16 | S 14 | S 13 | S 12 | E 12 |
8 | 6 | 27 | 4 | 35 | 32 | 32 | 20 | 15 | 61 | 372 | 859 | 869 | 1951 | 2293 | 2562 | 2391 | 1497 | 1065 | 11 | |
Swell 2 Height (m) Direction Period (s) | SE 11 | S 10 | SE 11 | S 9 | SE 10 | S 4 | SE 10 | SE 10 | S 5 | SSW 8 | SSW 8 | SSE 19 | SSE 18 | ESE 15 | ESE 14 | ESE 13 | ESE 13 | SSE 9 | E 12 | E 15 |
4 | 8 | 4 | 2 | 4 | 6 | 4 | 4 | 2 | 14 | 14 | 517 | 817 | 42 | 66 | 35 | 33 | 148 | 25 | 17 | |
Swell 3 Height (m) Direction Period (s) | E 6 | SE 11 | SE 5 | S 13 | S 9 | SE 10 | SE 11 | SE 11 | SE 10 | SSE 10 | E 13 | SSW 8 | SSW 9 | E 15 | SW 10 | SW 10 | SW 11 | E 12 | E 17 | — |
1 | 4 | 4 | 3 | 2 | 4 | 5 | 5 | 4 | 9 | 12 | 13 | 7 | 38 | 17 | 16 | 18 | 26 | 5 | — | |
Wind waves Height (m) Direction Period (s) | SSE 2 | SSW 3 | SSW 3 | S 9 | SSW 4 | — | S 5 | S 5 | — | SSE 4 | — | — | SSW 10 | SW 9 | — | — | — | — | SE 10 | S 12 |
1 | 3 | 2 | 101 | 11 | — | 10 | 11 | — | 4 | — | — | 52 | 30 | — | — | — | — | 200 | 3538 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 103 | 77 | 77 | 104 | 76 | 12 | 77 | 77 | 69 | 59 | 0 | 12 | 104 | 0 | 76 | 465 | 0 | 12 | 104 | 540 |
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.











