Surf Forecasts:
Hanamizu River surf forecast from 15 Aug 2026:
- Best quality surf: Friday 21 Aug, 12AM (local time) - 1.5ft (0.5m), 8s period, S swell with glassy winds.
- Most powerful swell: Saturday 15 Aug, 3PM (local time) - 2.5ft (0.8m), 10s period, ESE swell with 120 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 12AM (local time) - 1.5ft (0.5m), 8s 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 Friday (Aug 21) at 12AM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.2m and 11s. Another secondary swell of 0.5m and 8s is also forecast. 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 0.8m 10s and forecast to arrive on Saturday (Aug 15) at 3PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 21st Aug) | 1.5ft (0.5m) 8s |
| Best Surf | 12AM (Fri 21st Aug) | 1.5ft (0.5m) 8s |
| Most Powerful | 3PM (Sat 15th Aug) | 2.5ft (0.8m) 10s |
Table - best surf conditions forecast for Hanamizu River over the next 16 days.
The Lowdown
Alright, let’s have a look at what’s happening over the next couple of weeks. I’ll be straight with you: for the most part, it’s pretty quiet around here. Hanamizu River (beach/sandbar) is the only spot on the radar, and to be honest, the first week and a half are mostly a write-off. We’ve got a long stretch of tiny, weak waves and poor conditions through until the tail end of the period. The water temp is sitting around 82°F, which is pretty much spot on for this time of year, so no worries there.
The first real glimmer of hope doesn’t show up until Sunday morning, August 23rd. That morning we get glassy conditions with a small 2ft SSW swell – period is a solid 10 seconds, so it’s got a bit of push. Energy is moderate at 140. It’s surfable, but nothing to write home about. The real standout, though, is Monday morning, August 24th. That’s the one. We’ve got 4ft of SE groundswell, period stretching out to a very long 16 seconds, and glassy conditions. The energy jumps up to 736 – that’s strong. That combination of clean, lined-up swell and no wind is about as good as it gets here. This is the pick of the whole forecast. The swell is a bit long for a beach break, so expect some fat sets and longer lulls, but the shape should be there. Just be aware that size is borderline for beginners – it’s a solid chest-to-head high day for the better sandbars.
After that, the swell fades quickly. Tuesday the 25th has some energy left but the wind turns cross and the quality drops. From there, it’s back to small, messy, or onshore stuff right through to the end of August. The 30th shows a bump in period (21 seconds) on the afternoon, but with only 1ft and light onshore wind, it’s not going to be any good.
So, the clear call is Monday morning, August 24th. If you can get out there, that’s your window. Everything else is either flat or blown out.
Rusty
Short Range ForecastLight rain (total 9mm), mostly falling on Sun night. Warm (max 28°C on Sat morning, min 24°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Thu night. Warm (max 30°C on Wed afternoon, min 26°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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) | SSW 11 | ESE 10 | SSW 9 | SSW 9 | S 9 | S 9 | SSW 9 | SSW 8 | SSW 8 | SE 6 | SE 6 | SE 7 | SSE 7 | SSE 7 | SSE 6 | S 9 | S 9 | S 8 | SE 7 | S 8 | SSW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 40 | 120 | 28 | 27 | 39 | 37 | 15 | 14 | 13 | 8 | 9 | 10 | 10 | 9 | 7 | 7 | 25 | 34 | 60 | 60 | 82 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-on | cross | on | glassy | cross | cross-on | glassy | cross | cross-on | cross-off | cross | on | glassy | cross-on | cross-on | glassy | on | cross-on | cross-on |
High Tide | 6:38PM1.48m | 6:30AM1.47m | 6:58PM1.47m | 7:14AM1.36m | 7:18PM1.46m | 8:00AM1.24m | 7:37PM1.44m | 8:53AM1.12m | 7:57PM1.41m | 10:11AM1.02m | 8:20PM1.36m | 8:48PM1.29m | |||||||||
Low Tide | 12:15PM0.24m | 00:33AM0.52m | 12:43PM0.39m | 1:10AM0.46m | 1:08PM0.55m | 1:49AM0.43m | 1:29PM0.70m | 2:31AM0.45m | 1:44PM0.83m | 3:21AM0.48m | 1:46PM0.94m | 4:30AM0.52m | |||||||||
 |  |  | | | | | | | |  |  | | |  | | |  | |  | | |
 | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — |
 | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:27 | — | — | 6:24 | — |
mm | 1 | — | 3 | — | — | 3 | — | — | 2 | — | — | — | — | — | — | — | — | 2 | — | 5 | 5 |
Temp °C | 28 | 28 | 25 | 27 | 27 | 25 | 27 | 28 | 26 | 28 | 29 | 27 | 29 | 30 | 27 | 29 | 29 | 27 | 28 | 27 | 26 |
Feels °C | 30 | 29 | 27 | 28 | 30 | 27 | 30 | 31 | 30 | 30 | 31 | 32 | 32 | 33 | 32 | 32 | 32 | 32 | 31 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | SE 8 | SSE 8 | SSW 9 | S 9 | S 9 | SSW 9 | SSW 8 | SE 5 | SE 6 | SSW 8 | SE 7 | SSE 7 | SSE 7 | SSE 6 | SSE 6 | S 9 | S 8 | S 8 | SSW 11 | SSW 10 |
| kJ | 40 | 33 | 24 | 27 | 39 | 37 | 15 | 14 | 7 | 8 | 6 | 7 | 10 | 9 | 7 | 4 | 25 | 34 | 32 | 25 | 82 |
Swell 2 Height (m) Direction Period (s) | SE 6 | S 10 | SSW 9 | SE 7 | SSE 11 | SSE 11 | SE 6 | SE 11 | SSW 8 | SSW 8 | SE 10 | SSE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 11 | ESE 11 | SE 9 | SE 7 | SE 6 |
| kJ | 11 | 52 | 28 | 14 | 12 | 12 | 5 | 4 | 13 | 6 | 4 | 10 | 4 | 4 | 4 | 4 | 5 | 11 | 13 | 7 | 6 |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SE 10 | SE 12 | SSE 12 | E 10 | E 8 | SSE 11 | E 8 | SE 10 | SE 10 | E 8 | SSW 8 | SW 8 | SW 8 | SSW 8 | S 9 | SW 9 | S 13 | S 13 | SE 9 | SE 9 |
| kJ | 16 | 4 | 6 | 14 | 2 | 1 | 11 | 1 | 4 | 4 | 6 | 6 | 3 | 3 | 6 | 7 | 3 | 3 | 3 | 12 | 3 |
Wind waves Height (m) Direction Period (s) | — | ESE 10 | — | — | — | — | — | SSE 5 | — | — | SE 6 | — | — | — | — | — | SSE 6 | ESE 8 | SE 7 | S 8 | S 3 |
| kJ | — | 120 | — | — | — | — | — | 6 | — | — | 9 | — | — | — | — | — | 3 | 32 | 60 | 60 | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 19 | 41 | 27 | 10 | 43 | 27 | 104 | 41 | 62 | 69 | 41 | 12 | 69 | 69 | 69 | 69 | 62 | 0 | 62 | 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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