Surf Forecasts:
Yonabaru surf forecast from 18 Aug 2026:
- Best quality surf: Friday 21 Aug, 12PM (local time) - 3ft (0.9m), 7s period, SE swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 6PM (local time) - 10ft (3.0m), 9s period, SE swell with 1,473 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 12PM (local time) - 3ft (0.9m), 7s period with SE swell.
Best Forecast Surf Conditions for Yonabaru this week:
The surf forecast for Yonabaru over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 12PM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.9m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Yonabaru in the next 16 days are 3.0m 9s and forecast to arrive on Thursday (Aug 20) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 8s period and expected on Saturday (Aug 22) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Fri 21st Aug) | 3ft (0.9m) 7s |
| Best Surf | 12PM (Fri 21st Aug) | 3ft (0.9m) 7s |
| Most Powerful | 6PM (Thu 20th Aug) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, let’s talk Yonabaru. Rusty here.
Water temp is about 84°F right now, which is normal for this time of year.
The first week is a total bummer. From Tuesday 18th August through Monday 24th August, the surf is poor. Onshore winds, small, short-period junk, or just flat. Friday 21st August afternoon sees a little clean-up with cross-offshore wind, but the swell is only 4ft and short period (7 seconds). Not worth the drive.
Saturday 22nd August is flat – 0.7ft to 2ft, offshore wind but no waves.
Sunday 23rd through Monday 24th is back to onshore wind and flat, long-period leftovers. A real dead spell.
Then it gets good. Wednesday 26th August afternoon, the wind goes glassy, and we get a solid groundswell – 8ft from the ESE, 14-second period. The combined energy is strong (2089). This is a proper pulse.
Thursday 27th August is the absolute standout. Morning has 10ft swell from the ESE, 15-second period, glassy wind. The afternoon is even better – same size, same period, energy hits 4128. This is clean, powerful, and excellent for experienced surfers. The long period (15 seconds) might make it a bit straight at a beach break, but Yonabaru is fairly exposed, so it should be fine.
From Friday 28th August, the swell gets huge – 12ft to 20ft. Wind stays glassy, but the size is too big for this break. It’s expert-only territory.
The swell backs off at the end of August and into September, but the wind turns onshore, making it messy. There’s a small window on Tuesday 1st September afternoon with 6ft from the ENE and clean cross-offshore wind.
The best session is Thursday 27th August. Glassy, solid, long-period swell, and lots of energy. Get on it.
Rusty.
Short Range ForecastHeavy rain (total 63mm), heaviest during Fri morning. Warm (max 28°C on Tue afternoon, min 26°C on Thu afternoon). Winds decreasing (fresh winds from the ESE on Thu morning, light winds from the SSE by Thu night). | Days 5-7 Weather SummaryHeavy rain (total 161mm), heaviest during Sat night. Warm (max 28°C on Mon morning, min 25°C on Sat afternoon). Winds decreasing (fresh winds from the SW on Fri night, light winds from the WNW by Sat afternoon). | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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) | E 6 | E 7 | E 7 | ESE 7 | ESE 8 | ESE 8 | SE 8 | SE 8 | ESE 7 | ESE 7 | ENE 9 | ENE 9 | SE 9 | ENE 9 | E 14 | E 14 | ESE 11 | ENE 13 | E 10 | E 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 139 | 229 | 315 | 345 | 545 | 527 | 1009 | 547 | 243 | 149 | 8 | 8 | 42 | 16 | 14 | 6 | 23 | 56 | 34 | 31 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | off | cross-off | cross | cross-on | cross-on | cross-on | on | on | on |
High Tide | 9:57PM2.05m | 10:40AM1.79m | 10:31PM1.99m | 11:45AM1.63m | 11:12PM1.91m | 1:25PM1.53m | 00:10AM1.84m | 3:38PM1.57m | 1:38AM1.79m | 4:55PM1.69m | 3:12AM1.83m | 5:37PM1.81m | ||||||||
Low Tide | 3:47PM0.79m | 4:26AM0.65m | 4:20PM0.97m | 5:20AM0.70m | 4:58PM1.15m | 6:30AM0.74m | 5:55PM1.32m | 8:02AM0.73m | 7:49PM1.42m | 9:29AM0.65m | 9:46PM1.39m | 10:33AM0.53m | 10:52PM1.26m | |||||||
 |  |  | | | | | | | | |  | | | | | | |  |  | |
 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — |
 | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — |
mm | — | 3 | 3 | 5 | 5 | 2 | 7 | 22 | 16 | 29 | 17 | 9 | 32 | 67 | 5 | 1 | 1 | — | — | — |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 27 | 27 | 28 | 28 | 27 |
Feels °C | 29 | 30 | 30 | 29 | 29 | 29 | 28 | 29 | 31 | 30 | 28 | 30 | 31 | 27 | 29 | 28 | 27 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 8 | SSW 8 | S 10 | SW 9 | S 10 | S 9 | S 9 | E 14 | SW 9 | SW 10 | SW 11 | SW 11 | SW 11 | SW 9 | E 11 | SW 10 | SSW 8 |
| kJ | 34 | 35 | 18 | 10 | 22 | 118 | 12 | 225 | 264 | 286 | 4 | 235 | 392 | 116 | 377 | 249 | 163 | 20 | 59 | 192 |
Swell 2 Height (m) Direction Period (s) | S 7 | S 7 | S 7 | S 8 | SW 8 | SW 9 | SW 9 | SW 9 | SW 10 | ESE 7 | ENE 9 | ENE 9 | SE 9 | ENE 9 | E 9 | SE 13 | E 10 | E 13 | E 10 | E 10 |
| kJ | 8 | 4 | 4 | 11 | 11 | 12 | 28 | 12 | 17 | 77 | 8 | 8 | 42 | 16 | 6 | 6 | 7 | 14 | 34 | 31 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | — | S 8 | — | — | — | SW 9 | NE 8 | SW 10 | E 14 | E 14 | ENE 9 | E 16 | E 14 | E 14 | ESE 11 | ENE 13 | E 13 | SW 10 |
| kJ | 4 | 4 | — | 1 | — | — | — | 39 | 18 | 133 | 4 | 4 | 15 | 5 | 14 | 4 | 23 | 56 | 14 | 25 |
Wind waves Height (m) Direction Period (s) | E 6 | E 7 | E 7 | ESE 7 | ESE 8 | ESE 8 | SE 8 | SE 8 | ESE 7 | ESE 7 | S 9 | S 8 | S 9 | S 9 | S 8 | S 9 | SSE 8 | S 8 | SSE 8 | ESE 5 |
| kJ | 139 | 229 | 315 | 345 | 545 | 527 | 1009 | 547 | 243 | 149 | 822 | 1086 | 999 | 1169 | 754 | 1051 | 497 | 593 | 373 | 25 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1033 | 14 | 670 | 785 | 599 | 670 | 727 | 599 | 13 | 0 | 599 | 670 | 12 | 607 | 13 | 607 | 607 | 599 | 13 | 13 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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Information about the Yonabaru Surf forecast
The above surf forecast table for Yonabaru provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Yonabaru can be found by selecting the local surf guide option on the grey menu. Our Yonabaru 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 (Yonabaru) 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 Yonabaru 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.
Yonabaru is 5 km (3 miles) from the city of Ginowan. If you plan a holiday in Okinawa, look for hotels and other accommodation in Ginowan. Ginowan has rooms for a wide range of budgets as well as car hire and transport links.
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