Surf Forecasts:
Yonabaru surf forecast from 17 Aug 2026:
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 8ft (2.5m), 18s period, ESE swell with 4,059 kJ wave energy.
Best Forecast Surf Conditions for Yonabaru this week:
The most powerful waves expected at Yonabaru in the next 16 days are 2.5m 18s and forecast to arrive on Tuesday (Aug 25) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 8s period and expected on Thursday (Aug 20) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Tue 25th Aug) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright crew, Rusty here. Let’s break down Yonabaru.
Right now and for the next week, it’s a dud. Easterly winds and short-period slop are making a mess. The first real mention doesn’t come until Tuesday, 25th August, and even that’s a borderline call – more of a heads-up than a go.
We’ve got a full week of nothing from Tuesday 18th through Monday 24th – poor surf, choppy and cross-onshore. Water temp is sitting at 84.2° with a tiny anomaly of 0.4°, so pretty normal for this time of year.
The big standout, and the one to mark on your calendar, is Wednesday 26th August. Swell hits 11.5 ft from the ESE with a long 16-second period – that’s proper groundswell energy (6469). It’s huge though. For a beginner spot like Yonabaru, that’s way too much. Expert-only stuff. Wind is cross-onshore from the NE at 12 mph, which will put some texture on it, but it’s doable if you’ve got the guts.
Thursday 27th August is another monster – 14.8 ft to 16.4 ft from the E, period around 15-16 seconds (11579 to 13286). Again, big and intimidating. The wind goes cross-off from the NNW by the afternoon, which should clean it up nicely, but only for the brave.
Friday 28th August starts with a big 14.8 ft swell from the E (9202) and clean cross-off winds from the WNW. By the afternoon it drops to 8.2 ft from the ESE (1335), still clean but the quality drops. That morning session is the best-looking window for experienced surfers – big, clean, and powerful.
From Saturday 29th August onward, the swell dies back to under 2 ft, and we’re back to poor conditions. The energy fades to weak levels (under 100) and it’s not worth paddling out.
So, bottom line: if you’re a beginner, skip this whole period. For the experts, Wednesday 26th and Friday 28th morning are your windows – big, long-period ESE swells with manageable winds. The rest is either blown out or flat.
Stay safe out there.
Short Range ForecastHeavy rain (total 108mm), heaviest during Thu night. Warm (max 28°C on Tue morning, min 26°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 157mm), heaviest during Fri morning. Warm (max 29°C on Sun afternoon, min 26°C on Fri morning). Winds decreasing (fresh winds from the SE on Fri morning, light winds from the ESE by Fri night). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | E 6 | E 6 | E 6 | E 7 | E 7 | ESE 8 | SE 8 | SE 8 | ENE 8 | ESE 10 | ENE 8 | E 6 | SSE 6 | SSE 6 | SE 10 | SSE 5 | SSE 6 | ESE 17 | ESE 16 | ESE 17 | ESE 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 122 | 108 | 153 | 217 | 192 | 318 | 362 | 489 | 24 | 10 | 22 | 24 | 143 | 124 | 15 | 67 | 57 | 117 | 635 | 1608 | 2432 |
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-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on |
High Tide | 9:50AM1.95m | 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 | — | — | 6:01 | — | — | 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 | 1 | — | 2 | 3 | 5 | 12 | 6 | 3 | 76 | 140 | 4 | 8 | 3 | 2 | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 26 | 26 | 27 | 27 | 27 | 27 | 28 | 29 | 27 | 28 | 28 | 26 |
Feels °C | 29 | 29 | 28 | 30 | 31 | 29 | 28 | 29 | 27 | 27 | 26 | 29 | 28 | 28 | 29 | 29 | 31 | 29 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | SW 8 | S 8 | S 9 | S 9 | SW 9 | ENE 8 | SW 10 | SW 8 | SW 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | ESE 16 | ESE 17 | ESE 18 |
| kJ | 35 | 34 | 35 | 18 | 12 | 37 | 78 | 12 | 24 | 28 | 80 | 77 | 179 | 160 | 217 | 177 | 154 | 154 | 635 | 1608 | 2432 |
Swell 2 Height (m) Direction Period (s) | S 7 | E 9 | S 7 | S 8 | SW 8 | SW 8 | SW 9 | ENE 8 | SW 9 | SW 11 | ENE 8 | E 6 | E 7 | E 9 | SE 10 | SE 10 | SE 9 | S 7 | SSW 10 | SSW 8 | S 8 |
| kJ | 9 | 27 | 4 | 11 | 10 | 11 | 12 | 41 | 12 | 18 | 22 | 24 | 1 | 6 | 15 | 15 | 14 | 34 | 151 | 108 | 74 |
Swell 3 Height (m) Direction Period (s) | SE 10 | S 7 | SE 10 | S 8 | ESE 10 | S 10 | S 10 | SW 9 | — | ESE 10 | ESE 10 | SW 10 | E 14 | E 14 | E 9 | E 9 | ESE 15 | ESE 17 | ESE 12 | ENE 10 | E 10 |
| kJ | 16 | 8 | 4 | 12 | 10 | 2 | 8 | 39 | — | 10 | 18 | 64 | 4 | 4 | 14 | 14 | 42 | 117 | 47 | 100 | 46 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | E 7 | E 7 | ESE 8 | SE 8 | SE 8 | SSE 8 | SSE 8 | SSE 8 | S 8 | SSE 6 | SSE 6 | SSE 7 | SSE 5 | SSE 6 | ESE 4 | SE 8 | E 6 | — |
| kJ | 122 | 108 | 153 | 217 | 192 | 318 | 362 | 489 | 551 | 422 | 394 | 185 | 143 | 124 | 136 | 67 | 57 | 16 | 29 | 15 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 13 | 14 | 14 | 670 | 820 | 13 | 607 | 13 | 599 | 622 | 607 | 13 | 13 | 670 | 599 | 607 | 622 | 13 | 13 | 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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