Surf Forecasts:
Yonabaru surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 3AM (local time) - 7ft (2.1m), 14s period, ESE swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 3AM (local time) - 7ft (2.1m), 14s period, ESE swell with 1,848 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 6PM (local time) - 6.5ft (2.0m), 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 6PM. The primary swell is predicted to be 2.0m and 7s period with a secondary swell of 0.5m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Yonabaru in the next 16 days are 2.1m 14s and forecast to arrive on Wednesday (Aug 26) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 8s period and expected on Sunday (Aug 23) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Fri 21st Aug) | 6.5ft (2.0m) 7s |
| Best Surf | 3AM (Wed 26th Aug) | 7ft (2.1m) 14s |
| Most Powerful | 3AM (Wed 26th Aug) | 7ft (2.1m) 14s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here again, looking at the same stretch for Yonabaru. Let me tell you, the first week is a total bust. From Wednesday the 19th all the way through Tuesday the 25th, it’s just no good. Thunderstorms, onshore winds blowing 15 to 25 mph, and tiny, weak, crappy swell. The combined wave energy is pathetic, mostly under 100, and the water temp is just normal for the season. Don’t even bother waxing up.
Then, on Wednesday the 26th, we finally get a window. The morning brings a clean cross-offshore breeze from the NNW at 9 mph, and a solid 8ft swell from the ESE. That’s a groundswell with a 14-second period, so it’s got some real punch. The combined energy is 2379, which is strong. The wave comment says "excellent surf conditions for experienced surfers," and that’s the truth. The period is long, so it’ll be better at a point or reef, but for a beach break, it’s still the best you’ll see. This is the standout.
After that, it gets huge. Thursday the 27th through Saturday the 29th, we’re looking at 15ft to 23ft swell with energy readings in the five figures (9661, 11046, even 22367). That’s massive, dangerous, and only for the big-wave crew. The wind is offshore on Thursday, but the swell is just too big for Yonabaru. Friday and Saturday are even worse with choppy, cross-onshore winds.
The following week, from Sunday the 30th to Thursday the 3rd of September, it’s still big (8ft to 13ft), but the winds are messy and cross-onshore. The energy is still strong, but the quality is marginal. Not worth the paddle unless you’re desperate.
So, your only real shot is Wednesday the 26th morning. That’s the one. The rest is either too big, too messy, or both. Stay safe out there.
Rusty.
Short Range ForecastHeavy rain (total 51mm), heaviest during Thu night. Warm (max 28°C on Tue night, min 26°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 38mm), heaviest during Sat night. Warm (max 28°C on Sat morning, min 26°C on Fri night). Winds increasing (light winds from the SSE on Fri night, strong winds from the ESE by Sun night). | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 7 | E 7 | E 7 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | ENE 8 | SE 8 | SE 8 | ENE 9 | SSE 8 | E 13 | ENE 9 | ENE 10 | S 10 | ENE 12 | E 10 | ESE 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 226 | 257 | 366 | 368 | 300 | 242 | 329 | 26 | 438 | 824 | 8 | 0 | 14 | 16 | 18 | 0 | 46 | 19 | 140 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | cross-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 | 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 | 2 | 4 | 5 | 8 | 3 | 4 | 13 | 6 | 6 | 8 | 5 | 3 | 9 | 3 | 2 | 4 | 2 | 2 | 3 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 26 | 28 | 27 | 27 | 28 | 28 | 27 | 28 | 27 | 27 |
Feels °C | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 31 | 30 | 29 | 29 | 27 | 27 | 26 | 24 | 28 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | S 8 | S 8 | S 10 | S 9 | S 9 | ESE 11 | SE 8 | SSW 9 | SW 10 | SW 10 | SW 10 | W 7 | W 7 | W 7 | W 8 | E 10 | SSW 8 |
| kJ | 35 | 18 | 11 | 35 | 118 | 170 | 189 | 11 | 438 | 450 | 471 | 667 | 212 | 10 | 9 | 1 | 5 | 19 | 240 |
Swell 2 Height (m) Direction Period (s) | S 7 | S 8 | SW 8 | SW 8 | SW 9 | SW 9 | S 9 | ENE 8 | SW 9 | SSW 10 | ENE 9 | — | E 13 | W 8 | E 14 | W 9 | ENE 12 | E 14 | ENE 10 |
| kJ | 4 | 5 | 10 | 11 | 12 | 12 | 83 | 26 | 294 | 511 | 8 | — | 14 | 18 | 16 | 2 | 46 | 14 | 58 |
Swell 3 Height (m) Direction Period (s) | SE 10 | S 8 | S 7 | — | SW 9 | ENE 8 | SW 9 | ESE 10 | ESE 10 | NE 9 | E 10 | — | — | ENE 9 | ENE 10 | W 7 | W 8 | W 7 | W 6 |
| kJ | 4 | 1 | 1 | — | 12 | 28 | 12 | 10 | 38 | 3 | 2 | — | — | 16 | 18 | 1 | 6 | 4 | 1 |
Wind waves Height (m) Direction Period (s) | E 7 | E 7 | E 7 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | SSE 8 | — | SE 8 | SSE 8 | SSE 8 | SSE 8 | S 9 | SSE 9 | S 10 | SSE 9 | SSE 8 | ESE 6 |
| kJ | 226 | 257 | 366 | 368 | 300 | 242 | 329 | 618 | — | 824 | 670 | 773 | 1026 | 1790 | 1414 | 1432 | 808 | 589 | 140 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 14 | 777 | 839 | 599 | 607 | 607 | 13 | 599 | 13 | 607 | 13 | 607 | 599 | 670 | 599 | 599 | 616 | 634 | 607 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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