Surf Forecasts:
Yonabaru surf forecast from 28 Aug 2026:
- Best quality surf: Wednesday 2 Sep, 9PM (local time) - 4ft (1.2m), 10s period, E swell with offshore winds.
- Most powerful swell: Monday 31 Aug, 9AM (local time) - 11ft (3.5m), 10s period, E swell with 2,011 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 9PM (local time) - 4ft (1.2m), 10s period with E 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 Wednesday (Sep 02) at 9PM. The primary swell is predicted to be 1.2m and 10s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Yonabaru in the next 16 days are 3.5m 10s and forecast to arrive on Monday (Aug 31) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 10s period and expected on Wednesday (Sep 02) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 2nd Sep) | 4ft (1.2m) 10s |
| Best Surf | 9PM (Wed 2nd Sep) | 4ft (1.2m) 10s |
| Most Powerful | 9AM (Mon 31st Aug) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here again, this time in feet, miles per hour, and Fahrenheit. Let’s break it down.
This 16-day run for Yonabaru is mostly a dud. The first week and a half is hammered by onshore winds and messy surf. It’s not until early September that we see a brief window of clean conditions.
Starting Friday the 28th of August through the weekend, the swell is 5 to 7 feet, but it’s short-period junk from the SE and ESE, only 6 to 7 seconds between waves. Wind is a fresh cross-onshore at 18 to 22 mph, so it’s lumpy and choppy. Water temp is about 84°, pretty normal for this time of year. The combined swell energy is weak to moderate, between 220 and 346. Not worth getting wet.
Monday the 31st of August pumps up to 10 to 12 feet, but that’s from a strong easterly swell with an onshore wind hitting 25 mph. Energy is over 2000 (2011), but the quality is terrible. That size is only for experts even in good conditions, and with that wind, it’s a mess.
The first few days of September are rough. Tuesday the 1st still has thunderstorms and cross-shore winds. Swell drops to about 7 feet, still messy. On Wednesday the 2nd, the wind finally swings to the WSW, going cross-offshore in the morning and fully offshore by the afternoon. We get a clean 4-foot easterly swell with a 10-second period. Energy is moderate (327 to 313). It’s the cleanest we’ve seen, but still just marginal.
The best call of the whole run is Thursday the 3rd of September. Morning is clear with a moderate offshore breeze from the west at 12 mph, and by afternoon it’s WNW offshore. Swell holds around 5 to 6 feet from the ESE, with a 10-second period giving you decent shape. Energy is moderate (377 to 659). This is the only day with clean, ridable waves and offshore wind. Yonabaru is a beginner-friendly spot that breaks fairly consistently, so paddling out will actually be fun. Crowds are possible here, so expect company.
After that, it’s back downhill. Friday the 4th and into the weekend of the 5th and 6th of September, the wind turns back onshore or cross-shore, and the swell jumps to 7 to 10 feet, some of it with a long 11-second period. Energy gets strong (810 to 2221), but the conditions are too messy. By Monday the 7th, the swell collapses – 0.5 feet on Monday afternoon, then under 1 foot on Tuesday the 8th. That’s a dead spell.
From the 8th through the 12th of September, it’s a mix of tiny waves and building, stormy swells. On the 11th, a 8-foot ESE groundswell with a 14-second period shows up – energy is very strong (2628) – but wind is cross-onshore again at 18 mph, so it’s lumpy and dangerous. By the 12th, we’re talking 13-foot swells with 14 to 15-second periods, energy readings of 6527 to 8573, but those come with fresh onshore winds and thunderstorms. Only experts would even think about it, and with that wind, it’s more of a kite-surfing setup. Not for paddlers.
So, to wrap it up: the only surf worth your time is Thursday the 3rd of September at Yonabaru. It won’t be firing, but it’ll be clean and fun. The rest is either blown out, too big, or flat. Hope something changes, but for now, that’s the story.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Sun night. Warm (max 29°C on Fri afternoon, min 27°C on Sat night). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 29mm), heaviest during Mon afternoon. Warm (max 28°C on Mon afternoon, min 27°C on Mon morning). Mainly strong winds. | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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) | SE 6 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | E 7 | ESE 9 | E 9 | E 10 | E 10 | ESE 9 | ESE 7 | E 7 | E 10 | E 10 | E 10 | E 10 | E 10 | ESE 10 | ESE 9 |
Wave Graph | |||||||||||||||||||||
195 | 297 | 463 | 294 | 208 | 200 | 239 | 826 | 1173 | 2011 | 1527 | 1324 | 468 | 251 | 325 | 327 | 313 | 353 | 377 | 659 | 308 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross | cross-off | cross-off | off | off | off | off | cross-off |
High Tide | 7:32PM2.12m | 7:23AM2.23m | 7:57PM2.14m | 8:01AM2.21m | 8:23PM2.15m | 8:39AM2.14m | 8:50PM2.13m | 9:20AM2.02m | 9:18PM2.09m | 10:05AM1.87m | 9:49PM2.03m | 10:59AM1.71m | 10:24PM1.95m | ||||||||
Low Tide | 1:12PM0.32m | 1:22AM0.69m | 1:44PM0.38m | 1:56AM0.60m | 2:14PM0.48m | 2:31AM0.54m | 2:44PM0.61m | 3:07AM0.52m | 3:14PM0.77m | 3:47AM0.54m | 3:45PM0.94m | 4:34AM0.60m | 4:18PM1.11m | ||||||||
6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | |
— | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | |
mm | 1 | — | — | — | — | — | — | 2 | 9 | 4 | 7 | 10 | 3 | 1 | 1 | 2 | 1 | — | — | — | — |
Temp °C | 28 | 29 | 28 | 29 | 29 | 27 | 29 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 29 | 29 | 27 |
Feels °C | 29 | 30 | 29 | 30 | 31 | 28 | 29 | 27 | 26 | 26 | 30 | 28 | 29 | 30 | 30 | 29 | 29 | 28 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | W 10 | SW 9 | SW 9 | SSW 9 | SSW 9 | S 8 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | S 9 | S 9 | E 7 | E 10 | E 10 | S 10 | SSW 10 | E 10 | ESE 10 | ESE 9 |
239 | 75 | 81 | 133 | 124 | 63 | 177 | 106 | 58 | 77 | 72 | 54 | 276 | 251 | 325 | 327 | 755 | 463 | 377 | 659 | 308 | |
Swell 2 Height (m) Direction Period (s) | SW 9 | W 9 | W 8 | S 6 | S 7 | SW 8 | E 12 | SW 8 | SW 9 | SW 10 | SW 10 | SW 11 | S 11 | S 10 | — | — | E 10 | E 10 | WNW 11 | WNW 8 | WNW 8 |
112 | 80 | 34 | 27 | 25 | 58 | 25 | 45 | 13 | 14 | 14 | 29 | 85 | 386 | — | — | 313 | 353 | 392 | 256 | 238 | |
Swell 3 Height (m) Direction Period (s) | E 12 | S 8 | W 8 | W 8 | E 13 | SSW 10 | ENE 12 | — | — | S 10 | — | NNE 7 | SSW 9 | SW 9 | — | — | WNW 10 | NW 8 | S 9 | S 10 | S 10 |
25 | 10 | 22 | 18 | 53 | 31 | 82 | — | — | 7 | — | 9 | 42 | 13 | — | — | 69 | 35 | 212 | 188 | 151 | |
Wind waves Height (m) Direction Period (s) | SE 6 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | E 7 | ESE 9 | E 9 | E 10 | E 10 | ESE 9 | ESE 7 | S 10 | S 10 | S 10 | — | — | — | — | — |
195 | 297 | 463 | 294 | 208 | 200 | 239 | 826 | 1173 | 2011 | 1527 | 1324 | 468 | 710 | 884 | 1137 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 607 | 820 | 607 | 607 | 839 | 13 | 670 | 670 | 607 | 792 | 820 | 727 | 765 | 785 | 607 | 727 | 792 | 0 | 0 | 0 | 0 |
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.











