Surf Forecasts:
Yonabaru surf forecast from 25 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 12PM (local time) - 15ft (4.5m), 16s period, ESE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 12PM (local time) - 15ft (4.5m), 16s period, ESE swell with 10,348 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 12PM (local time) - 15ft (4.5m), 16s period with ESE 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 Tuesday (Aug 25) at 12PM. The primary swell is predicted to be 4.5m and 16s period with a secondary swell of 1.6m and 6s. 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 4.5m 16s and forecast to arrive on Tuesday (Aug 25) at 12PM. 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 7s period and expected on Wednesday (Aug 26) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Tue 25th Aug) | 15ft (4.5m) 16s |
| Best Surf | 12PM (Tue 25th Aug) | 15ft (4.5m) 16s |
| Most Powerful | 12PM (Tue 25th Aug) | 15ft (4.5m) 16s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here, let’s talk about what’s cooking around Yonabaru.
First up, that water temp is sitting at 84°, right on the money for this time of year, nothing weird going on there. Now, the forecast kicks off with a heap of energy, but it’s not for us. Tuesday morning the 25th is pumping, but I’m not calling it. The swell is a massive 15 ft from the ESE with a very long 17-second period, and combined energy is a whopping 11066 – that’s proper strong. But for a beginner-friendly, fairly exposed spot like Yonabaru, 15 ft is way too big. The wind is a cross 16 mph, which doesn’t help. You’d need to be a fearless expert even to look at it, and even then, that super long period might make it racey and straight. That Tuesday afternoon is the same story, just a touch less energy at 9963, and still too big.
Wednesday the 26th, the size drops, but the quality plummets. Morning has 7 ft from the NNW with only 10 seconds of period and a strong 28 mph cross-off wind. The energy is moderate at 1013, but the surf conditions are poor. The afternoon is marginally better at 6 ft, but still with strong wind and only a score of 1 out of 10. Not worth your time.
Then from Thursday the 27th right through to Monday the 1st of September, it's a flat spell. Swell heights are tiny, mostly under 5 ft, with short periods and onshore or cross-onshore winds. Combined energy drops right down to two-digit numbers like 71 and 57. It’s pretty much a write-off with poor conditions every session. You’re looking at a solid gap of about 6 days with nothing to get excited about.
The first real glimmer shows up on Wednesday morning the 2nd of September. Swell is 5 ft from the E with an 11-second period, combined energy is moderate at 442, and we finally get some clean air – an offshore wind from the WNW at 12 mph. The forecast says “expect good surf conditions.” This is the best option by far in the first week. It’s small but clean, with that offshore wind tidying things up nicely. That afternoon holds some smaller waves at 4 ft but still offshore.
Thursday the 3rd is offshore again with 4 ft waves from the N, but the period drops to 8 seconds and the quality falls back to “poor surf conditions.” Friday the 4th is tiny, under 3 ft.
After another flat patch, we start looking toward the 8th and 9th of September. Tuesday the 8th is looking promising with 7 ft swell from the ESE at 8 seconds, a light 9 mph cross-off breeze from the NNW, and combined energy at a solid moderate 568. It says “expect good surf conditions.” It’s not huge, but the conditions are clean.
But the standout, the one to circle on your calendar, is Wednesday morning the 9th of September. We’ve got a 8 ft swell from the ESE with a 9-second period, combined energy of 959 – that’s strong. And the wind? A light 6 mph cross-off from the NNW. The forecast even says “expect very good surf conditions.” That’s the one. The swell direction is coming from the ESE, which is a little off the optimum NE for Yonabaru, but with that clean wind and solid size, it’s going to be the pick of the whole 16-day window. That afternoon gets bigger, 10 ft from the E with 10-second period and energy up to 1677, but it’s marginal for the break and likely too big for all but the most experienced crew.
So to wrap it up: the first week is mostly a washout, but hold out for Wednesday the 9th of September. That morning session at Yonabaru is where you want to be. Clean, decent size, and good energy.
Rusty.
Short Range ForecastHeavy rain (total 39mm), heaviest during Tue afternoon. Warm (max 30°C on Tue morning, min 27°C on Tue night). Winds decreasing (near gales from the W on Tue night, light winds from the SE by Thu afternoon). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sat morning. Warm (max 29°C on Fri morning, min 27°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | ESE 17 | E 16 | E 12 | NNW 10 | NW 10 | E 13 | E 13 | E 13 | SE 5 | SE 7 | SE 7 | SE 8 | SE 7 | ESE 7 | ESE 7 | ESE 7 | SE 9 | SE 8 | SE 8 | ESE 8 | ESE 8 |
Wave Graph | |||||||||||||||||||||
11066 | 9594 | 1074 | 890 | 589 | 55 | 53 | 51 | 94 | 516 | 365 | 580 | 327 | 209 | 125 | 183 | 371 | 330 | 255 | 237 | 218 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | off | cross-off | cross-off | cross-off | cross | cross-off | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on |
High Tide | 6:10PM1.92m | 5:17AM2.04m | 6:38PM2.01m | 6:03AM2.14m | 7:05PM2.07m | 6:44AM2.21m | 7:32PM2.12m | 7:23AM2.23m | 7:57PM2.14m | 8:01AM2.21m | 8:23PM2.15m | 8:39AM2.14m | 8:50PM2.13m | ||||||||
Low Tide | 11:22AM0.42m | 11:37PM1.12m | 12:03PM0.34m | 00:15AM0.96m | 12:39PM0.31m | 00:49AM0.82m | 1:12PM0.32m | 1:22AM0.69m | 1:44PM0.38m | 1:56AM0.60m | 2:14PM0.48m | 2:31AM0.54m | 2:44PM0.61m | ||||||||
6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | |
— | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | |
mm | 1 | 8 | 10 | 5 | 2 | 6 | 1 | 2 | 4 | — | — | — | 2 | 1 | — | — | — | — | — | — | 3 |
Temp °C | 30 | 29 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 29 | 29 | 27 | 29 | 29 | 28 |
Feels °C | 31 | 28 | 25 | 26 | 28 | 29 | 30 | 30 | 29 | 30 | 30 | 29 | 28 | 30 | 29 | 30 | 30 | 28 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | ESE 17 | E 16 | E 12 | NNW 10 | NW 10 | WNW 10 | W 11 | W 12 | W 12 | W 11 | SSW 9 | SW 10 | SSW 9 | SSW 9 | S 9 | SSW 9 | SSW 9 | SSW 8 | SSW 10 | SSW 9 | SSW 10 |
11066 | 9594 | 1074 | 890 | 589 | 992 | 1018 | 1164 | 872 | 345 | 154 | 139 | 154 | 136 | 103 | 113 | 92 | 26 | 31 | 27 | 33 | |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 9 | NE 10 | ESE 10 | ESE 9 | ESE 8 | ESE 7 | E 13 | SW 8 | SSW 9 | W 10 | W 10 | E 13 | S 8 | SW 10 | E 12 | E 12 | SW 10 | SW 10 | SW 10 | SW 10 |
39 | 27 | 310 | 106 | 66 | 38 | 18 | 51 | 105 | 141 | 138 | 49 | 55 | 58 | 74 | 44 | 44 | 33 | 25 | 25 | 16 | |
Swell 3 Height (m) Direction Period (s) | — | — | N 9 | E 15 | E 14 | E 13 | E 13 | E 18 | E 12 | E 12 | E 15 | E 13 | W 8 | E 13 | E 12 | SSE 12 | SW 9 | E 11 | E 11 | E 11 | E 11 |
— | — | 225 | 17 | 35 | 55 | 53 | 6 | 26 | 25 | 38 | 90 | 5 | 53 | 47 | 13 | 13 | 22 | 21 | 21 | 20 | |
Wind waves Height (m) Direction Period (s) | — | N 6 | WNW 7 | WSW 8 | SW 7 | SSW 7 | SSW 8 | S 8 | SE 5 | SE 7 | SE 7 | SE 8 | SE 7 | ESE 7 | ESE 7 | ESE 7 | SE 9 | SE 8 | SE 8 | ESE 8 | ESE 8 |
— | 369 | 889 | 1112 | 641 | 346 | 460 | 338 | 94 | 516 | 365 | 580 | 327 | 209 | 125 | 183 | 371 | 330 | 255 | 237 | 218 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 622 | 599 | 607 | 607 | 607 | 607 | 607 | 607 | 599 | 599 | 607 | 703 | 703 | 1013 | 670 | 13 | 16 | 680 | 670 | 1506 | 607 |
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.











