Surf Forecasts:
Yonabaru surf forecast from 11 Sep 2026:
- Most powerful swell: Friday 18 Sep, 9PM (local time) - 3ft (0.9m), 16s period, ESE swell with 371 kJ wave energy.
Best Forecast Surf Conditions for Yonabaru this week:
The most powerful waves expected at Yonabaru in the next 16 days are 0.9m 16s and forecast to arrive on Friday (Sep 18) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 7s period and expected on Saturday (Sep 12) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9PM (Fri 18th Sep) | 3ft (0.9m) 16s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here again, giving you the waves in feet and miles per hour. It’s a long, dry spell ahead, so let’s be straight about it.
We’re looking at a massive blank run. From Friday the 11th all the way through to the morning of Thursday the 24th, every call is "poor surf conditions." That’s nearly 13 days where the surf is just a no-go. The swell is tiny, weak, and the wind is mostly blowing onshore or cross-onshore. The combined wave energy is mostly in the triple digits (weak to moderate), which just doesn’t cut it.
The One and Only Window
The first flicker of proper surf is on Thursday the 24th of September. This is your standout. A long-period groundswell from the ESE at 5ft, with a 17-second period (good, clean energy), and a light NW offshore wind. That’s clean. The combined energy jumps to 1314 (moderate). Thursday afternoon holds with the swell bumping to nearly 6ft (energy at 1975) and the wind still clean. For a spot like Yonabaru, which is a fairly exposed beginner-friendly set-up, this is prime.
But don’t get too comfortable. Friday the 25th shows a big 8ft ESE swell (strong energy at 5241), but the wind turns cross-onshore, chopping it up. It’s marginal.
Then it gets heavy. Saturday the 26th delivers a monster 11-12ft NW swell, with energy readings over 3000 (very strong). That’s expert-only territory and probably too much water moving around for this break to handle nicely. The wind is light cross-shore, but size is the defining factor.
Crowds & Water: Yonabaru can see crowds *sometimes*, so that Thursday the 24th clean window will likely have company. The water is a warm 83°, which is normal for the season.
The Verdict: Write off the first 13 days completely. Thursday the 24th of September is your only real shot at a clean, surfable wave. The rest is too big, too choppy, or getting hammered by gale-force winds. It’s a long haul for one good day.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Sun afternoon. Warm (max 29°C on Fri afternoon, min 27°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Wed morning. Warm (max 28°C on Tue morning, min 26°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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) | NNW 8 | SE 6 | E 14 | E 14 | E 14 | E 14 | E 6 | E 8 | ESE 8 | ESE 8 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | E 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 67 | 42 | 61 | 64 | 62 | 61 | 94 | 235 | 140 | 151 | 215 | 197 | 169 | 149 | 149 | 138 | 110 | 106 | 101 | 84 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | cross-on | cross-on | on | on | on | on | cross-on | on | on | on | on | on | on | on | on |
High Tide | 6:58PM2.10m | 6:58AM2.21m | 7:23PM2.14m | 7:35AM2.21m | 7:49PM2.16m | 8:13AM2.16m | 8:15PM2.15m | 8:52AM2.06m | 8:43PM2.13m | 9:34AM1.93m | 9:11PM2.07m | 10:23AM1.77m | 9:44PM1.99m | |||||||
Low Tide | 00:54AM0.63m | 1:14PM0.43m | 1:27AM0.51m | 1:44PM0.51m | 2:00AM0.44m | 2:14PM0.62m | 2:35AM0.41m | 2:43PM0.76m | 3:12AM0.42m | 3:13PM0.91m | 3:55AM0.48m | 3:45PM1.07m | ||||||||
 |  |  |  |  | | | | | | | | |  | | | | | | | |
 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — |
 | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — |
mm | 2 | 1 | — | — | — | — | 2 | 4 | 2 | 2 | 1 | 1 | — | 1 | 4 | — | — | 2 | — | 1 |
Temp °C | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 32 | 32 | 31 | 31 | 30 | 30 | 29 | 30 | 29 | 30 | 30 | 31 | 30 | 30 | 31 | 32 | 31 | 31 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | NNW 8 | N 8 | SE 6 | N 7 | NNW 6 | E 14 | E 14 | E 8 | ESE 8 | ESE 8 | E 13 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 |
| kJ | 67 | 41 | 39 | 24 | 13 | 61 | 62 | 142 | 140 | 151 | 54 | 197 | 169 | 149 | 149 | 138 | 110 | 106 | 101 | 54 |
Swell 2 Height (m) Direction Period (s) | ESE 7 | E 15 | N 7 | E 14 | E 14 | ESE 9 | S 6 | N 5 | E 13 | E 13 | — | E 13 | E 12 | E 12 | E 14 | E 14 | E 14 | E 14 | E 13 | E 13 |
| kJ | 48 | 38 | 25 | 64 | 62 | 16 | 3 | 12 | 55 | 54 | — | 50 | 47 | 47 | 95 | 57 | 100 | 91 | 84 | 84 |
Swell 3 Height (m) Direction Period (s) | S 7 | WNW 6 | E 14 | S 6 | S 7 | N 6 | NW 6 | E 13 | N 5 | N 5 | SW 8 | SW 8 | SW 8 | NNW 5 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 |
| kJ | 8 | 4 | 61 | 7 | 14 | 7 | 1 | 56 | 4 | 2 | 2 | 2 | 3 | 3 | 4 | 8 | 12 | 12 | 11 | 6 |
Wind waves Height (m) Direction Period (s) | — | SE 6 | — | ESE 6 | E 5 | E 6 | E 6 | E 8 | — | — | E 9 | — | — | — | — | — | ENE 3 | — | — | E 3 |
| kJ | — | 42 | — | 28 | 27 | 49 | 94 | 235 | — | — | 215 | — | — | — | — | — | 3 | — | — | 2 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 10 | 10 | 26 | 14 | 14 | 14 | 14 | 14 | 17 | 10 | 10 | 17 | 17 | 10 | 10 | 10 | 10 | 10 | 10 | 14 |
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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