Surf Forecasts:
Yonabaru surf forecast from 13 Sep 2026:
- Most powerful swell: Sunday 20 Sep, 12PM (local time) - 8ft (2.4m), 15s period, E swell with 2,424 kJ wave energy.
Best Forecast Surf Conditions for Yonabaru this week:
The most powerful waves expected at Yonabaru in the next 16 days are 2.4m 15s and forecast to arrive on Sunday (Sep 20) 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 1.4m 6s period and expected on Sunday (Sep 20) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12PM (Sun 20th Sep) | 8ft (2.4m) 15s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, let's get this out there. The next week and a half is pretty grim, so I'll be upfront with you.
We’ve got Yonabaru checking in as a fairly consistent spot, but honest to god, the first week is a write-off. From September 14th through the 17th, we’re looking at dribbly, 3ft to 3ft ESE slop with on and cross-on winds. The energy is weak, with readings in the mid-200s or less. It’s not doing anything. Then from the 18th, it drops off even more. There’s a real gap here where you’re just not going to want to paddle out. The combined energy numbers are down in the 100s. It's a flat, frustrating run to start.
Things start to change on Saturday the 19th. There’s a pulse of energy coming in from the east, with a proper 16-second period. The swell builds to 5ft in the morning and 6ft by the afternoon, and the energy jumps to 1095, then 1692. That’s a big kick of groundswell, but it’s still not clean. The wind is cross and howling at 12-16 mph, which is putting a chop on the surface. With that strong east swell and poor quality, this beach setup could be more interesting for a kite surfer than a paddle surfer to be honest.
Sunday the 20th is the standout of this whole period, and the only window that looks truly worth it. The swell is up to 8ft in the morning with a 15-second period, and the energy is surging to 2366. More importantly, by the afternoon the wind swings to the NNW at 19 mph, which gives us a cross-off wind. It gets a "clean" label, which is the first time we've seen that. That is going to be big, powerful and a real test. This is well over the 8ft mark for the experts only. This east-northeast swell is a bit off from its optimum direction of NE, but the size and period should make up for it. This will be a serious, heavy day.
That big pulse fades through Monday the 21st and Tuesday the 22nd, with the swell dropping back down to the 5ft to 6ft range. Winds stay cross-off, which keeps it clean, but the period drops away quickly. The energy is still in the four figures, so it will be strong but becoming less organized. There’s still options here, but it won’t have the same punch as Sunday.
After that, it fades into the distance. From Wednesday the 23rd onwards, we’re back to smaller, shorter-period waves with onshore winds. The energy backs off into the low hundreds and then just dies out completely by Friday the 25th. After that, a stubborn NE wind sets in and it's over.
And a note on the water: it’s just about average for mid-September right now, nothing weird to worry about.
Signing off.
Rusty
Short Range ForecastModerate rain (total 11mm), heaviest on Sun night. Warm (max 28°C on Mon afternoon, min 26°C on Mon morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Fri afternoon. Warm (max 29°C on Thu morning, min 26°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 8 | ESE 8 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 13 | E 9 | E 12 | ESE 19 | E 16 | E 16 | E 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 151 | 147 | 158 | 162 | 158 | 180 | 176 | 150 | 144 | 138 | 108 | 106 | 84 | 73 | 52 | 122 | 1029 | 1692 | 2203 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | on | on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross | cross-on | cross | cross | cross |
High Tide | 8:13AM2.16m | 8:15PM2.15m | 8:52AM2.06m | 8:43PM2.13m | 9:34AM1.93m | 9:11PM2.07m | 10:23AM1.77m | 9:44PM1.99m | 11:28AM1.62m | 10:24PM1.88m | 1:11PM1.54m | 11:24PM1.76m | |||||||
Low Tide | 2:00AM0.44m | 2:14PM0.62m | 2:35AM0.41m | 2:43PM0.76m | 3:12AM0.42m | 3:13PM0.91m | 3:55AM0.48m | 3:45PM1.07m | 4:45AM0.57m | 4:23PM1.23m | 5:52AM0.66m | 5:28PM1.37m | |||||||
 |  | |  |  |  |  |  | | | | | | | | | | | | |
 | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — |
 | 6:36 | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:29 | — |
mm | 4 | — | — | 2 | 3 | — | — | 1 | 1 | 2 | 2 | — | — | 1 | 2 | — | — | — | — |
Temp °C | 27 | 27 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 27 |
Feels °C | 30 | 29 | 29 | 30 | 31 | 31 | 30 | 31 | 31 | 30 | 32 | 31 | 30 | 31 | 31 | 30 | 31 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | E 13 | ESE 8 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | E 8 | E 8 | E 16 | E 16 | E 16 |
| kJ | 56 | 147 | 158 | 162 | 158 | 180 | 176 | 150 | 144 | 138 | 108 | 106 | 76 | 73 | 52 | 52 | 1029 | 1692 | 2203 |
Swell 2 Height (m) Direction Period (s) | N 5 | E 13 | E 13 | E 13 | E 12 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | E 13 | N 7 | N 7 | E 12 | ESE 19 | S 8 | S 8 | S 8 |
| kJ | 9 | 55 | 54 | 54 | 48 | 14 | 20 | 28 | 47 | 32 | 25 | 84 | 24 | 23 | 45 | 122 | 12 | 12 | 5 |
Swell 3 Height (m) Direction Period (s) | S 6 | N 5 | N 5 | NNW 6 | NNW 6 | SW 8 | E 15 | E 14 | E 14 | E 14 | E 14 | NNW 6 | E 13 | E 12 | N 7 | E 12 | ESE 10 | S 8 | — |
| kJ | 3 | 4 | 4 | 6 | 8 | 3 | 17 | 64 | 58 | 100 | 91 | 15 | 84 | 47 | 15 | 44 | 33 | 12 | — |
Wind waves Height (m) Direction Period (s) | ESE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNE 4 | N 8 | N 4 | N 5 |
| kJ | 151 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 11 | 33 | 27 | 74 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 51 | 51 | 10 | 10 | 17 | 17 | 17 | 14 | 14 | 10 | 10 | 14 | 14 | 14 | 14 | 47 | 607 | 670 | 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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