
Surf Forecasts:
Yonabaru surf forecast from 14 Sep 2026:
- Most powerful swell: Sunday 20 Sep, 6PM (local time) - 10ft (3.0m), 16s period, E swell with 4,314 kJ wave energy.
Best Forecast Surf Conditions for Yonabaru this week:
The most powerful waves expected at Yonabaru in the next 16 days are 3.0m 16s and forecast to arrive on Sunday (Sep 20) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 8s period and expected on Saturday (Sep 19) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6PM (Sun 20th Sep) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s cookin' for the next couple of weeks at Yonabaru.
Right off the bat, I gotta be honest with you: the first week is a bit of a washout for us. From Monday the 14th right through to Friday the 18th, the surf is small and the wind is mostly onshore or cross-onshore. We’re looking at knee-high waves around 2ft to 3ft, with short period energy (9 seconds) and low combined swell energy (between 114 and 232). It’s a lot of chop and wind ripples, not worth paddling out for.
Things finally start to show some life on Saturday the 19th. A pulse of groundswell arrives from the east with a period of 15 seconds, pushing the swell up to 3ft in the morning and 5ft by the afternoon. The combined energy jumps to 554 then 1197, so we’re talking moderate wave energy. Problem is, the wind swings cross-shore at 12 mph, bringing a cross-chop. The morning session is still marginal, and even the afternoon is only rated as borderline. The water temp is 84°F, which is pretty much average for this time of year, so at least you won’t need a spring suit.
Sunday the 20th sees the swell building even more: 8ft in the morning and 10ft by the afternoon from the east, with a very long 16-second period. Combined energy hits 3166 then 4177 – that’s strong wave energy. But the wind is still cross-shore at 16 mph, creating a lumpy surface. This swell is getting big, and at 8ft to 10ft it's really only for the experienced crew. The conditions are still just marginal.
Now, Monday the 21st is where we get our first real standout. The swell drops a little to 8ft in the morning and 7ft in the afternoon, still from the east with a 14-second period. The wind shifts to cross-offshore from the NNW at 19 mph, and the wave face cleans right up. Combined energy is still strong at 2860 and 2385. This is the best session of the first week – solid, clean groundswell. But be aware, east swell with a long period at a beach break can break a bit straight, so you’ll want to pick your peak.
Tuesday the 22nd is a nice follow-up: 4ft in the morning and 5ft in the afternoon, with clean conditions thanks to a cross-offshore breeze from the northwest at 12 mph. The swell direction swings around to the NNW by afternoon, and the period drops to 10 seconds, so it’s a bit less powerful. Combined energy is moderate at 845 and 699. A solid day for a fun, manageable surf.
After that, from Wednesday the 23rd through Friday the 25th, we hit another flat, choppy stretch. Wave heights drop below 3ft, period shortens, and the wind turns onshore or cross-onshore again. Not much to get excited about.
Then we get a big, heavy pulse rolling in for the weekend of the 26th and 27th of September. The guidance warns that the swell is predicted to be too big for this break. Saturday afternoon sees 12ft from the SE with an 11-second period and combined energy at 2729. Sunday is similar: 12ft from the ESE with an 8-second period and 1745 to 1842 energy. Despite the wind being cross-shore, the score is high purely because of the sheer size, but this is expert-only territory. If you’re not a seasoned charger, give this one a miss. The short period on Sunday will make for a steep, dumpy wave.
After that, the last few days of the month taper off quickly. The swell drops back below 7ft, the period shortens, and the wind stays strong and cross-shore, creating lumpy, choppy conditions. Nothing worth chasing.
So, to wrap it up: your one standout is Monday the 21st of September. The 7ft to 8ft east groundswell with a long 14-second period and clean cross-offshore wind will give you the best, most rideable waves of the whole period. After that, the big 12ft swell on the 26th and 27th is for experts only.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Tue night. Warm (max 29°C on Tue afternoon, min 26°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Thu afternoon. Warm (max 29°C on Fri morning, min 26°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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 9 | ESE 9 | ESE 9 | E 9 | E 9 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 13 | E 9 | E 9 | E 9 | E 15 | E 15 | E 15 | E 16 | E 16 | E 15 |
Wave Graph | ||||||||||||||||||||
158 | 162 | 166 | 176 | 180 | 150 | 144 | 113 | 108 | 108 | 84 | 57 | 54 | 54 | 459 | 1169 | 1877 | 3064 | 4056 | 3326 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross-off |
High Tide | 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 | 3:18PM1.59m | 1:13AM1.68m | |||||||
Low Tide | 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 | 7:25AM0.71m | 7:52PM1.42m | ||||||||
— | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | |
6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | |
mm | — | 2 | 2 | 1 | 2 | 1 | 3 | 1 | 1 | 1 | 3 | — | 1 | — | — | 1 | — | — | — | — |
Temp °C | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 26 | 28 | 28 | 27 | 29 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 26 |
Feels °C | 30 | 30 | 31 | 33 | 31 | 31 | 31 | 29 | 32 | 31 | 30 | 33 | 31 | 30 | 30 | 30 | 28 | 28 | 28 | 25 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | E 9 | E 9 | E 15 | E 15 | E 15 | E 16 | E 16 | E 15 |
158 | 162 | 166 | 176 | 180 | 150 | 144 | 113 | 108 | 108 | 76 | 57 | 54 | 54 | 459 | 1169 | 1877 | 3064 | 4056 | 3326 | |
Swell 2 Height (m) Direction Period (s) | E 13 | E 13 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | N 6 | E 13 | N 7 | N 7 | E 12 | E 12 | ESE 9 | S 8 | S 8 | S 8 | — | — |
54 | 54 | 16 | 12 | 10 | 18 | 29 | 36 | 21 | 84 | 22 | 24 | 45 | 44 | 77 | 11 | 5 | 5 | — | — | |
Swell 3 Height (m) Direction Period (s) | N 5 | NNW 5 | E 12 | SW 8 | E 15 | E 14 | E 14 | E 14 | E 14 | N 6 | E 13 | E 12 | N 7 | S 8 | S 8 | S 8 | — | — | — | — |
4 | 6 | 48 | 3 | 17 | 64 | 59 | 100 | 92 | 18 | 84 | 47 | 15 | 12 | 12 | 11 | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | ENE 3 | — | — | — | — | — | NNE 4 | N 4 | N 4 | N 5 | NNE 5 | N 6 | N 6 |
— | — | — | — | — | — | — | 4 | — | — | — | — | — | 11 | 18 | 28 | 61 | 102 | 121 | 199 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 10 | 10 | 10 | 17 | 17 | 14 | 14 | 14 | 10 | 14 | 10 | 14 | 16 | 14 | 670 | 47 | 607 | 792 | 792 | 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.










