Surf Forecasts:
Yonabaru surf forecast from 17 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 3PM (local time) - 10ft (3.0m), 10s period, SE swell with 1,531 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 10s and forecast to arrive on Thursday (Aug 20) at 3PM. 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 8s period and expected on Sunday (Aug 23) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Thu 20th Aug) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about Yonabaru and the next couple weeks. The first ten days or so are gonna leave you feeling a bit blue. It's a real test of patience.
Starting off Monday the 17th, we’re looking at tiny, weak, onshore slop. Wave energy is barely a ripple at 93. The water temp is a normal 84°, nothing to write home about. Tuesday the 18th has a touch more swell, but it’s short-period, wind-blown junk with an onshore wind at 15 mph. Whole first week is plagued by onshore winds and storm threats, keeping everything choppy and a mess. Swell builds through the 20th and 21st, getting up to about 10 ft, but it's all lumpy cross-onshore chop. You get a lot of wave energy—into the thousands—but it's all just ugly, powerful mush.
It gets quiet again from the 23rd into early the next week, but that's just because the swell vanishes. Knee-high dribble.
Now, here's where it gets interesting. After a long, flat spell, Wednesday the 26th of August shows real potential. We get a clean-looking cross-shore wind from the NNE at a light 6 mph. Swell jumps to about 8 ft from the ESE, but here's the kicker—that swell period is a massive 16 seconds. That’s a true groundswell, full of punch (energy at 2961). For Yonabaru, that long period can make the wave break a bit straight, but with such clean wind, it’s going to be a powerful, glassy session. At 8 ft, it's starting to get big for the casual surfer.
From Thursday the 27th through the end of the month, the picture gets good. We get cross-offshore winds—clean conditions. The swell holds around 6 to 10 ft, still from the ESE with those long power periods. The standout, the one day to really keep a bead on, is Sunday the 30th of August. Light offshore wind from the WNW at 9 mph, a solid 10 ft ESE groundswell at 16 seconds. Wave energy is roaring at 4030, and the call is "excellent for experienced surfers." This is proper, heavy, clean surf. Way too big for beginners, but for the crew that can handle it, this is the session.
Monday the 31st is more of the same big, clean waves, but by afternoon, the swell is forecast to be too big for the break. Tuesday the 1st of September still has the big swell, but the wind swings onshore and it gets messy again.
Bottom line: you’ve got a real dry spell to start. Don't bother. The real gold is at the end of August, with Sunday the 30th being the absolute best bet. Mark it down for some big, clean, powerful waves.
- Rusty
Short Range ForecastHeavy rain (total 25mm), heaviest during Wed night. Warm (max 29°C on Mon morning, min 27°C on Mon night). Winds increasing (light winds from the ESE on Mon morning, strong winds from the ESE by Wed night). | Days 4-6 Weather SummaryHeavy rain (total 44mm), heaviest during Thu night. Warm (max 30°C on Sat morning, min 26°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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) | E 10 | E 10 | E 10 | E 6 | E 6 | E 7 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 10 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | ENE 9 | E 14 | ENE 8 | E 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 73 | 71 | 48 | 94 | 112 | 271 | 469 | 356 | 751 | 1202 | 1531 | 1019 | 742 | 953 | 594 | 748 | 532 | 15 | 15 | 22 | 14 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:07AM2.08m | 9:27PM2.09m | 9:50AM1.95m | 9:57PM2.05m | 10:40AM1.79m | 10:31PM1.99m | 11:45AM1.63m | 11:12PM1.91m | 1:25PM1.53m | 00:10AM1.84m | 3:38PM1.57m | 1:38AM1.79m | 4:55PM1.69m | ||||||||
Low Tide | 3:16PM0.62m | 3:42AM0.63m | 3:47PM0.79m | 4:26AM0.65m | 4:20PM0.97m | 5:20AM0.70m | 4:58PM1.15m | 6:30AM0.74m | 5:55PM1.32m | 8:02AM0.73m | 7:49PM1.42m | 9:29AM0.65m | 9:46PM1.39m | ||||||||
 | |  | | |  |  | | | | | | | |  | | | | | | | |
 | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | — | 1 | — | — | 4 | 5 | 3 | 12 | 3 | 5 | 15 | 7 | 4 | — | 3 | 3 | 4 | — | — | — |
Temp °C | 29 | 29 | 27 | 28 | 29 | 28 | 28 | 27 | 28 | 28 | 28 | 27 | 27 | 28 | 27 | 30 | 29 | 27 | 28 | 29 | 27 |
Feels °C | 32 | 31 | 30 | 29 | 30 | 30 | 29 | 28 | 28 | 31 | 29 | 29 | 30 | 30 | 30 | 33 | 31 | 31 | 30 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 10 | S 8 | SW 9 | SW 9 | SW 9 | SW 10 | SW 10 | SW 10 |
| kJ | 74 | 74 | 77 | 35 | 34 | 34 | 18 | 11 | 11 | 14 | 12 | 12 | 14 | 23 | 210 | 64 | 141 | 119 | 106 | 79 | 38 |
Swell 2 Height (m) Direction Period (s) | E 10 | E 10 | E 10 | S 7 | S 7 | S 7 | S 8 | S 8 | SW 8 | SW 9 | SSW 8 | — | — | E 11 | SW 10 | ENE 9 | SW 10 | SSW 9 | ENE 8 | ENE 8 | E 13 |
| kJ | 73 | 71 | 48 | 9 | 8 | 4 | 5 | 11 | 11 | 13 | 13 | — | — | 59 | 32 | 8 | 90 | 67 | 14 | 22 | 14 |
Swell 3 Height (m) Direction Period (s) | S 7 | S 7 | S 7 | SE 10 | SSE 10 | SE 10 | S 8 | SSW 8 | S 11 | — | — | — | — | — | E 14 | ENE 9 | E 10 | ENE 9 | E 14 | E 14 | E 10 |
| kJ | 16 | 9 | 9 | 16 | 10 | 4 | 1 | 6 | 10 | — | — | — | — | — | 4 | 8 | 44 | 15 | 15 | 15 | 8 |
Wind waves Height (m) Direction Period (s) | SE 5 | ESE 5 | ESE 5 | E 6 | E 6 | E 7 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 10 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 7 | SSE 8 | SSE 8 | SSE 8 |
| kJ | 20 | 16 | 36 | 94 | 112 | 271 | 469 | 356 | 751 | 1202 | 1531 | 1019 | 742 | 953 | 594 | 748 | 532 | 554 | 709 | 579 | 574 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 10 | 10 | 13 | 13 | 16 | 616 | 853 | 607 | 599 | 599 | 616 | 616 | 13 | 616 | 13 | 13 | 607 | 599 | 599 | 616 | 13 |
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.
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