Surf Forecasts:
Yonabaru surf forecast from 13 Sep 2026:
- Most powerful swell: Sunday 20 Sep, 3AM (local time) - 8ft (2.5m), 16s period, E swell with 3,001 kJ wave energy.
Best Forecast Surf Conditions for Yonabaru this week:
The most powerful waves expected at Yonabaru in the next 16 days are 2.5m 16s and forecast to arrive on Sunday (Sep 20) at 3AM. Winds are predicted to be cross-shore 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 | 3AM (Sun 20th Sep) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here again, giving you the lowdown in feet and miles per hour.
Honestly, it’s a tough stretch for Yonabaru. We’re looking at over a week of poor conditions before anything really shows up. The water temp is about 84°F, which is pretty normal for this time of year, nothing unusual.
The first real chance to get wet is the morning of Monday, September 21st. We’ve got a 4ft swell from the ENE with a 12-second period, and the wind is a light cross-offshore breeze, so it’ll be clean. The combined swell energy is strong – reading 901 – so there’s some punch behind it. This spot is for beginners, fairly exposed, and the optimum swell direction is NE, which we’re close to. Crowds can show up sometimes, so if you can get out early, that’s your best bet.
That Monday afternoon, though, forget it. The wind cranks up to a near gale from the south at 37 mph and the swell turns into a messy 6ft from NNW with a short period. Tuesday the 22nd is even worse with gale-force winds, so stay on land.
After that, the rest of the week goes quiet again – small waves and onshore winds. Even when the wind turns offshore later on, the swell is tiny and weak. The weekend of the 27th-28th sees a bit of a bump – around 5ft from the ESE with a 12-second period and moderate to strong energy (600-700), but the wind is cross or cross-off, so it won’t be perfect. Still, it might be the next best thing after that Monday the 21st session.
So the clear standout is the morning of Monday the 21st. Clean, solid 4ft, long period, light winds. After a week of nothing, that’s your window. The weekend after that might offer something, but it’s not as clean. Keep an eye on it.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Tue afternoon. Warm (max 29°C on Sun morning, min 27°C on Sun afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Wed morning. Warm (max 29°C on Wed afternoon, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 14 | E 6 | ESE 8 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 13 | ESE 9 | ESE 8 | E 8 | E 16 | E 16 | E 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 61 | 98 | 151 | 144 | 158 | 158 | 169 | 173 | 176 | 150 | 147 | 113 | 108 | 106 | 84 | 80 | 75 | 143 | 667 | 1189 | 2609 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | on | on | cross-on | on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross |
High Tide | 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 | 11:28AM1.62m | 10:24PM1.88m | 1:11PM1.54m | 11:24PM1.76m | ||||||||
Low Tide | 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 | 4:45AM0.57m | 4:23PM1.23m | 5:52AM0.66m | 5:28PM1.37m | ||||||||
 |  |  | | |  |  | | | | | | | | | | | | | |  | |
 | 6:13 | — | — | 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 | — | 1 | 2 | 1 | — | — | — | 2 | 1 | 3 | 1 | 1 | — | 1 | — | — | 3 | — | — | — | — |
Temp °C | 29 | 29 | 27 | 27 | 28 | 27 | 29 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 29 | 28 | 27 | 29 | 28 | 27 |
Feels °C | 31 | 31 | 30 | 28 | 29 | 29 | 32 | 31 | 30 | 31 | 32 | 30 | 32 | 32 | 30 | 32 | 31 | 30 | 30 | 29 | 26 |
Swell 1 Height (m) Direction Period (s) | E 14 | E 14 | E 13 | ESE 8 | ESE 9 | ESE 9 | ESE 9 | E 9 | E 9 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | E 8 | E 16 | E 16 | E 16 |
| kJ | 61 | 62 | 56 | 144 | 158 | 158 | 169 | 173 | 176 | 150 | 147 | 113 | 108 | 106 | 79 | 80 | 75 | 88 | 667 | 1189 | 2609 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | S 6 | N 5 | E 13 | E 13 | E 13 | E 12 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 6 | E 13 | E 13 | E 12 | E 12 | N 7 | E 8 | E 8 | S 8 |
| kJ | 16 | 3 | 8 | 55 | 54 | 54 | 48 | 12 | 14 | 27 | 47 | 26 | 23 | 84 | 84 | 47 | 45 | 15 | 86 | 64 | 5 |
Swell 3 Height (m) Direction Period (s) | NNW 6 | NNW 6 | S 6 | N 5 | N 5 | N 5 | NNW 6 | E 12 | E 15 | E 14 | E 14 | E 14 | E 14 | NNW 6 | NNW 7 | N 7 | N 7 | E 12 | S 8 | S 8 | — |
| kJ | 7 | 3 | 3 | 5 | 2 | 2 | 8 | 12 | 17 | 64 | 59 | 100 | 91 | 12 | 15 | 14 | 15 | 44 | 11 | 10 | — |
Wind waves Height (m) Direction Period (s) | ESE 6 | E 6 | ESE 8 | — | — | — | — | — | — | — | — | E 3 | — | — | — | — | — | E 8 | NNE 4 | N 4 | N 6 |
| kJ | 40 | 98 | 151 | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 143 | 15 | 30 | 100 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 14 | 599 | 76 | 10 | 10 | 10 | 17 | 17 | 10 | 14 | 10 | 10 | 14 | 10 | 670 | 670 | 670 | 47 | 836 | 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.
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