Surf Forecasts:
Yonabaru surf forecast from 11 Sep 2026:
- Most powerful swell: Friday 18 Sep, 3PM (local time) - 3ft (0.9m), 18s period, ESE swell with 454 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 18s and forecast to arrive on Friday (Sep 18) 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 0.2m 6s period and expected on Sunday (Sep 13) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Fri 18th Sep) | 3ft (0.9m) 18s |
Table - best surf conditions forecast for Yonabaru over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what’s coming down the pike in the next couple weeks.
I’ll be honest, it starts off rough. We’ve got a long stretch of flatness. From September 11th all the way through the 24th, it’s pretty much a bust. Every session is marked as poor surf conditions. We got tiny waves – under 3 ft – with wind mostly onshore or cross-onshore. That’s a solid 14-day gap of nothin’ worth paddlin’ out for. This kind of dry spell is pretty standard for the area when the trades are pinned, so don’t sweat it too much.
The first real chance we get is on September 25th. Friday morning at Yonabaru finally lights up. We’re looking at a clean 4 ft swell from the ESE with a very long 16-second period – that’s proper groundswell. The wind is light and cross-offshore, so the surface should be glassy. Combined swell energy is a healthy 826 – that’s moderate but solid. That long period means the waves will have some real punch and line up nicely. This is the standout of the whole forecast.
The afternoon of the 25th bumps up to 5 ft with the same long period, but the wind turns cross-shore, so it won’t be as clean. Still worth a look, but the morning is the winner.
Saturday the 26th holds some size too – 6 ft to 7 ft from the ESE, still with that 16-second period. Strong energy numbers, 1575 and 1930. But again, the wind is cross-onshore, which’ll put some texture on the face. It’s surfable, just not as crisp as Friday morning.
So mark your calendar for that Friday, September 25th morning. Clean, solid, long-period groundswell. Water’s about 84°F, which is dead average for this time of year.
Rusty, out.
Short Range ForecastModerate rain (total 12mm), heaviest on Sun afternoon. Warm (max 29°C on Fri morning, min 27°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 15mm), heaviest on Mon afternoon. Warm (max 28°C on Tue morning, min 25°C on Mon afternoon). Wind will be generally light. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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) | NNW 8 | NNW 8 | SE 6 | E 14 | E 14 | E 14 | E 6 | E 6 | ESE 8 | ESE 8 | E 8 | ESE 9 | E 9 | E 9 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 13 | E 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 94 | 67 | 52 | 61 | 64 | 62 | 61 | 128 | 151 | 163 | 177 | 166 | 162 | 162 | 173 | 149 | 138 | 110 | 108 | 84 | 84 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | on | on | cross-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 | 12:42PM0.38m | 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 | — | — | 6:11 | — | — | 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 | 2 | 2 | — | — | — | — | 4 | 2 | 2 | 6 | 4 | — | 2 | — | — | 1 | — | — | 1 | — |
Temp °C | 29 | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 26 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 27 |
Feels °C | 32 | 32 | 32 | 31 | 31 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 31 | 31 | 30 | 31 | 31 | 31 | 33 | 33 | 30 |
Swell 1 Height (m) Direction Period (s) | NNW 8 | NNW 8 | N 8 | SE 6 | N 7 | NNW 6 | E 14 | E 14 | E 13 | ESE 8 | E 8 | ESE 9 | E 9 | E 9 | E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | E 9 |
| kJ | 94 | 67 | 41 | 39 | 24 | 13 | 61 | 62 | 56 | 163 | 177 | 166 | 162 | 162 | 173 | 149 | 138 | 110 | 108 | 84 | 73 |
Swell 2 Height (m) Direction Period (s) | ESE 8 | ESE 8 | E 15 | N 7 | E 14 | E 14 | ESE 9 | S 6 | N 5 | E 13 | E 13 | E 13 | E 13 | E 12 | NNW 6 | E 14 | E 14 | E 14 | E 14 | E 13 | E 13 |
| kJ | 62 | 50 | 38 | 25 | 64 | 62 | 16 | 3 | 9 | 55 | 54 | 54 | 51 | 47 | 4 | 61 | 58 | 100 | 91 | 84 | 84 |
Swell 3 Height (m) Direction Period (s) | S 7 | S 7 | WNW 6 | E 14 | S 6 | S 7 | N 6 | SW 8 | S 6 | N 5 | SW 8 | N 4 | SSW 8 | SSW 8 | NNW 4 | NNW 5 | NW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 |
| kJ | 9 | 8 | 4 | 61 | 7 | 8 | 7 | 3 | 3 | 5 | 3 | 3 | 7 | 7 | 1 | 5 | 10 | 16 | 15 | 16 | 14 |
Wind waves Height (m) Direction Period (s) | SE 4 | — | SE 6 | — | SE 6 | ESE 5 | E 6 | E 6 | ESE 8 | — | N 5 | — | — | — | — | — | — | — | — | — | ESE 4 |
| kJ | 6 | — | 52 | — | 32 | 35 | 61 | 128 | 151 | — | 2 | — | — | — | — | — | — | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 10 | 10 | 10 | 14 | 14 | 14 | 14 | 14 | 607 | 607 | 14 | 10 | 10 | 17 | 17 | 10 | 10 | 10 | 10 | 14 | 10 |
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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