Surf Forecasts:
Aoshima surf forecast from 16 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9AM (local time) - 4.5ft (1.3m), 9s period, S swell with offshore winds.
- Most powerful swell: Thursday 20 Aug, 9PM (local time) - 5ft (1.6m), 11s period, SSE swell with 586 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 6AM (local time) - 3.5ft (1.0m), 10s period with E swell.
Best Forecast Surf Conditions for Aoshima this week:
The surf forecast for Aoshima over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 6AM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.4m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Aoshima in the next 16 days are 1.6m 11s and forecast to arrive on Thursday (Aug 20) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Sunday (Aug 23) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 17th Aug) | 3.5ft (1.0m) 10s |
| Best Surf | 9AM (Sat 22nd Aug) | 4.5ft (1.3m) 9s |
| Most Powerful | 9PM (Thu 20th Aug) | 5ft (1.6m) 11s |
Table - best surf conditions forecast for Aoshima over the next 16 days.
The Lowdown
Hey, Rusty here again, same spot, different numbers for you fellas.
We’re looking at a patchy start at Aoshima, but the backend of this run is a real doozy. The first real chance for a surf is Monday the 17th of August.
Monday morning the 17th, it’s clean and small. Wave height is 4ft from the East, 10-second interval. The wind is glassy, and combined wave energy is a moderate 278. It ain’t a monster, but it’ll be fun on the reef. Crowds will be around on a morning this clean.
Tuesday and Wednesday the 18th and 19th are a washout with dirty onshore breeze and sloppy waves. Skip it.
Thursday the 20th gets some push with a 5ft SSE swell in the afternoon and a strong energy reading of 612, but it’s crossed up and stormy.
Friday the 21st cleans up. Morning brings a 5ft SSE swell with cross-offshore wind. Surfaces are clean. Not a standout, but a solid option.
The party really starts Saturday the 22nd. A glassy morning, 4ft from the South, light offshore wind, and 507 energy. That’s your weekend winner. Sunday the 23rd holds another clean morning at 4ft from the SSW, but the afternoon dies out.
Monday the 24th afternoon is another beauty. Glassy conditions, 4ft of ESE groundswell with a very long 16-second period. Energy hits a strong 957. The water temp feels about average for this time of year.
Tuesday the 25th morning is the real prize. Glassy flat water, 6ft ESE groundswell at 16 seconds. Combined energy is a powerful 1863. This is expert territory. The reef will shape those long-period swells into lined-up gems. Paddling out will be easier between the long waits, but the waves will be solid.
From the 26th onward the swell stays big but the wind fouls up. Wednesday through Thursday get up to 12ft with onshore wind and energy over 6000. Messy. By the 28th it’s lumpy and windy, but then Saturday the 29th of August is the big one. Clear skies, light offshore breeze, and a massive 15ft SE groundswell (14 seconds, energy 8220). Experts only. Heavy, powerful, and clean.
Into the first week of September, more big groundswell, but with cross-onshore wind keeping things challenging.
Bottom line: the best windows are the 22nd through the 25th of August for clean, quality surf. The 29th is the big-wave day for the real crew. The rest is mostly for washing your car.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Wed afternoon. Warm (max 29°C on Mon afternoon, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 58mm), heaviest during Fri night. Warm (max 31°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 | ||||||||||||||
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 9 | E 9 | E 9 | E 9 | ESE 8 | E 8 | E 8 | SSE 9 | SSE 10 | SSE 11 | SSE 10 | SSE 10 | S 9 | S 9 | S 9 | S 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 192 | 228 | 225 | 134 | 104 | 102 | 119 | 217 | 68 | 104 | 217 | 543 | 586 | 356 | 282 | 207 | 280 | 282 | 240 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross | glassy | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross | cross-off | cross-off | cross-off | off | cross-off | off |
High Tide | 8:24AM2.07m | 8:40PM2.10m | 9:08AM1.93m | 9:08PM2.04m | 10:00AM1.78m | 9:38PM1.97m | 11:12AM1.62m | 10:15PM1.88m | 1:15PM1.55m | 11:10PM1.79m | 3:33PM1.65m | 00:50AM1.73m | |||||||
Low Tide | 2:20AM0.62m | 2:30PM0.63m | 2:58AM0.61m | 3:01PM0.83m | 3:41AM0.63m | 3:33PM1.04m | 4:34AM0.67m | 4:11PM1.24m | 5:47AM0.70m | 5:15PM1.43m | 7:22AM0.69m | 7:52PM1.52m | |||||||
 |  | |  | | |  |  | | | | | |  | | | | | | |
 | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — |
 | 6:57 | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — |
mm | — | — | — | 3 | — | — | 3 | 3 | 10 | 10 | 3 | 5 | 13 | 8 | 6 | 13 | — | — | — |
Temp °C | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 27 | 26 | 31 | 31 | 27 |
Feels °C | 31 | 31 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 33 | 32 | 31 | 31 | 31 | 30 | 29 | 33 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 | S 8 | E 8 | E 8 | SSE 9 | SSE 10 | SSE 11 | SSE 10 | SSE 10 | S 9 | SSE 9 | S 9 | S 9 |
| kJ | 192 | 228 | 225 | 134 | 104 | 102 | 119 | 4 | 68 | 104 | 217 | 543 | 586 | 356 | 282 | 207 | 177 | 165 | 127 |
Swell 2 Height (m) Direction Period (s) | S 8 | S 8 | S 8 | S 8 | SSE 5 | SSE 6 | SSE 6 | ENE 8 | SSE 6 | SSE 6 | E 8 | E 8 | E 8 | ESE 10 | E 9 | E 8 | E 9 | E 8 | ESE 10 |
| kJ | 31 | 19 | 18 | 29 | 8 | 13 | 12 | 14 | 11 | 18 | 55 | 43 | 29 | 33 | 61 | 22 | 38 | 20 | 33 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 11 | SE 11 | SE 11 | S 7 | SE 10 | SW 9 | S 8 | SE 10 | SSE 8 | S 11 | SE 10 | SE 10 | ENE 7 | E 14 | ESE 11 | ESE 11 | ESE 10 | E 8 |
| kJ | 19 | 31 | 30 | 30 | 4 | 17 | 3 | 4 | 16 | 21 | 66 | 26 | 26 | 15 | 4 | 22 | 12 | 37 | 18 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | ESE 8 | ESE 5 | — | — | — | — | — | — | — | S 9 | S 9 | S 9 |
| kJ | — | — | — | — | — | — | — | 217 | 47 | — | — | — | — | — | — | — | 280 | 282 | 240 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 359 | 0 | 50 | 803 | 283 | 283 | 850 | 8 | 48 | 330 | 38 | 0 | 330 | 0 | 0 | 326 | 0 |
Best forecast wave conditions in Kyu Shu | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
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Information about the Aoshima Surf forecast
The above surf forecast table for Aoshima provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Aoshima can be found by selecting the local surf guide option on the grey menu. Our Aoshima 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 (Aoshima) 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 Aoshima 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.
Aoshima is 14 km (9 miles) from Miyazaki-shi. If you plan a holiday in Kyu Shu, look for hotels and other accommodation in Miyazaki-shi. Miyazaki-shi has rooms for a wide range of budgets as well as car hire and transport links.
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