Surf Forecasts:
Aoshima surf forecast from 15 Aug 2026:
- Best quality surf: Saturday 15 Aug, 9PM (local time) - 3ft (0.9m), 10s period, E swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 6AM (local time) - 6.5ft (2.0m), 11s period, SSE swell with 926 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 9PM (local time) - 3ft (0.9m), 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 Saturday (Aug 15) at 9PM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.6m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Aoshima in the next 16 days are 2.0m 11s and forecast to arrive on Friday (Aug 21) at 6AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 15th Aug) | 3ft (0.9m) 10s |
| Best Surf | 9PM (Sat 15th Aug) | 3ft (0.9m) 10s |
| Most Powerful | 6AM (Fri 21st Aug) | 6.5ft (2.0m) 11s |
Table - best surf conditions forecast for Aoshima over the next 16 days.
The Lowdown
G'day, Rusty here. Let's have a look at what's on the cards for Aoshima (Japan) over the next couple of weeks.
Right now, the water's sitting at a pretty normal 83°F for this time of year, so nothing weird there. The next few days are a bit of a write-off, to be honest. We've got a mix of glassy starts but then the wind swings cross-on or onshore, and the swell stays small and weak, with combined energy hanging around 137 to 268 (weak). Not much to get excited about from Saturday the 15th through to Wednesday the 20th of August, with most sessions being poor or marginal at best.
The first real standout doesn't roll in until much later. An excellent swell window opens up on Monday the 24th of August. We're looking at a solid 5ft groundswell from the ESE, with a very long period of 18 seconds. The morning is dead calm and glassy – absolute perfection. The combined energy is a massive 1820 (strong), so this is a serious pulse. This is the one to aim for if you're an experienced surfer, but that long period will make it stand up best at the reef, so be ready for some proper lines. The afternoon gets a bit messy with a cross-shore breeze and risk of storms, but the morning is the winner.
Then, on Tuesday the 25th of August, another morning standout: 7ft of ESE swell at 13 seconds, with calm, glassy conditions again. Combined energy hits 1340 (strong). This is another excellent session for the experienced crew – the swell is a bit bigger, so it'll be punchy.
The rest of the week sees the swell gradually ease. Wednesday the 26th still has a clean 5ft morning with glassy conditions (719 combined energy – moderate), but by Thursday the 27th, it's dropping back to 3ft and the afternoons get messy. The second week fades out into small, weak surf under 3ft through to the end of August, with only a few glassy moments but not enough grunt. One interesting note: on Sunday the 30th of August, a very long period 20-second swell from the East shows up, but it's only 2ft in the morning, so it's more of a slow, long period line-up than a proper wave.
So, bottom line: the first week is mostly a dud. The best bet is Monday the 24th of August and Tuesday the 25th of August mornings – get out there early for the cleanest, most powerful waves. After that, it's a slow fade.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 28°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Wed morning. Warm (max 29°C on Thu morning, min 26°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 10 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 | E 8 | E 8 | E 6 | E 7 | SE 8 | SSE 9 | SSE 11 | SSE 10 | SSE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 162 | 165 | 162 | 156 | 162 | 192 | 188 | 181 | 136 | 133 | 126 | 123 | 205 | 230 | 115 | 102 | 418 | 430 | 909 | 839 | 628 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | glassy | glassy | cross-on | glassy | cross-on | cross-on | glassy | on | on | cross-on | on | on | on | on | on | on | on | on | on |
High Tide | 7:48PM2.17m | 7:43AM2.16m | 8:14PM2.14m | 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 | ||||||||
Low Tide | 1:28PM0.32m | 1:45AM0.68m | 1:59PM0.46m | 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 | ||||||||
 |  |  | | |  | | |  | | | |  | |  | | | | | | | |
 | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — |
 | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | 2 | — | 3 | 1 | — | 4 | 4 | 5 | 12 |
Temp °C | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 28 | 27 | 28 | 28 | 26 |
Feels °C | 30 | 30 | 29 | 30 | 30 | 29 | 31 | 32 | 31 | 30 | 31 | 31 | 30 | 30 | 31 | 32 | 31 | 31 | 30 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 | S 8 | S 8 | E 6 | SSE 6 | SSE 8 | SSE 9 | SSE 11 | SSE 10 | SSE 10 |
| kJ | 162 | 165 | 162 | 156 | 162 | 192 | 188 | 181 | 136 | 133 | 126 | 123 | 10 | 10 | 115 | 52 | 230 | 430 | 909 | 839 | 628 |
Swell 2 Height (m) Direction Period (s) | S 9 | SSE 8 | S 8 | S 8 | S 8 | S 8 | SSE 8 | SSE 8 | S 8 | S 7 | S 7 | S 8 | SE 10 | SE 10 | ESE 10 | SE 10 | E 7 | E 6 | E 9 | SE 11 | E 9 |
| kJ | 55 | 57 | 49 | 52 | 34 | 31 | 19 | 19 | 18 | 10 | 10 | 10 | 16 | 16 | 20 | 24 | 77 | 52 | 2 | 30 | 38 |
Swell 3 Height (m) Direction Period (s) | SE 11 | E 10 | SE 10 | SE 10 | — | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 10 | W 9 | W 9 | S 8 | — | — | SSE 12 | — | — | ESE 11 |
| kJ | 18 | 2 | 4 | 4 | — | 32 | 31 | 30 | 30 | 18 | 29 | 16 | 1 | 1 | 1 | — | — | 15 | — | — | 11 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | E 8 | E 8 | — | E 7 | SE 8 | — | E 6 | ENE 5 | E 5 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 205 | 230 | — | 102 | 418 | — | 29 | 23 | 13 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 359 | 0 | 0 | 645 | 0 | 3 | 709 | 0 | 38 | 50 | 38 | 283 | 803 | 38 | 283 | 297 | 50 | 283 | 297 | 50 |
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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