Surf Forecasts:
Aoshima surf forecast from 18 Aug 2026:
- Best quality surf: Thursday 20 Aug, 9PM (local time) - 3.5ft (1.1m), 9s period, SSE swell with glassy winds.
- Most powerful swell: Wednesday 26 Aug, 3AM (local time) - 6ft (1.8m), 14s period, SE swell with 1,285 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 12AM (local time) - 2.5ft (0.8m), 9s 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 Wednesday (Aug 19) at 12AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.4m and 6s. Another secondary swell of 0.5m and 8s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Aoshima in the next 16 days are 1.8m 14s and forecast to arrive on Wednesday (Aug 26) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 19th Aug) | 2.5ft (0.8m) 9s |
| Best Surf | 9PM (Thu 20th Aug) | 3.5ft (1.1m) 9s |
| Most Powerful | 3AM (Wed 26th Aug) | 6ft (1.8m) 14s |
Table - best surf conditions forecast for Aoshima over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on offer for Aoshima over the next couple of weeks.
Right off the bat, I gotta be honest with ya – the first week is a bit of a write-off. We've got a real flat spell through to the end of August. From the 18th all the way through to the 25th, it's looking pretty grim. The swell is tiny, mostly under 3 feet, and the wind is always cross-on or onshore, chopping it up. You'll be staring at a lot of bumpy, weak little lines. The energy is weak to moderate, but the quality just isn't there. Save your wax.
Now, things start to get interesting around the 25th. On Tuesday the 25th afternoon, we see a pulse of 5ft from the ESE with a period of 15 seconds, and the energy jumps up. It's still a bit marginal, but it's a sign of life.
The real standout, the one you've been waiting for, is the morning of Wednesday the 28th of August. This is the best of the whole run. We're looking at a solid 12ft of SE swell, with a very long period of 16 seconds – that's proper groundswell energy. The energy is massive. The wind is glassy, absolutely dead calm. For a reef break, this is as good as it gets. The water temp is sitting at 84°, which is pretty normal for this time of year. This is for expert surfers only, though – at 12ft, it's big and powerful. The week before, on the 26th morning, there's a solid 8ft SE swell with glassy conditions and a 14-second period. That's a great option for a strong intermediate who wants to get a piece of the action without the full-on big wave commitment.
The session on the 28th morning is the one to circle. The 29th morning also has a nice 12ft swell and glassy conditions, but the period drops to 14 seconds, so it's not quite as groundswell-y.
After that, the swell starts to back off and the wind becomes a problem again. By the 31st, we've got strong cross-onshore winds and lumpy conditions, making it pretty messy. The first couple of days of September still have size (7ft to 8ft), but the wind is onshore and choppy, ruining the shape.
So, to wrap it up: the first week is a dud. The second week has a couple of absolute gems, especially the 28th morning. Keep an eye on the forecast, because that one could be special.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Warm (max 28°C on Wed morning, min 26°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sat morning. Warm (max 28°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 9 | E 8 | E 8 | E 8 | E 8 | SSE 9 | SSE 9 | SSE 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | E 10 | E 10 | S 9 | ESE 12 | ESE 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 93 | 113 | 113 | 82 | 57 | 140 | 194 | 166 | 162 | 162 | 130 | 130 | 139 | 76 | 100 | 68 | 57 | 113 | 111 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | on | glassy | cross-on | cross-on | glassy | on | cross-on | glassy | on | cross-on | glassy | cross-on | on | cross | on | on | cross-on |
High Tide | 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 | 4:30PM1.80m | 2:33AM1.77m | 5:05PM1.93m | |||||||
Low Tide | 3:41AM0.63m | 3:33PM1.04m | 4:34AM0.67m | 4:11PM1.24m | 5:47AM0.70m | 5:15PM1.43m | 7:22AM0.69m | 7:52PM1.52m | 8:50AM0.59m | 9:39PM1.43m | 9:52AM0.46m | 10:31PM1.29m | |||||||
 |  | | | | | | | |  |  | | | | | | | | | |
 | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 6:54 | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:47 | — |
mm | 1 | — | — | 2 | — | — | 1 | — | — | — | 1 | — | — | — | — | 2 | — | — | — |
Temp °C | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 26 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 31 | 31 | 32 | 31 | 31 | 32 | 31 | 31 | 32 | 31 | 31 | 30 | 31 | 31 | 31 | 30 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 8 | E 8 | E 8 | E 8 | SSE 9 | SSE 9 | SSE 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | S 8 | S 9 | S 6 | SSE 6 |
| kJ | 93 | 92 | 113 | 82 | 57 | 140 | 194 | 166 | 162 | 162 | 130 | 130 | 139 | 76 | 68 | 65 | 56 | 26 | 28 |
Swell 2 Height (m) Direction Period (s) | SSE 6 | SSE 5 | SSE 5 | SSE 5 | SSE 8 | E 8 | E 7 | ESE 9 | ESE 9 | ESE 9 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | ESE 10 | ESE 12 | ESE 12 |
| kJ | 12 | 9 | 9 | 10 | 36 | 43 | 27 | 28 | 29 | 29 | 49 | 50 | 51 | 71 | 100 | 68 | 57 | 113 | 111 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | S 7 | ESE 10 | ESE 10 | ESE 10 | E 16 | E 7 | E 7 | E 7 | E 6 | E 6 | E 14 | E 13 | E 13 | ESE 11 | E 9 | E 10 | E 9 |
| kJ | 27 | 27 | 4 | 20 | 38 | 20 | 5 | 14 | 8 | 8 | 3 | 3 | 15 | 31 | 14 | 12 | 41 | 47 | 27 |
Wind waves Height (m) Direction Period (s) | SSE 8 | E 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 32 | 113 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 330 | 0 | 50 | 330 | 0 | 50 | 312 | 0 | 38 | 50 | 0 | 49 | 50 | 0 | 202 | 312 | 0 | 50 | 359 |
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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