Surf Forecasts:
Aoshima Harbour surf forecast from 6 Aug 2026:
- Best quality surf: Thursday 6 Aug, 6PM (local time) - 23ft (7.0m), 15s period, ESE swell with onshore winds.
- Most powerful swell: Thursday 6 Aug, 6PM (local time) - 23ft (7.0m), 15s period, ESE swell with 19,859 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 6PM (local time) - 23ft (7.0m), 15s period with ESE swell.
Best Forecast Surf Conditions for Aoshima Harbour this week:
The surf forecast for Aoshima Harbour over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 06) at 6PM. The primary swell is predicted to be 7.0m and 15s period with a secondary swell of 6.0m and 15s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Aoshima Harbour in the next 16 days are 7.0m 15s and forecast to arrive on Thursday (Aug 06) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Thursday (Aug 13) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Thu 6th Aug) | 23ft (7.0m) 15s |
| Best Surf | 6PM (Thu 6th Aug) | 23ft (7.0m) 15s |
| Most Powerful | 6PM (Thu 6th Aug) | 23ft (7.0m) 15s |
Table - best surf conditions forecast for Aoshima Harbour over the next 16 days.
The Lowdown
Alright, let’s cut to the chase. The next 16 days at Aoshima Harbour are looking like a tough stretch for a decent surf. We’ve got a huge, messy swell hitting right at the start, then a long run of small, onshore junk. It’s not a classic run of waves.
It all kicks off on Thursday, August 6th, but it’s not a day for a paddle. We’re talking a massive 18ft to 23ft swell from the ESE, with a very long period of 15 seconds, but it’s howling onshore at 28 mph. The combined wave energy is huge – 12634 to 38741 (moderate to very strong). This is way too big for anyone but the experts, and even then, the wind is making it a total mess. It’s a kite-surfing setup, not a paddle surf one.
The same blown-out, oversized theme runs into Friday the 7th and Saturday the 8th. Swell hangs around 10ft to 18ft with strong onshore winds. The water temperature is 85°, which is about average for this time of year.
From Sunday the 9th through to the 12th of August, the swell drops, but the quality doesn’t. We’re looking at smaller, choppy waves with cross-onshore winds, mostly producing poor surf conditions. The combined energy drops to 643 (weak) to 1543 (moderate). There’s a tiny window on Wednesday the 12th morning when the wind goes glassy, and the swell is a tiny 4ft from the SSE, but the period is only 10 seconds. It’s a marginal, small option.
The real standout, if you can call it that, is the morning of Thursday, August 13th. The wind is glassy, and the swell is a tiny 3ft from the E with a 9-second period. The combined energy is weak at 242. It’s not going to be pumping, but it will be the cleanest, most surfable window in the entire 16-day forecast.
After that, from the 14th of August onwards, it’s a long run of poor to marginal conditions. The wind picks up again, and the swell remains small and onshore. The break is fairly consistent, so it tends not to stay this poor for long, but this particular forecast is a real test of patience. The best advice is to keep an eye on that Thursday the 13th morning window for a clean, small wave.
Rusty.
Short Range ForecastHeavy rain (total 114mm), heaviest during Sat night. Warm (max 28°C on Thu morning, min 27°C on Thu night). Winds decreasing (strong winds from the ENE on Thu afternoon, moderate winds from the ESE by Sat night). | Days 4-6 Weather SummaryHeavy rain (total 71mm), heaviest during Sun morning. Warm (max 29°C on Tue morning, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | |||||||||||||||
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) | ESE 15 | ESE 15 | ESE 14 | ESE 13 | SE 13 | SSE 13 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 13 | SE 8 | E 12 | E 12 | E 11 | E 11 | SSE 10 | SSE 10 | SSE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 12634 | 22790 | 14695 | 10515 | 4265 | 3331 | 1582 | 1350 | 1074 | 1008 | 891 | 511 | 581 | 469 | 347 | 264 | 237 | 189 | 232 | 176 | 128 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | glassy | cross | off |
High Tide | 12:18PM1.56m | 11:14PM1.84m | 2:34PM1.58m | 00:24AM1.79m | 4:09PM1.71m | 1:55AM1.79m | 4:58PM1.85m | 3:13AM1.86m | 5:33PM1.97m | 4:12AM1.96m | 6:03PM2.06m | 5:01AM2.07m | 6:31PM2.13m | ||||||||
Low Tide | 5:04PM1.28m | 6:56AM0.70m | 6:41PM1.44m | 8:23AM0.61m | 8:51PM1.47m | 9:33AM0.47m | 10:08PM1.38m | 10:25AM0.34m | 10:56PM1.27m | 11:09AM0.24m | 11:33PM1.13m | 11:47AM0.18m | 00:07AM1.00m | ||||||||
 | |  | | | | | | | | | | | | |  | |  |  | |  | |
 | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — |
 | — | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — |
mm | 4 | 5 | 18 | 11 | 9 | 21 | 9 | 9 | 28 | 19 | 12 | 19 | 10 | 8 | 3 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 28 | 28 | 27 | 29 | 29 | 27 | 28 | 28 | 26 |
Feels °C | 26 | 26 | 26 | 26 | 27 | 27 | 30 | 29 | 28 | 28 | 28 | 28 | 30 | 29 | 28 | 31 | 31 | 31 | 31 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 15 | ESE 16 | SE 14 | SE 13 | SE 13 | SSE 13 | SSE 12 | S 11 | S 11 | S 12 | S 11 | E 13 | E 13 | E 13 | ESE 7 | E 12 | SE 7 | SSE 7 | SSE 10 | SSE 10 | SSE 10 |
| kJ | 12634 | 15951 | 13019 | 8564 | 4265 | 3331 | 1211 | 675 | 426 | 333 | 256 | 511 | 581 | 466 | 263 | 264 | 144 | 81 | 232 | 176 | 128 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | ENE 15 | E 15 | E 15 | E 15 | E 14 | E 13 | S 11 | S 11 | S 12 | E 12 | S 7 | E 11 | E 11 | E 10 | E 10 | E 10 |
| kJ | — | — | — | — | — | 21 | 17 | 17 | 39 | 106 | 284 | 284 | 151 | 169 | 347 | 112 | 237 | 189 | 138 | 98 | 94 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 16 | SE 16 | S 15 | S 15 | S 15 | S 15 | S 8 | S 11 | S 11 | S 11 | SE 13 | SE 7 | ESE 7 |
| kJ | — | — | — | — | — | — | — | — | 10 | 10 | 112 | 113 | 107 | 39 | 95 | 157 | 154 | 146 | 7 | 2 | 5 |
Wind waves Height (m) Direction Period (s) | — | ESE 15 | ESE 14 | ESE 13 | E 11 | ESE 10 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 8 | — | ESE 6 | — | — | — | — | — |
| kJ | — | 22790 | 14695 | 10515 | 3046 | 2081 | 1582 | 1350 | 1074 | 1008 | 891 | 508 | 560 | 469 | — | 110 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 361 | 803 | 288 | 803 | 803 | 288 | 700 | 791 | 202 | 284 | 233 | 233 | 233 | 297 | 202 | 61 | 50 | 0 | 0 | 310 | 0 |
Best forecast wave conditions in Kyu Shu | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Aoshima Harbour Surf forecast
The above surf forecast table for Aoshima Harbour provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Aoshima Harbour can be found by selecting the local surf guide option on the grey menu. Our Aoshima Harbour 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 Harbour) 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 Harbour 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 Harbour is 15 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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