Surf Forecasts:
Aoshima Harbour surf forecast from 20 Aug 2026:
- Best quality surf: Monday 24 Aug, 6PM (local time) - 10ft (3.0m), 18s period, ESE swell with onshore winds.
- Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 20ft (6.0m), 16s period, SE swell with 18,859 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 9PM (local time) - 3ft (0.9m), 9s period with SSE 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 Friday (Aug 21) at 9PM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.4m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Aoshima Harbour in the next 16 days are 6.0m 16s and forecast to arrive on Tuesday (Aug 25) at 6PM. 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+) | 9PM (Fri 21st Aug) | 3ft (0.9m) 9s |
| Best Surf | 6PM (Mon 24th Aug) | 10ft (3.0m) 18s |
| Most Powerful | 6PM (Tue 25th Aug) | 20ft (6.0m) 16s |
Table - best surf conditions forecast for Aoshima Harbour over the next 16 days.
The Lowdown
Alright, let’s get into it for Aoshima Harbour. The first week or so is a dry spell. There’s a big gap of weak, onshore slop from now through the 24th of August. Small waves, poor conditions, not worth your time. The swell just isn’t there.
Things start to wake up Monday the 24th of August. A long-period groundswell from the ESE at 5 ft, with a period of 17 seconds, and combined energy of 1501. That’s a moderate to strong pulse. The wind is still cross-onshore, so it’s a bit lumpy, but the power is there. By Monday afternoon the swell bumps to 8 ft, same direction, energy 3157—still onshore, but you can feel the potential.
The clear standout is Thursday the 27th of August. Thursday morning gives you a clean 8 ft swell from the SE, period 10 seconds, and energy 1413. The wind is offshore from the WSW at 9 mph, giving you clean, glassy conditions. That’s a solid, powerful swell—strictly for experienced surfers, since it’s over 8 ft—but the quality is excellent. Water temp is about average for the time of year, no surprises.
Keep in mind, the two days before that, Tuesday the 25th and Wednesday the 26th, bring massive swell—up to 20 ft on Tuesday with energy over 18000, and 15 ft on Wednesday. Those are way too big for Aoshima Harbour, even with favorable winds. That’s kite-surfing territory, not paddle surfing. Stay out of the water those days.
After the 27th, surf drops off again with a few marginal days, then another pulse of big swell around the 3rd of September—13 ft to 15 ft from the ESE with long periods and very high energy, but again too big for this spot. So really, Thursday the 27th is your one good window. It’s a wait-and-pounce situation, and that’s the day to pounce.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Warm (max 28°C on Fri morning, min 26°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 55mm), heaviest during Tue night. Warm (max 31°C on Wed afternoon, min 25°C on Tue night). Winds increasing (calm on Sun night, gales from the N by Tue night). | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | SSE 9 | SSE 9 | SSE 9 | SSE 9 | E 10 | E 10 | E 10 | E 10 | E 10 | ESE 12 | ESE 17 | ESE 17 | ESE 17 | ESE 17 | ESE 16 | SE 14 | SE 11 | SE 10 | SE 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 176 | 132 | 137 | 106 | 70 | 71 | 73 | 71 | 78 | 103 | 1094 | 3057 | 7628 | 13742 | 18030 | 16692 | 5081 | 3393 | 2448 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross-on | glassy | on | on | cross-on | cross-on | cross-on | glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off |
High Tide | 10:15PM1.88m | 1:15PM1.55m | 11:10PM1.79m | 3:33PM1.65m | 00:50AM1.73m | 4:30PM1.80m | 2:33AM1.77m | 5:05PM1.93m | 3:44AM1.89m | 5:34PM2.03m | 4:36AM2.02m | 6:00PM2.11m | |||||||
Low Tide | 5:47AM0.70m | 5:15PM1.43m | 7:22AM0.69m | 7:52PM1.52m | 8:50AM0.59m | 9:39PM1.43m | 9:52AM0.46m | 10:31PM1.29m | 10:39AM0.34m | 11:08PM1.13m | 11:19AM0.27m | 11:41PM0.97m | |||||||
 |  |  | | | |  | | | |  | | | | |  |  | | | |
 | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — |
 | 6:52 | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | 2 | — | — | — | 1 | — | — | — | 4 | 42 | 8 | — | — |
Temp °C | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 28 | 27 | 30 | 31 | 28 |
Feels °C | 33 | 32 | 31 | 32 | 31 | 31 | 32 | 31 | 32 | 32 | 29 | 30 | 30 | 27 | 26 | 22 | 27 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SSE 9 | SSE 9 | SSE 9 | S 8 | S 8 | E 10 | E 10 | E 10 | E 10 | ESE 17 | ESE 17 | ESE 17 | ESE 17 | ESE 16 | SE 14 | SE 12 | E 19 | E 18 |
| kJ | 176 | 132 | 137 | 106 | 69 | 71 | 73 | 71 | 78 | 69 | 1094 | 3057 | 7628 | 13742 | 18030 | 12610 | 4520 | 7 | 25 |
Swell 2 Height (m) Direction Period (s) | E 9 | ESE 9 | ESE 9 | E 9 | E 10 | E 10 | S 9 | S 8 | S 8 | ESE 12 | ESE 13 | ESE 6 | E 12 | E 15 | — | E 14 | — | E 19 | E 18 |
| kJ | 37 | 28 | 29 | 60 | 70 | 71 | 55 | 35 | 34 | 103 | 265 | 53 | 45 | 41 | — | 103 | — | 7 | 25 |
Swell 3 Height (m) Direction Period (s) | E 16 | E 7 | E 7 | E 14 | E 14 | SE 9 | E 14 | ESE 4 | ESE 13 | ESE 5 | E 10 | E 12 | — | — | — | — | — | — | E 18 |
| kJ | 5 | 14 | 8 | 4 | 4 | 3 | 15 | 6 | 35 | 10 | 122 | 47 | — | — | — | — | — | — | 25 |
Wind waves Height (m) Direction Period (s) | — | E 9 | — | — | — | E 9 | — | — | ESE 6 | — | ESE 5 | — | E 7 | — | — | SE 14 | SE 11 | SE 10 | SE 10 |
| kJ | — | 56 | — | — | — | 56 | — | — | 21 | — | 20 | — | 243 | — | — | 16692 | 5081 | 3393 | 2448 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 39 | 49 | 0 | 49 | 312 | 9 | 19 | 49 | 0 | 202 | 49 | 49 | 76 | 496 | 202 | 496 | 496 | 6 |
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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