Surf Forecasts:
Aoshima Harbour surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6AM (local time) - 10ft (3.0m), 17s period, ESE swell with cross-onshore winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 10ft (3.0m), 17s period, ESE swell with 5,287 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 12AM (local time) - 2.5ft (0.8m), 8s period with E 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 20) at 12AM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.4m and 6s. 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 3.0m 17s and forecast to arrive on Tuesday (Aug 25) at 9AM. 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 (Thu 20th Aug) | 2.5ft (0.8m) 8s |
| Best Surf | 6AM (Tue 25th Aug) | 10ft (3.0m) 17s |
| Most Powerful | 9AM (Tue 25th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Aoshima Harbour over the next 16 days.
The Lowdown
Alright, let’s get into it.
First week at Aoshima Harbour is a real bummer – tiny waves, dirty wind, nothing doing. From Tuesday the 18th through Sunday the 23rd, we’re looking at weak, small swells of 2ft to 3ft from the E or SSE, with periods of just 8 to 10 seconds. The combined energy is weak to moderate (150 to 252), so no real punch. Wind is light but always cross-onshore, leaving the surface choppy. Water temp is a warm 83° – right on average for this time of year – but there’s no surf to enjoy it with.
Things get more interesting around Monday the 24th. Swell picks up to 5ft to 6ft from the ESE, with periods stretching to 17 and 18 seconds. That’s real groundswell, with strong energy (1339 to 2165). But the wind stays cross-onshore or onshore, so it’s lumpy and messy. Only marginal surf quality at best.
Now the big standout: from Tuesday the 25th through Thursday the 27th, the swell goes off – 10ft to 13ft from the SE, with 16-second periods and combined energy readings of 5395, 5228, up to 7478. That’s massive, powerful energy. But the forecast says it’s too big for this break, and the wind is cross-onshore. This is experts only, and even then it’s a handful. The setup might be more interesting for kite surfing than paddle surfing at that size. The Wednesday and Thursday mornings have very light wind, so it might not be total chaos, but it’s still going to be huge and raw.
Swell drops a bit by Friday the 28th – still a solid 8ft to 10ft from the SSE, with 14-second periods. The morning of the 28th has very light wind and might offer the best chance for a few brave souls to get some clean-ish, oversized waves. The combined energy is still very strong (3082 to 4031). After that, the weekend of the 30th and 31st gets totally blown out by strong winds – 22 to 28 mph from the N and NNE, making a complete mess of the 7ft to 8ft swell. Not worth it.
The very end of the run, around the 1st and 2nd of September, sees the swell drop back to 6ft to 7ft, with periods around 11 to 12 seconds, but the wind is all over the place – cross-off, cross, and onshore. The energy is still moderate to strong (1061 to 1815), but the quality just isn’t there.
Honestly, the best of a tricky bunch is the morning of Friday the 28th of August – the swell is big but manageable, wind is light, and there’s a chance of some decent, powerful waves. Everything else is either too small, too windy, or way too big for comfort.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Tue night. Warm (max 29°C on Thu afternoon, min 26°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Fri morning. Warm (max 28°C on Fri morning, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 9 | E 9 | E 9 | E 9 | E 8 | E 8 | SSE 8 | SSE 9 | SSE 9 | SSE 9 | S 9 | SSE 9 | S 9 | S 9 | S 8 | E 10 | E 10 | E 10 | ESE 18 | ESE 17 | ESE 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 132 | 102 | 93 | 125 | 113 | 82 | 63 | 151 | 208 | 169 | 162 | 132 | 101 | 74 | 68 | 70 | 70 | 96 | 1245 | 2072 | 3728 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | on | glassy | cross-on | cross-on | glassy | on | cross-on | glassy | on | cross-on | glassy | cross-on | on | glassy | cross-on | on | cross-on |
High Tide | 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 | 4:30PM1.80m | 2:33AM1.77m | 5:05PM1.93m | ||||||||
Low Tide | 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 | 8:50AM0.59m | 9:39PM1.43m | 9:52AM0.46m | 10:31PM1.29m | ||||||||
 | |  |  |  | | | | | | |  | | |  | | | | | | | |
 | 5:39 | — | — | 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 | 1 | — | 2 | 1 | — | 2 | 1 | — | — | — | — | 2 | 1 | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 31 | 31 | 31 | 31 | 33 | 32 | 33 | 34 | 32 | 31 | 32 | 31 | 31 | 32 | 31 | 31 | 32 | 31 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | SSE 8 | SSE 9 | SSE 9 | SSE 9 | S 9 | SSE 9 | S 9 | S 9 | S 8 | E 10 | E 10 | E 10 | ESE 18 | ESE 17 | ESE 17 |
| kJ | 132 | 102 | 93 | 92 | 113 | 82 | 63 | 151 | 208 | 169 | 162 | 132 | 101 | 74 | 68 | 70 | 70 | 96 | 1245 | 2072 | 3728 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | SSE 5 | SSE 6 | SSE 5 | SSE 5 | SSE 6 | E 8 | E 8 | E 8 | ESE 9 | ESE 9 | ESE 9 | E 10 | E 10 | E 10 | S 8 | S 8 | ESE 13 | E 9 | E 9 | E 9 |
| kJ | 8 | 10 | 12 | 8 | 8 | 10 | 55 | 44 | 28 | 28 | 29 | 29 | 48 | 71 | 50 | 48 | 32 | 69 | 62 | 41 | 41 |
Swell 3 Height (m) Direction Period (s) | S 7 | S 7 | SE 10 | SE 10 | S 7 | ESE 10 | SE 10 | ESE 10 | E 16 | E 7 | E 7 | E 7 | E 6 | SE 9 | E 14 | ESE 14 | ESE 14 | S 8 | S 8 | S 8 | S 8 |
| kJ | 10 | 4 | 27 | 27 | 4 | 20 | 25 | 19 | 5 | 8 | 8 | 8 | 7 | 3 | 15 | 36 | 66 | 31 | 32 | 32 | 28 |
Wind waves Height (m) Direction Period (s) | — | — | — | E 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSE 8 | — |
| kJ | — | — | — | 125 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 20 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 330 | 39 | 49 | 854 | 0 | 49 | 330 | 0 | 49 | 49 | 0 | 49 | 49 | 0 | 49 | 49 | 0 | 49 | 330 | 19 |
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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