Surf Forecasts:
Aoshima Harbour surf forecast from 23 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 3AM (local time) - 10ft (3.0m), 16s period, SE swell with cross-onshore winds.
- Most powerful swell: Tuesday 25 Aug, 9PM (local time) - 13ft (4.0m), 15s period, SE swell with 7,126 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 3AM (local time) - 10ft (3.0m), 16s period with SE 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 Tuesday (Aug 25) at 3AM. The primary swell is predicted to be 3.0m and 16s period with a secondary swell of 0.9m and 6s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Aoshima Harbour in the next 16 days are 4.0m 15s and forecast to arrive on Tuesday (Aug 25) at 9PM. 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+) | 3AM (Tue 25th Aug) | 10ft (3.0m) 16s |
| Best Surf | 3AM (Tue 25th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 9PM (Tue 25th Aug) | 13ft (4.0m) 15s |
Table - best surf conditions forecast for Aoshima Harbour over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming our way for Aoshima Harbour.
Things are looking a bit grim to kick things off. We’ve got a patch of messy, blown-out conditions right through the end of August. The swell is massive, but the wind is consistently on it or cross-onshore, turning it into a washing machine. Honestly, for the first few days, you’re better off just watching from the shore. There’s a definite gap in quality surf from the start of the forecast until we get a little breather.
The first real glimmer of hope shows up on Saturday, August 29th, in the morning. The wind drops to almost nothing, going glassy, and we’ve got a clean 4ft swell from the SSE. The energy is weak at 331, but it’s the best conditions we’ve seen by a mile. The wave period is a short 8 seconds, so it won’t be a groundswell, but for a beach/jetty setup, that glassy surface is a golden ticket. You might have to share the water as crowds are sometimes an issue, but when it’s this clean, it’s worth it.
After that brief window, we’re back into a long stretch of poor to marginal surf. The wind picks up again, and the swell gets inconsistent or just too messy. There’s a couple of mornings in early September with some clean-ish conditions, but the swell is either too small or too onshore. The period does get longer, up to 15-17 seconds on the 5th and 6th of September, which is a very long period groundswell. That’s great for energy, but for a beach/jetty, it can be a bit too straight and walled up. The winds are cross-onshore, so it’s not going to be the clean, peel-y wave you’d want for a long period swell.
The water temperature is about average for the time of year, so no need to dig out the 5/4 just yet.
Honestly, if you’re hanging out for a wave, that Saturday morning glass-off is the standout. It’s the cleanest, most surfable window in the whole 16 days. The rest is a tough call, with a lot of wind and swell that’s either too big and messy, or too small and weak. It’s the kind of run that’s more interesting for a kite surfer than a regular paddle surfer, except for that one golden morning.
Stay tuned, though. Things can change.
Rusty.
Short Range ForecastHeavy rain (total 49mm), heaviest during Wed morning. Warm (max 28°C on Mon morning, min 26°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 68mm), heaviest during Thu morning. Warm (max 29°C on Sat afternoon, min 26°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 12 | ESE 13 | ESE 17 | ESE 16 | SE 16 | SE 15 | SE 14 | SE 12 | SSE 11 | SE 9 | SE 8 | SE 8 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 138 | 346 | 2488 | 3785 | 6621 | 6271 | 6705 | 2879 | 2574 | 654 | 567 | 553 | 878 | 464 | 388 | 264 | 212 | 176 | 146 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | glassy | glassy | cross | off |
High Tide | 2:33AM1.77m | 5:05PM1.93m | 3:44AM1.89m | 5:34PM2.03m | 4:36AM2.02m | 6:00PM2.11m | 5:21AM2.13m | 6:25PM2.16m | 6:01AM2.21m | 6:50PM2.18m | 6:40AM2.24m | 7:14PM2.19m | |||||||
Low Tide | 9:39PM1.43m | 9:52AM0.46m | 10:31PM1.29m | 10:39AM0.34m | 11:08PM1.13m | 11:19AM0.27m | 11:41PM0.97m | 11:55AM0.25m | 00:12AM0.81m | 12:28PM0.27m | 00:42AM0.68m | 12:59PM0.35m | 1:14AM0.58m | ||||||
 |  | | | |  |  | | | | | | | | | | | |  | |
 | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — |
 | 6:50 | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — |
mm | — | — | — | — | — | 3 | 21 | 13 | 12 | 22 | 14 | 8 | 9 | 6 | 5 | 4 | — | — | — |
Temp °C | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 29 | 27 |
Feels °C | 31 | 30 | 30 | 31 | 29 | 29 | 32 | 31 | 31 | 29 | 31 | 32 | 31 | 32 | 32 | 32 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | E 10 | ESE 13 | ESE 17 | ESE 16 | SE 16 | SE 15 | SE 14 | SE 12 | SE 11 | SE 9 | SE 8 | SE 8 | SE 8 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 |
| kJ | 125 | 346 | 2488 | 3785 | 6621 | 6271 | 6705 | 2879 | 1871 | 654 | 567 | 553 | 343 | 464 | 388 | 264 | 212 | 176 | 146 |
Swell 2 Height (m) Direction Period (s) | ESE 12 | E 10 | S 8 | SE 6 | ENE 9 | E 15 | E 15 | E 14 | E 13 | S 10 | E 12 | E 12 | S 9 | ESE 11 | E 13 | E 13 | E 12 | E 12 | E 12 |
| kJ | 138 | 66 | 4 | 54 | 26 | 157 | 38 | 57 | 84 | 264 | 67 | 71 | 235 | 37 | 87 | 125 | 112 | 104 | 99 |
Swell 3 Height (m) Direction Period (s) | S 8 | SE 5 | E 12 | ESE 6 | E 16 | E 15 | — | — | — | E 13 | E 16 | E 16 | E 12 | E 14 | ESE 10 | S 12 | SE 13 | SE 13 | SE 11 |
| kJ | 20 | 12 | 47 | 65 | 44 | 69 | — | — | — | 85 | 5 | 20 | 69 | 58 | 35 | 3 | 7 | 7 | 5 |
Wind waves Height (m) Direction Period (s) | — | — | SE 5 | — | — | ENE 9 | — | ESE 9 | SSE 11 | — | — | — | SSE 9 | — | — | — | — | — | — |
| kJ | — | — | 24 | — | — | 15 | — | 641 | 2574 | — | — | — | 878 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 49 | 312 | 49 | 49 | 330 | 49 | 202 | 297 | 202 | 202 | 76 | 39 | 49 | 312 | 0 | 0 | 312 | 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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