Surf Forecasts:
Aha Rivermouth surf forecast from 30 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 6PM (local time) - 7ft (2.2m), 9s period, E swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 12PM (local time) - 8ft (2.5m), 8s period, ESE swell with 1,003 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 6PM (local time) - 7ft (2.2m), 9s period with E swell.
Best Forecast Surf Conditions for Aha Rivermouth this week:
The surf forecast for Aha Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 01) at 6PM. The primary swell is predicted to be 2.2m and 9s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 2.5m 8s and forecast to arrive on Tuesday (Sep 01) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 8s period and expected on Thursday (Sep 03) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Tue 1st Sep) | 7ft (2.2m) 9s |
| Best Surf | 6PM (Tue 1st Sep) | 7ft (2.2m) 9s |
| Most Powerful | 12PM (Tue 1st Sep) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Alright, Rusty here. Gotta level with you – the next couple weeks are mostly a bust for Aha Rivermouth. There’s a big dry spell from Sunday, August 30th all the way through Thursday, September 10th. That’s a solid 12 days with no good surf. Winds are all onshore or cross-shore, kickin’ up a chop, and the swell never gets a clean look. The wave energy is moderate (200 to 1295), but it’s all poor conditions. Not a single session worth paddlin’ for.
Then on Friday, September 11th, the wind goes glassy in the morning. You get a 2.4m swell from the ENE, strong energy (1416), and it’s clean. But it’s a short-period windswell at 9 seconds, and the quality drops off in the afternoon due to tide. It’s okay for experienced surfers, but nothin’ to write home about.
The real standout is Saturday, September 12th. That morning you’ve got a 5.5m swell from the SE with a 16-second period, and it grows to 12.0m from the E with a 17-second period in the afternoon. This is very long-period groundswell, and the energy is insane (19256 in the AM, 156055 in the PM). The wind is a moderate cross-shore, so it’s clean. But this is for experts only – way too big for anyone else. Aha Rivermouth is a beach and jetty spot, so a long-period swell this size will be a straight, fast beast. Crowds are possible, so only the brave will be out. The water temp is about average for the time of year.
After that, Sunday and Monday are back to poor conditions with onshore winds. So Saturday is your one shot, but it’s a long way out, so it’s promising but not locked in yet.
Rusty out.
Short Range ForecastModerate rain (total 18mm), heaviest on Tue morning. Warm (max 28°C on Sun morning, min 27°C on Sun afternoon). Winds decreasing (fresh winds from the E on Mon night, light winds from the SSE by Tue afternoon). | Days 4-6 Weather SummaryHeavy rain (total 46mm), heaviest during Wed night. Warm (max 28°C on Wed afternoon, min 27°C on Wed morning). Winds decreasing (strong winds from the SSE on Wed night, light winds from the ESE by Fri night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 7 | ESE 7 | ESE 7 | ESE 7 | ESE 9 | ESE 8 | ESE 8 | ESE 9 | E 9 | ESE 8 | E 8 | E 8 | SE 7 | ENE 11 | E 8 | ESE 7 | E 7 | E 10 | E 10 | E 10 | SE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 105 | 111 | 118 | 158 | 477 | 824 | 953 | 888 | 664 | 845 | 513 | 278 | 429 | 37 | 55 | 68 | 34 | 53 | 68 | 68 | 227 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | on |
High Tide | 8:08PM2.03m | 8:20AM2.05m | 8:34PM2.03m | 9:00AM1.97m | 9:03PM2.00m | 9:45AM1.84m | 9:34PM1.95m | 10:38AM1.67m | 10:11PM1.87m | 11:54AM1.50m | 10:59PM1.76m | 2:11PM1.44m | 00:22AM1.66m | ||||||||
Low Tide | 1:58PM0.39m | 2:12AM0.48m | 2:28PM0.49m | 2:48AM0.43m | 2:59PM0.63m | 3:28AM0.42m | 3:32PM0.79m | 4:15AM0.47m | 4:07PM0.97m | 5:15AM0.55m | 4:54PM1.15m | 6:40AM0.62m | 6:28PM1.30m | ||||||||
 | |  | | |  |  | | | |  | | | | | | | | | |  | |
 | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 6:50 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — |
mm | — | — | — | — | — | 4 | 6 | 3 | 5 | 7 | 8 | 25 | 2 | 2 | 2 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 30 | 30 | 28 | 26 | 28 | 26 | 27 | 30 | 31 | 28 | 30 | 27 | 29 | 29 | 29 | 30 | 30 | 31 | 31 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 8 | SSW 8 | SSW 9 | S 8 | SSW 8 | SSW 8 | SW 12 | SSW 11 | SSW 11 | E 8 | E 8 | SW 11 | ENE 11 | S 11 | W 9 | SSW 10 | S 9 | S 9 | S 8 | SE 12 |
| kJ | 123 | 96 | 53 | 45 | 51 | 14 | 14 | 114 | 401 | 359 | 513 | 278 | 496 | 37 | 1107 | 153 | 342 | 169 | 122 | 68 | 227 |
Swell 2 Height (m) Direction Period (s) | E 12 | ENE 12 | ENE 11 | ENE 11 | WSW 9 | SW 9 | SW 10 | S 8 | E 14 | ENE 13 | SSW 11 | E 18 | ENE 11 | SW 11 | E 8 | ESE 7 | WNW 8 | WNW 7 | WNW 6 | NW 7 | NW 8 |
| kJ | 72 | 46 | 43 | 40 | 8 | 13 | 14 | 21 | 33 | 33 | 478 | 7 | 40 | 19 | 55 | 68 | 112 | 37 | 32 | 54 | 95 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | SW 9 | S 8 | — | S 8 | E 15 | E 15 | ENE 14 | E 16 | E 12 | — | E 17 | E 16 | W 10 | E 10 | E 7 | E 10 | E 10 | E 10 | S 8 |
| kJ | 4 | 4 | 13 | 12 | — | 5 | 18 | 17 | 37 | 5 | 11 | — | 6 | 5 | 67 | 50 | 34 | 53 | 68 | 68 | 63 |
Wind waves Height (m) Direction Period (s) | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 9 | ESE 8 | ESE 8 | ESE 9 | E 9 | ESE 8 | S 7 | S 10 | SE 7 | SSE 8 | SSW 11 | SSW 10 | — | — | — | — | — |
| kJ | 105 | 111 | 118 | 158 | 477 | 824 | 953 | 888 | 664 | 845 | 302 | 1087 | 429 | 785 | 1513 | 501 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 70 | 70 | 70 | 68 | 681 | 673 | 46 | 12 | 664 | 687 | 664 | 664 | 664 | 644 | 44 | 12 | 12 | 44 | 60 | 40 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Aha Rivermouth Surf forecast
The above surf forecast table for Aha Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Aha Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Aha Rivermouth 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 (Aha Rivermouth) 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 Aha Rivermouth 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.
Aha Rivermouth is 31 km (19 miles) from the city of Okinawa. If you plan a holiday in Okinawa, look for hotels and other accommodation in Okinawa. Okinawa has rooms for a wide range of budgets as well as car hire and transport links.
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