Surf Forecasts:
Aha Rivermouth surf forecast from 24 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 12PM (local time) - 18ft (5.5m), 16s period, E swell with cross-onshore winds.
- Most powerful swell: Tuesday 25 Aug, 12PM (local time) - 18ft (5.5m), 16s period, E swell with 15,922 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 12PM (local time) - 18ft (5.5m), 16s 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 (Aug 25) at 12PM. The primary swell is predicted to be 5.5m and 16s period. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 5.5m 16s and forecast to arrive on Tuesday (Aug 25) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6.5m 10s period and expected on Wednesday (Aug 26) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Tue 25th Aug) | 18ft (5.5m) 16s |
| Best Surf | 12PM (Tue 25th Aug) | 18ft (5.5m) 16s |
| Most Powerful | 12PM (Tue 25th Aug) | 18ft (5.5m) 16s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
Right, let’s talk surf. I’m not gonna sugarcoat it—this 16-day stretch is a lean one for this spot.
The first real chance of anything decent ain’t until Monday the 1st of September, and honestly, it’s a write-off. That morning sees a huge 26ft east-southeast swell with a 13-second period, but you got a near gale from the east smashing across it. Massive wave energy (22,080) but totally unrideable. The jetty break at Aha Rivermouth stays messy and blown out for days after that.
You gotta wait until Thursday the 3rd of September for a window. That morning, the wind swings offshore from the west-southwest at 22 mph, clean, with an 8ft northwest groundswell at 12 seconds. That’s good energy (2,118) and proper shape. Water temp is about what you’d expect for this time of year. The afternoon gets even better—lighter offshore breeze, 12 mph, with a 7ft northwest swell, super clean, and excellent for experienced surfers. That swell size is over 7ft, so it’s a bit much for learners, but for anyone who’s comfortable out there, that Thursday is the one to aim for.
Other than that, it’s small, onshore, or just plain messy for pretty much the whole run. There’s a big gap of several days with nothing worth a paddle before that Thursday. It’s a long-range call, so keep an eye on it, but that’s your best bet by a long shot.
Rusty.
Short Range ForecastHeavy rain (total 48mm), heaviest during Tue night. Warm (max 29°C on Tue morning, min 27°C on Tue night). Winds increasing (moderate winds from the NE on Mon night, stormy winds from the WNW by Tue night). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Thu night. Warm (max 29°C on Fri morning, min 28°C on Thu night). Mainly strong winds. | ||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 17 | E 16 | E 16 | NNW 10 | E 11 | E 9 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | SE 7 | SE 8 | SE 8 | E 13 | SE 8 | SE 7 | ESE 6 | ESE 6 | ESE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 4374 | 12385 | 15394 | 7005 | 196 | 106 | 58 | 55 | 52 | 47 | 618 | 769 | 432 | 89 | 375 | 155 | 97 | 112 | 384 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | on | on |
High Tide | 4:36AM1.64m | 6:20PM1.74m | 5:20AM1.76m | 6:39PM1.83m | 5:58AM1.87m | 6:59PM1.90m | 6:33AM1.97m | 7:20PM1.96m | 7:07AM2.05m | 7:43PM2.00m | 7:43AM2.08m | 8:08PM2.03m | |||||||
Low Tide | 11:23PM1.21m | 11:30AM0.52m | 11:53PM1.09m | 12:02PM0.43m | 00:18AM0.96m | 12:31PM0.36m | 00:44AM0.82m | 1:00PM0.33m | 1:11AM0.69m | 1:29PM0.34m | 1:40AM0.57m | 1:58PM0.39m | 2:12AM0.48m | ||||||
 |  |  |  | | | | |  | |  | | | | |  | | |  | |
 | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — |
 | 6:55 | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — |
mm | — | 1 | 7 | 25 | 7 | 4 | 3 | 1 | — | 2 | — | — | 4 | 1 | — | — | — | — | 1 |
Temp °C | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 30 | 27 | 22 | 15 | 23 | 25 | 24 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | E 17 | E 16 | E 16 | ENE 13 | WNW 10 | WNW 10 | W 11 | W 12 | W 12 | WSW 12 | WSW 12 | WSW 11 | SW 10 | SW 10 | SW 10 | SW 9 | SSW 9 | SSW 8 | SSW 8 |
| kJ | 4374 | 12385 | 15394 | 3827 | 1939 | 1201 | 1577 | 1794 | 1775 | 1272 | 559 | 320 | 76 | 64 | 80 | 71 | 119 | 75 | 41 |
Swell 2 Height (m) Direction Period (s) | ENE 10 | SW 9 | — | NNE 11 | E 11 | E 9 | E 8 | ENE 13 | ENE 12 | ENE 12 | SSW 9 | SW 9 | ENE 13 | E 13 | E 13 | E 12 | E 12 | ENE 12 | ENE 11 |
| kJ | 38 | 40 | — | 2507 | 196 | 106 | 49 | 55 | 52 | 47 | 52 | 43 | 59 | 89 | 85 | 108 | 72 | 46 | 43 |
Swell 3 Height (m) Direction Period (s) | — | — | — | ENE 16 | E 15 | ENE 14 | ENE 13 | E 18 | E 18 | ENE 16 | ENE 12 | ENE 15 | WSW 9 | W 8 | W 8 | SSW 9 | SE 10 | SW 9 | SW 9 |
| kJ | — | — | — | 950 | 17 | 37 | 58 | 6 | 6 | 25 | 28 | 42 | 29 | 6 | 6 | 29 | 4 | 14 | 14 |
Wind waves Height (m) Direction Period (s) | ENE 7 | NNE 6 | N 7 | NNW 10 | SW 9 | SSW 8 | S 8 | S 8 | SSE 7 | SE 6 | SE 7 | SE 8 | SE 8 | SE 9 | SE 8 | SE 7 | ESE 6 | ESE 6 | ESE 8 |
| kJ | 145 | 206 | 587 | 7005 | 3539 | 1346 | 940 | 728 | 432 | 269 | 618 | 769 | 432 | 711 | 375 | 155 | 97 | 112 | 384 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 40 | 595 | 673 | 673 | 673 | 673 | 673 | 683 | 685 | 627 | 640 | 673 | 70 | 70 | 933 | 70 | 68 | 746 | 621 |
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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