Surf Forecasts:
Aha Rivermouth surf forecast from 8 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 3AM (local time) - 3ft (0.9m), 11s period, ENE swell with offshore winds.
- Most powerful swell: Monday 10 Aug, 3PM (local time) - 4.5ft (1.3m), 13s period, E swell with 591 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 3AM (local time) - 3ft (0.9m), 11s period with ENE 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 Wednesday (Aug 12) at 3AM. The primary swell is predicted to be 0.9m and 11s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Aha Rivermouth in the next 16 days are 1.3m 13s and forecast to arrive on Monday (Aug 10) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6.5m 12s period and expected on Saturday (Aug 08) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Wed 12th Aug) | 3ft (0.9m) 11s |
| Best Surf | 3AM (Wed 12th Aug) | 3ft (0.9m) 11s |
| Most Powerful | 3PM (Mon 10th Aug) | 4.5ft (1.3m) 13s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s talk about the surf ahead for Aha Rivermouth.
Right now, and for the next few days, it’s pretty grim. We’ve got a stretch that runs from the start all the way through to the end of the coming week where the surf is either poor or just ordinary. The wind is a big problem – mostly cross-off or cross-on, and often strong, with rain and storms mixed in. The swell is small and weak, so there’s nothing to get excited about.
The first real standout – and honestly, the only one worth pointing to – is Wednesday, 12 August. The morning shows a touch of hope with a 3ft swell from the ENE, and a period of 11 seconds, which is a nice groundswell. The real kicker is the wind: a light offshore from the SW, with a gentle breeze. That’ll give you clean, lined-up waves. The combined energy is moderate at 170, so it’s not pumping, but it’s surfable and the conditions will be tidy. The afternoon stays light with a cross-off breeze, and the waves drop a bit to 2ft. The water temperature is 86°, which is a touch warmer than normal for this time of year.
After that, the outlook fades. Thursday 13 August has a tiny 2ft swell and glassy conditions in the morning, but it’s barely a ripple. From Monday 17 August onward, the wind turns nasty – strong cross-on winds from the east, with swells building but becoming messy. By Thursday 20 August, the swell jumps to 13ft (ESE) with a huge combined energy of 2904, but the wind is strong cross-on and the conditions are described as messy. That’s not for paddling; that’s kite-surf territory at best. The period is short at 10 seconds, so it’s not going to be pretty.
The waves coming in the second week are bigger but ruined by onshore winds and poor surf quality. Friday 21 August still has a 10ft swell with strong cross-on wind, and the energy is still very strong at 1359, but it’s lumpy and not worth fighting for.
Overall, if you want a decent session, aim for Wednesday morning, 12 August. It’s the only time the stars align with a clean offshore wind and a long-period swell. Everything else is either too small, too windy, or too messy. The break is a beach/jetty setup, so it’s exposed, and crowds can show up sometimes, but on that Wednesday, with the conditions, it might be worth the paddle.
Stay patient, and check the charts again soon. This is a tough run.
Rusty.
Short Range ForecastHeavy rain (total 53mm), heaviest during Sat morning. Warm (max 29°C on Sat night, min 28°C on Sat morning). Winds decreasing (severe gales from the SSE on Sat morning, moderate winds from the SSE by Mon night). | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Thu night. Warm (max 30°C on Tue morning, min 28°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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) | ENE 11 | ENE 10 | E 10 | E 9 | ENE 9 | E 14 | E 13 | E 13 | E 12 | ENE 12 | ENE 12 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ESE 6 | ESE 6 | ESE 6 | ESE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 460 | 331 | 192 | 180 | 138 | 467 | 521 | 591 | 377 | 240 | 186 | 229 | 170 | 119 | 77 | 56 | 52 | 50 | 41 | 49 | 43 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross | glassy | on | cross-off | off | cross-off | cross |
High Tide | 4:10PM1.52m | 2:34AM1.74m | 5:16PM1.66m | 3:57AM1.83m | 6:00PM1.79m | 5:01AM1.95m | 6:35PM1.89m | 5:53AM2.06m | 7:07PM1.97m | 6:38AM2.14m | 7:37PM2.02m | 7:20AM2.16m | 8:06PM2.05m | ||||||||
Low Tide | 8:47PM1.28m | 10:05AM0.46m | 10:21PM1.21m | 11:06AM0.32m | 11:21PM1.08m | 11:55AM0.21m | 00:07AM0.93m | 12:36PM0.15m | 00:47AM0.79m | 1:14PM0.15m | 1:25AM0.67m | 1:49PM0.20m | 2:01AM0.58m | ||||||||
 | |  | | | | | | | |  | | | | | | | | | |  | |
 | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — |
 | — | 7:09 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — | — | 7:05 | — |
mm | 15 | 4 | 6 | 4 | 5 | 7 | 5 | 3 | 4 | 1 | — | 1 | 2 | 2 | 1 | 4 | 1 | 7 | 8 | 7 | 8 |
Temp °C | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 28 | 26 |
Feels °C | 19 | 21 | 24 | 28 | 27 | 27 | 30 | 30 | 31 | 33 | 33 | 32 | 34 | 34 | 33 | 34 | 34 | 34 | 33 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | ENE 10 | WSW 12 | WSW 13 | WSW 13 | W 12 | SW 11 | E 13 | S 10 | S 10 | S 10 | S 10 | S 9 | S 9 | S 9 | S 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | S 8 |
| kJ | 460 | 331 | 713 | 2318 | 1901 | 786 | 415 | 591 | 676 | 535 | 346 | 273 | 339 | 246 | 94 | 165 | 123 | 129 | 96 | 73 | 51 |
Swell 2 Height (m) Direction Period (s) | — | ENE 15 | E 10 | E 9 | ENE 9 | E 14 | W 11 | SW 11 | E 12 | ENE 12 | SSW 10 | ENE 11 | ENE 11 | ENE 11 | SSW 9 | ENE 10 | ENE 10 | ENE 10 | ESE 6 | ESE 6 | ENE 9 |
| kJ | — | 21 | 192 | 180 | 138 | 467 | 403 | 292 | 377 | 240 | 216 | 229 | 170 | 119 | 73 | 56 | 52 | 38 | 41 | 49 | 28 |
Swell 3 Height (m) Direction Period (s) | — | — | ENE 15 | ENE 15 | ENE 14 | — | E 13 | W 10 | W 10 | SW 11 | ENE 12 | SSW 10 | W 8 | N 8 | ENE 10 | W 8 | W 8 | W 7 | ENE 10 | ENE 10 | SW 8 |
| kJ | — | — | 21 | 42 | 70 | — | 521 | 216 | 165 | 145 | 186 | 133 | 32 | 6 | 77 | 10 | 11 | 9 | 38 | 31 | 18 |
Wind waves Height (m) Direction Period (s) | S 11 | S 12 | S 11 | S 9 | S 9 | S 10 | SSE 10 | S 11 | — | — | — | — | — | W 6 | — | — | E 6 | ESE 6 | — | — | ESE 6 |
| kJ | 9039 | 11190 | 5517 | 1444 | 1561 | 1712 | 800 | 776 | — | — | — | — | — | 30 | — | — | 7 | 50 | — | — | 43 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 926 | 801 | 693 | 687 | 683 | 664 | 673 | 664 | 595 | 595 | 696 | 595 | 0 | 0 | 12 | 0 | 68 | 0 | 0 | 0 | 12 |
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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