Surf Forecasts:
Aha Rivermouth surf forecast from 9 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 3PM (local time) - 3ft (0.9m), 12s period, ENE swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 6AM (local time) - 4.5ft (1.3m), 14s period, E swell with 665 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 3PM (local time) - 3ft (0.9m), 12s 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 Tuesday (Aug 11) at 3PM. The primary swell is predicted to be 0.9m and 12s 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 1.3m 14s and forecast to arrive on Monday (Aug 10) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 10s period and expected on Sunday (Aug 09) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 11th Aug) | 3ft (0.9m) 12s |
| Best Surf | 3PM (Tue 11th Aug) | 3ft (0.9m) 12s |
| Most Powerful | 6AM (Mon 10th Aug) | 4.5ft (1.3m) 14s |
Table - best surf conditions forecast for Aha Rivermouth over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I gotta be straight with you—this forecast for Aha Rivermouth is a tough one. We’re looking at a real battle with the wind across the whole 16-day window, and there’s hardly a moment where it all lines up for a proper surf. The water’s sitting at 86°, which is about average for the time of year.
We start off on Sunday, August 9th, with a risk of thunderstorms and a strong breeze from the SSE at 28 mph, swinging cross-off. Swell’s a tiny 4 ft from the east at 9 seconds, but with that wind, it’s just messy. The combined energy is weak (254), and the conditions are poor. Monday, August 10th, is a bit of a letdown too. The swell bumps up to 4 ft from the east, period stretching out to a nice 13 seconds (groundswell) and the energy jumps to moderate (609). But the wind is a cross-shore SE breeze at 16 mph, putting a chop on it. It’s a shame, because that longer period would usually mean better shaped waves, especially at a river mouth, but the wind ruins it. The next few days through to Thursday, August 14th, see the swell drop off and the wind stays unfriendly, mostly cross or cross-off with light breezes, but the wave heights slip below 3 ft and the energy drops under 150. It’s just poor.
There’s a real gap in quality here. From Friday, August 15th, right through to the end of the forecast on August 24th, it’s a long run of poor surf conditions. The swell tries to come back up around Wednesday, August 20th, with 5 ft from the east, and by Friday, August 22nd, we’re looking at a big 12 ft swell from the SE, with very strong energy (2055). But it’s all cross-on or onshore wind—gale-force stuff at times, hitting 34 mph. That’s not surf for anyone but experts, and even then, it’s blown out. The period drops to around 8-10 seconds, which is short-period, wind-affected junk. Honestly, for most of the second week, this setup looks more interesting for kite surfing than paddle surfing. Don’t hold your breath, but forecasts can change.
Laters, Rusty
Short Range ForecastHeavy rain (total 21mm), heaviest during Tue morning. Warm (max 29°C on Sun morning, min 28°C on Sun morning). Winds decreasing (strong winds from the SSE on Sun morning, light winds from the S by Tue night). | Days 4-6 Weather SummaryHeavy rain (total 32mm), heaviest during Wed afternoon. Warm (max 29°C on Wed afternoon, min 27°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 14 | E 13 | E 13 | E 12 | ENE 12 | ENE 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ESE 5 | ENE 9 | ENE 11 | ENE 11 | ENE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 212 | 165 | 306 | 609 | 427 | 314 | 240 | 254 | 193 | 135 | 130 | 77 | 86 | 86 | 56 | 38 | 13 | 28 | 65 | 66 | 116 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross | cross-on | cross | cross-on |
High Tide | 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 | 8:00AM2.13m | 8:34PM2.06m | ||||||||
Low Tide | 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 | 2:21PM0.30m | 2:37AM0.53m | |||||||
 | |  | |  | | |  | |  | | | | | | | | | |  | | |
 | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — |
 | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — |
mm | 3 | 3 | 6 | 1 | — | 3 | 4 | — | 1 | — | 4 | 7 | 7 | 6 | 1 | 3 | 3 | 1 | 1 | 8 | 5 |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 28 | 29 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 27 | 28 |
Feels °C | 28 | 28 | 28 | 31 | 31 | 31 | 32 | 32 | 34 | 32 | 32 | 32 | 32 | 33 | 32 | 32 | 30 | 30 | 30 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | WSW 12 | WSW 12 | SSW 10 | S 10 | S 10 | S 10 | SSW 10 | SSW 10 | S 10 | S 9 | S 9 | S 8 | SSW 9 | SSW 8 | S 8 | S 8 | S 8 | S 8 | ESE 5 | ENE 11 | ENE 10 |
| kJ | 774 | 1002 | 333 | 500 | 459 | 400 | 190 | 186 | 255 | 198 | 127 | 115 | 123 | 115 | 65 | 68 | 49 | 33 | 18 | 66 | 116 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 9 | W 11 | E 13 | E 13 | E 12 | S 11 | SSE 10 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ESE 5 | SW 9 | ENE 11 | S 8 | SSW 9 |
| kJ | 212 | 165 | 291 | 609 | 427 | 314 | 229 | 170 | 193 | 135 | 130 | 77 | 86 | 86 | 56 | 38 | 13 | 40 | 65 | 30 | 53 |
Swell 3 Height (m) Direction Period (s) | ENE 15 | ENE 14 | E 14 | SW 11 | SW 11 | SW 11 | ENE 12 | ENE 12 | SW 10 | E 5 | SW 9 | NE 12 | N 7 | N 7 | SW 9 | W 8 | W 7 | ENE 9 | SW 9 | SW 8 | S 8 |
| kJ | 42 | 70 | 306 | 233 | 191 | 142 | 240 | 254 | 45 | 9 | 23 | 37 | 17 | 15 | 26 | 21 | 26 | 28 | 37 | 35 | 19 |
Wind waves Height (m) Direction Period (s) | S 10 | S 10 | SSE 10 | — | — | E 6 | — | — | — | — | — | ESE 5 | — | — | ESE 4 | ESE 5 | — | ESE 5 | — | ESE 5 | ESE 6 |
| kJ | 1527 | 1493 | 717 | — | — | 41 | — | — | — | — | — | 5 | — | — | 6 | 12 | — | 17 | — | 19 | 34 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 683 | 683 | 595 | 12 | 12 | 12 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | 12 | 12 | 68 | 70 | 70 | 12 | 70 |
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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